Separate core components in its own module

67 files changed, 7553 insertions, 0 deletions

diff --git a/core/src/main/kotlin/ca/allanwang/kau/about/AboutActivityBase.kt b/core/src/main/kotlin/ca/allanwang/kau/about/AboutActivityBase.kt
new file mode 100644
index 0000000..32e8745
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/about/AboutActivityBase.kt
@@ -0,0 +1,236 @@
+package ca.allanwang.kau.about
+
+import android.graphics.drawable.Drawable
+import android.os.Bundle
+import android.support.v4.view.PagerAdapter
+import android.support.v4.view.ViewPager
+import android.support.v7.app.AppCompatActivity
+import android.support.v7.widget.RecyclerView
+import android.transition.TransitionInflater
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import ca.allanwang.kau.R
+import ca.allanwang.kau.adapters.FastItemThemedAdapter
+import ca.allanwang.kau.adapters.ThemableIItemColors
+import ca.allanwang.kau.adapters.ThemableIItemColorsDelegate
+import ca.allanwang.kau.animators.FadeScaleAnimator
+import ca.allanwang.kau.iitems.CutoutIItem
+import ca.allanwang.kau.iitems.HeaderIItem
+import ca.allanwang.kau.iitems.LibraryIItem
+import ca.allanwang.kau.utils.*
+import ca.allanwang.kau.widgets.ElasticDragDismissFrameLayout
+import ca.allanwang.kau.widgets.InkPageIndicator
+import com.mikepenz.aboutlibraries.Libs
+import com.mikepenz.aboutlibraries.entity.Library
+import com.mikepenz.fastadapter.IItem
+import org.jetbrains.anko.doAsync
+import org.jetbrains.anko.uiThread
+import java.security.InvalidParameterException
+
+/**
+ * Created by Allan Wang on 2017-06-28.
+ *
+ * Floating About Activity Panel for your app
+ * This contains all the necessary layouts, and can be extended and configured using the [configBuilder]
+ * The [rClass] is necessary to generate the list of libraries used in your app, and should point to your app's
+ * R.string::class.java
+ * Note that for the auto detection to work, the R fields must be excluded from Proguard
+ * Manual lib listings and other extra modifications can be done so by overriding the open functions
+ */
+abstract class AboutActivityBase(val rClass: Class<*>, val configBuilder: Configs.() -> Unit = {}) : AppCompatActivity(), ViewPager.OnPageChangeListener {
+
+    val draggableFrame: ElasticDragDismissFrameLayout by bindView(R.id.about_draggable_frame)
+    val pager: ViewPager by bindView(R.id.about_pager)
+    val indicator: InkPageIndicator by bindView(R.id.about_indicator)
+    /**
+     * Holds some common configurations that may be added directly from the constructor
+     * Applied lazily since it needs the context to fetch resources
+     */
+    val configs: Configs by lazy { Configs().apply { configBuilder() } }
+    /**
+     * Number of pages in the adapter
+     * Defaults to just the main view and lib view
+     */
+    open val pageCount: Int = 2
+    /**
+     * Page position for the libs
+     * This is generated automatically if [inflateLibPage] is called
+     */
+    private var libPage: Int = -2
+    /**
+     * Holds that status of each page
+     * 0 means nothing has happened
+     * 1 means this page has been in view at least once
+     * The rest is up to you
+     */
+    lateinit var pageStatus: IntArray
+    /**
+     * Holds the lib items once they are fetched asynchronously
+     */
+    var libItems: List<LibraryIItem>? = null
+    /**
+     * Holds the adapter for the library page; this is generated later because it uses the config colors
+     */
+    lateinit var libAdapter: FastItemThemedAdapter<IItem<*, *>>
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.kau_activity_about)
+        pageStatus = IntArray(pageCount)
+        libAdapter = FastItemThemedAdapter(configs)
+        LibraryIItem.bindClickEvents(libAdapter)
+        if (configs.textColor != null) indicator.setColour(configs.textColor!!)
+        with(pager) {
+            adapter = AboutPagerAdapter()
+            pageMargin = dimenPixelSize(R.dimen.kau_spacing_normal)
+            addOnPageChangeListener(this@AboutActivityBase)
+        }
+        indicator.setViewPager(pager)
+        draggableFrame.addListener(object : ElasticDragDismissFrameLayout.SystemChromeFader(this) {
+            override fun onDragDismissed() {
+                // if we drag dismiss downward then the default reversal of the enter
+                // transition would slide content upward which looks weird. So reverse it.
+                if (draggableFrame.translationY > 0) {
+                    window.returnTransition = TransitionInflater.from(this@AboutActivityBase)
+                            .inflateTransition(configs.transitionExitReversed)
+                }
+                finishAfterTransition()
+            }
+        })
+    }
+
+    inner class Configs : ThemableIItemColors by ThemableIItemColorsDelegate() {
+        var cutoutTextRes: Int = -1
+        var cutoutText: String? = null
+        var cutoutDrawableRes: Int = -1
+        var cutoutDrawable: Drawable? = null
+        var cutoutForeground: Int? = null
+        var libPageTitleRes: Int = -1
+        var libPageTitle: String? = string(R.string.kau_about_libraries_intro) //This is in the string by default since it's lower priority
+        /**
+         * Transition to be called if the view is dragged down
+         */
+        var transitionExitReversed: Int = R.transition.kau_about_return_downward
+    }
+
+    /**
+     * Method to fetch the library list
+     * This is fetched asynchronously and you may override it to customize the list
+     */
+    open fun getLibraries(libs: Libs): List<Library> = libs.prepareLibraries(this, null, null, true, true)
+
+    /**
+     * Gets the view associated with the given page position
+     * Keep in mind that when inflating, do NOT add the view to the viewgroup
+     * Use layoutInflater.inflate(id, parent, false)
+     */
+    open fun getPage(position: Int, layoutInflater: LayoutInflater, parent: ViewGroup): View {
+        return when (position) {
+            0 -> inflateMainPage(layoutInflater, parent, position)
+            pageCount - 1 -> inflateLibPage(layoutInflater, parent, position)
+            else -> throw InvalidParameterException()
+        }
+    }
+
+    /**
+     * Create the main view with the cutout
+     */
+    open fun inflateMainPage(layoutInflater: LayoutInflater, parent: ViewGroup, position: Int): View {
+        val fastAdapter = FastItemThemedAdapter<IItem<*, *>>(configs)
+        val recycler = fullLinearRecycler(fastAdapter)
+        fastAdapter.add(CutoutIItem {
+            with(configs) {
+                text = string(cutoutTextRes, cutoutText)
+                drawable = drawable(cutoutDrawableRes, cutoutDrawable)
+                if (configs.cutoutForeground != null) foregroundColor = configs.cutoutForeground!!
+            }
+        }.apply {
+            themeEnabled = configs.cutoutForeground == null
+        })
+        postInflateMainPage(fastAdapter)
+        return recycler
+    }
+
+    /**
+     * Open hook called just before the main page view is returned
+     * Feel free to add your own items to the adapter in here
+     */
+    open fun postInflateMainPage(adapter: FastItemThemedAdapter<IItem<*, *>>) {
+
+    }
+
+    /**
+     * Create the lib view with the list of libraries
+     */
+    open fun inflateLibPage(layoutInflater: LayoutInflater, parent: ViewGroup, position: Int): View {
+        libPage = position
+        val v = layoutInflater.inflate(R.layout.kau_recycler_detached_background, parent, false)
+        val recycler = v.findViewById<RecyclerView>(R.id.kau_recycler_detached)
+        recycler.adapter = libAdapter
+        recycler.itemAnimator = FadeScaleAnimator(itemDelayFactor = 0.2f).apply { addDuration = 300; interpolator = AnimHolder.decelerateInterpolator(this@AboutActivityBase) }
+        val background = v.findViewById<View>(R.id.kau_recycler_detached_background)
+        if (configs.backgroundColor != null) background.setBackgroundColor(configs.backgroundColor!!.colorToForeground())
+        doAsync {
+            libItems = getLibraries(Libs(this@AboutActivityBase, Libs.toStringArray(rClass.fields))).map { LibraryIItem(it) }
+            if (libPage >= 0 && pageStatus[libPage] == 1)
+                uiThread { addLibItems() }
+        }
+        return v
+    }
+
+    inner class AboutPagerAdapter : PagerAdapter() {
+
+        private val layoutInflater: LayoutInflater = LayoutInflater.from(this@AboutActivityBase)
+        private val views = Array<View?>(pageCount) { null }
+
+        override fun instantiateItem(collection: ViewGroup, position: Int): Any {
+            val layout = getPage(position, collection)
+            collection.addView(layout)
+            return layout
+        }
+
+        override fun destroyItem(collection: ViewGroup, position: Int, view: Any) {
+            collection.removeView(view as View)
+            views[position] = null
+        }
+
+        override fun getCount(): Int = pageCount
+
+        override fun isViewFromObject(view: View, `object`: Any): Boolean = view === `object`
+
+        /**
+         * Only get page if view does not exist
+         */
+        private fun getPage(position: Int, parent: ViewGroup): View {
+            if (views[position] == null) views[position] = getPage(position, layoutInflater, parent)
+            return views[position]!!
+        }
+    }
+
+    override fun onPageScrollStateChanged(state: Int) {}
+
+    override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {}
+
+    override fun onPageSelected(position: Int) {
+        if (pageStatus[position] == 0) pageStatus[position] = 1 // mark as seen if previously null
+        if (position == libPage && libItems != null && pageStatus[position] == 1) {
+            pageStatus[position] = 2            //add libs and mark as such
+            postDelayed(300) { addLibItems() }  //delay so that the animations occur once the page is fully switched
+        }
+    }
+
+    /**
+     * Function that is called when the view is ready to add the lib items
+     * Feel free to add your own items here
+     */
+    open fun addLibItems() {
+        libAdapter.add(HeaderIItem(text = configs.libPageTitle, textRes = configs.libPageTitleRes))
+                .add(libItems)
+    }
+
+    override fun onDestroy() {
+        AnimHolder.decelerateInterpolator.invalidate() //clear the reference to the interpolators we've used
+        super.onDestroy()
+    }
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/adapters/ChainedAdapters.kt b/core/src/main/kotlin/ca/allanwang/kau/adapters/ChainedAdapters.kt
new file mode 100644
index 0000000..e1c5c18
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/adapters/ChainedAdapters.kt
@@ -0,0 +1,85 @@
+package ca.allanwang.kau.adapters
+
+import android.support.v7.widget.LinearLayoutManager
+import android.support.v7.widget.RecyclerView
+import com.mikepenz.fastadapter.IItem
+import com.mikepenz.fastadapter.adapters.HeaderAdapter
+import com.mikepenz.fastadapter.commons.adapters.FastItemAdapter
+import org.jetbrains.anko.collections.forEachReversedWithIndex
+import java.util.*
+
+/**
+ * Created by Allan Wang on 2017-06-27.
+ *
+ * Once bounded to a [RecyclerView], this will
+ * - Chain together a list of [HeaderAdapter]s, backed by a generic [FastItemAdapter]
+ * - Add a [LinearLayoutManager] to the recycler
+ * - Add a listener for when a new adapter segment is being used
+ */
+class ChainedAdapters<T>(vararg items: Pair<T, SectionAdapter<*>>) {
+    private val chain: MutableList<Pair<T, SectionAdapter<*>>> = mutableListOf(*items)
+    val baseAdapter: FastItemAdapter<IItem<*, *>> = FastItemAdapter()
+    private val indexStack = Stack<Int>()
+    var recycler: RecyclerView? = null
+    val firstVisibleItemPosition: Int
+        get() = (recycler?.layoutManager as LinearLayoutManager?)?.findFirstVisibleItemPosition() ?: throw IllegalArgumentException("No recyclerview was bounded to the chain adapters")
+
+    fun add(vararg items: Pair<T, SectionAdapter<*>>) = add(items.toList())
+
+    fun add(items: Collection<Pair<T, SectionAdapter<*>>>): ChainedAdapters<T> {
+        if (recycler != null) throw IllegalAccessException("Chain adapter is already bounded to a recycler; cannot add directly.")
+        items.map { it.second }.forEachIndexed { index, sectionAdapter -> sectionAdapter.sectionOrder = chain.size + 1 + index }
+        chain.addAll(items)
+        return this
+    }
+
+    operator fun get(index: Int) = chain[index]
+
+    /**
+     * Attaches the chain to a recycler
+     * After this stage, any modifications to the adapters must be done through external references
+     * You may still get the generic header adapters through the get operator
+     * Binding the recycler also involves supplying a callback, which returns
+     * the item (T) associated with the adapter,
+     * the index (Int) of the current adapter
+     * and the dy (Int) as given by the scroll listener
+     */
+    fun bindRecyclerView(recyclerView: RecyclerView, onAdapterSectionChanged: (item: T, index: Int, dy: Int) -> Unit) {
+        if (recycler != null) throw IllegalStateException("Chain adapter is already bounded")
+        if (chain.isEmpty()) throw IllegalArgumentException("No adapters have been added to the adapters list")
+        //wrap adapters
+        chain.map { it.second }.forEachReversedWithIndex { i, headerAdapter ->
+            if (i == chain.size - 1) headerAdapter.wrap(baseAdapter)
+            else headerAdapter.wrap(chain[i + 1].second)
+        }
+        recycler = recyclerView
+        indexStack.push(0)
+        with(recyclerView) {
+            layoutManager = LinearLayoutManager(context)
+            adapter = chain.first().second
+            addOnScrollListener(object : RecyclerView.OnScrollListener() {
+                override fun onScrolled(rv: RecyclerView, dx: Int, dy: Int) {
+                    super.onScrolled(rv, dx, dy)
+                    val topPosition = firstVisibleItemPosition
+                    val currentAdapterIndex = indexStack.peek()
+                    if (dy > 0) {
+                        //look ahead from current adapter
+                        val nextAdapterIndex = (currentAdapterIndex until chain.size).asSequence()
+                                .firstOrNull {
+                                    val adapter = chain[it].second
+                                    adapter.adapterItemCount > 0 && adapter.getGlobalPosition(adapter.adapterItemCount - 1) >= topPosition
+                                } ?: currentAdapterIndex
+                        if (nextAdapterIndex == currentAdapterIndex) return
+                        indexStack.push(nextAdapterIndex)
+                        onAdapterSectionChanged(chain[indexStack.peek()].first, indexStack.peek(), dy)
+                    } else if (currentAdapterIndex == 0) {
+                        return //All adapters may be empty; in this case, if we are already at the beginning, don't bother checking
+                    } else if (chain[currentAdapterIndex].second.getGlobalPosition(0) > topPosition) {
+                        indexStack.pop()
+                        onAdapterSectionChanged(chain[indexStack.peek()].first, indexStack.peek(), dy)
+                    }
+                }
+            })
+        }
+    }
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/adapters/FastItemThemedAdapter.kt b/core/src/main/kotlin/ca/allanwang/kau/adapters/FastItemThemedAdapter.kt
new file mode 100644
index 0000000..66fec4b
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/adapters/FastItemThemedAdapter.kt
@@ -0,0 +1,189 @@
+package ca.allanwang.kau.adapters
+
+import android.content.res.ColorStateList
+import android.view.View
+import android.widget.ImageView
+import android.widget.TextView
+import ca.allanwang.kau.utils.adjustAlpha
+import ca.allanwang.kau.views.createSimpleRippleDrawable
+import com.mikepenz.fastadapter.IExpandable
+import com.mikepenz.fastadapter.IItem
+import com.mikepenz.fastadapter.ISubItem
+import com.mikepenz.fastadapter.commons.adapters.FastItemAdapter
+
+/**
+ * Created by Allan Wang on 2017-06-29.
+ *
+ * Adapter with a set of colors that will be added to all subsequent items
+ * Changing a color while the adapter is not empty will reload all items
+ *
+ * This adapter overrides every method where an item is added
+ * If that item extends [ThemableIItem], then the colors will be set
+ */
+class FastItemThemedAdapter<Item : IItem<*, *>>(
+        textColor: Int? = null,
+        backgroundColor: Int? = null,
+        accentColor: Int? = null
+) : FastItemAdapter<Item>() {
+    constructor(colors: ThemableIItemColors) : this(colors.textColor, colors.backgroundColor, colors.accentColor)
+
+    var textColor: Int? = textColor
+        set(value) {
+            if (field == value) return
+            field = value
+            themeChanged()
+        }
+    var backgroundColor: Int? = backgroundColor
+        set(value) {
+            if (field == value) return
+            field = value
+            themeChanged()
+        }
+    var accentColor: Int? = accentColor
+        set(value) {
+            if (field == value) return
+            field = value
+            themeChanged()
+        }
+
+    fun setColors(colors: ThemableIItemColors) {
+        this.textColor = colors.textColor
+        this.backgroundColor = colors.backgroundColor
+        this.accentColor = colors.accentColor
+    }
+
+    fun themeChanged() {
+        if (adapterItemCount == 0) return
+        injectTheme(adapterItems)
+        notifyAdapterDataSetChanged()
+    }
+
+    override fun add(position: Int, items: MutableList<Item>): FastItemAdapter<Item> {
+        injectTheme(items)
+        return super.add(position, items)
+    }
+
+    override fun add(position: Int, item: Item): FastItemAdapter<Item> {
+        injectTheme(item)
+        return super.add(position, item)
+    }
+
+    override fun add(item: Item): FastItemAdapter<Item> {
+        injectTheme(item)
+        return super.add(item)
+    }
+
+    override fun add(items: MutableList<Item>): FastItemAdapter<Item> {
+        injectTheme(items)
+        injectTheme(items)
+        return super.add(items)
+    }
+
+    override fun set(items: MutableList<Item>?): FastItemAdapter<Item> {
+        injectTheme(items)
+        return super.set(items)
+    }
+
+    override fun set(position: Int, item: Item): FastItemAdapter<Item> {
+        injectTheme(item)
+        return super.set(position, item)
+    }
+
+    override fun setNewList(items: MutableList<Item>?, retainFilter: Boolean): FastItemAdapter<Item> {
+        injectTheme(items)
+        return super.setNewList(items, retainFilter)
+    }
+
+    override fun setNewList(items: MutableList<Item>?): FastItemAdapter<Item> {
+        injectTheme(items)
+        return super.setNewList(items)
+    }
+
+    override fun <T, S> setSubItems(collapsible: T, subItems: MutableList<S>?): T where S : IItem<*, *>?, T : IItem<*, *>?, T : IExpandable<T, S>?, S : ISubItem<Item, T>? {
+        injectTheme(subItems)
+        return super.setSubItems(collapsible, subItems)
+    }
+
+    internal fun injectTheme(items: Collection<IItem<*, *>?>?) {
+        items?.forEach { injectTheme(it) }
+    }
+
+    internal fun injectTheme(item: IItem<*, *>?) {
+        if (item is ThemableIItem && item.themeEnabled) {
+            item.textColor = textColor
+            item.backgroundColor = backgroundColor
+            item.accentColor = accentColor
+        }
+    }
+}
+
+interface ThemableIItemColors {
+    var textColor: Int?
+    var backgroundColor: Int?
+    var accentColor: Int?
+}
+
+class ThemableIItemColorsDelegate : ThemableIItemColors {
+    override var textColor: Int? = null
+    override var backgroundColor: Int? = null
+    override var accentColor: Int? = null
+}
+
+/**
+ * Interface that needs to be implemented by every iitem
+ * Holds the color values and has helper methods to inject the colors
+ */
+interface ThemableIItem : ThemableIItemColors {
+    var themeEnabled: Boolean
+    fun bindTextColor(vararg views: TextView?)
+    fun bindTextColorSecondary(vararg views: TextView?)
+    fun bindDividerColor(vararg views: View?)
+    fun bindAccentColor(vararg views: TextView?)
+    fun bindBackgroundColor(vararg views: View?)
+    fun bindBackgroundRipple(vararg views: View?)
+    fun bindIconColor(vararg views: ImageView?)
+}
+
+/**
+ * The delegate for [ThemableIItem]
+ */
+class ThemableIItemDelegate : ThemableIItem, ThemableIItemColors by ThemableIItemColorsDelegate() {
+    override var themeEnabled: Boolean = true
+
+    override fun bindTextColor(vararg views: TextView?) {
+        val color = textColor ?: return
+        views.forEach { it?.setTextColor(color) }
+    }
+
+    override fun bindTextColorSecondary(vararg views: TextView?) {
+        val color = textColor?.adjustAlpha(0.8f) ?: return
+        views.forEach { it?.setTextColor(color) }
+    }
+
+    override fun bindAccentColor(vararg views: TextView?) {
+        val color = accentColor ?: textColor ?: return
+        views.forEach { it?.setTextColor(color) }
+    }
+
+    override fun bindDividerColor(vararg views: View?) {
+        val color = (textColor ?: accentColor)?.adjustAlpha(0.1f) ?: return
+        views.forEach { it?.setBackgroundColor(color) }
+    }
+
+    override fun bindBackgroundColor(vararg views: View?) {
+        val color = backgroundColor ?: return
+        views.forEach { it?.setBackgroundColor(color) }
+    }
+
+    override fun bindBackgroundRipple(vararg views: View?) {
+        val foreground = accentColor ?: textColor ?: return
+        val background = backgroundColor ?: return
+        val ripple = createSimpleRippleDrawable(foreground, background)
+        views.forEach { it?.background = ripple }
+    }
+
+    override fun bindIconColor(vararg views: ImageView?) {
+        val color = accentColor ?: textColor ?: return
+        views.forEach { it?.drawable?.setTintList(ColorStateList.valueOf(color)) }
+    }
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/adapters/SectionAdapter.kt b/core/src/main/kotlin/ca/allanwang/kau/adapters/SectionAdapter.kt
new file mode 100644
index 0000000..cf7205a
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/adapters/SectionAdapter.kt
@@ -0,0 +1,13 @@
+package ca.allanwang.kau.adapters
+
+import com.mikepenz.fastadapter.IItem
+import com.mikepenz.fastadapter.adapters.HeaderAdapter
+
+/**
+ * Created by Allan Wang on 2017-06-27.
+ *
+ * Extension of [HeaderAdapter] where we can define the order
+ */
+class SectionAdapter<Item : IItem<*, *>>(var sectionOrder: Int = 100) : HeaderAdapter<Item>() {
+    override fun getOrder(): Int = sectionOrder
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/animators/BaseDelayAnimator.kt b/core/src/main/kotlin/ca/allanwang/kau/animators/BaseDelayAnimator.kt
new file mode 100644
index 0000000..c649376
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/animators/BaseDelayAnimator.kt
@@ -0,0 +1,45 @@
+package ca.allanwang.kau.animators
+
+import android.support.v7.widget.RecyclerView
+import android.view.ViewPropertyAnimator
+
+/**
+ * Created by Allan Wang on 2017-06-27.
+ *
+ * Base for delayed animators
+ * item delay factor by default can be 0.125f
+ */
+abstract class BaseDelayAnimator(val itemDelayFactor: Float) : DefaultAnimator() {
+
+    override abstract fun addAnimationPrepare(holder: RecyclerView.ViewHolder)
+
+    override fun addAnimation(holder: RecyclerView.ViewHolder): ViewPropertyAnimator {
+        return holder.itemView.animate().apply {
+            startDelay = Math.max(0L, (holder.adapterPosition * addDuration * itemDelayFactor).toLong())
+            duration = this@BaseDelayAnimator.addDuration
+            interpolator = this@BaseDelayAnimator.interpolator
+        }
+    }
+
+
+    override abstract fun addAnimationCleanup(holder: RecyclerView.ViewHolder)
+
+    override fun getAddDelay(remove: Long, move: Long, change: Long): Long = 0
+
+    override fun getRemoveDelay(remove: Long, move: Long, change: Long): Long = 0
+
+    /**
+     * Partial removal animation
+     * As of now, all it does it change the alpha
+     * To have it slide, add onto it in a sub class
+     */
+    override fun removeAnimation(holder: RecyclerView.ViewHolder): ViewPropertyAnimator {
+        return holder.itemView.animate().apply {
+            duration = this@BaseDelayAnimator.removeDuration
+            startDelay = Math.max(0L, (holder.adapterPosition * removeDuration * itemDelayFactor).toLong())
+            interpolator = this@BaseDelayAnimator.interpolator
+        }
+    }
+
+    override abstract fun removeAnimationCleanup(holder: RecyclerView.ViewHolder)
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/animators/BaseItemAnimator.java b/core/src/main/kotlin/ca/allanwang/kau/animators/BaseItemAnimator.java
new file mode 100644
index 0000000..69c2cf3
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/animators/BaseItemAnimator.java
@@ -0,0 +1,764 @@
+package ca.allanwang.kau.animators;
+
+/*
+ * Created by Allan Wang on 2017-06-27.
+ *
+ * Based on Item Animator by {@author Mike Penz}
+ * Rewritten to match with the updated compat dependencies
+ */
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.TimeInterpolator;
+import android.animation.ValueAnimator;
+import android.support.annotation.NonNull;
+import android.support.v4.view.ViewCompat;
+import android.support.v7.widget.RecyclerView.ViewHolder;
+import android.support.v7.widget.SimpleItemAnimator;
+import android.view.View;
+import android.view.ViewPropertyAnimator;
+import android.view.animation.Interpolator;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * This implementation of {@link android.support.v7.widget.RecyclerView.ItemAnimator} provides basic
+ * animations on remove, add, and move events that happen to the items in
+ * a RecyclerView. RecyclerView uses a DefaultItemAnimator by default.
+ *
+ * @see android.support.v7.widget.RecyclerView#setItemAnimator(android.support.v7.widget.RecyclerView.ItemAnimator)
+ */
+public abstract class BaseItemAnimator extends SimpleItemAnimator {
+    private static final boolean DEBUG = false;
+
+    private static TimeInterpolator sDefaultInterpolator;
+
+    private ArrayList<ViewHolder> mPendingRemovals = new ArrayList<>();
+    private ArrayList<ViewHolder> mPendingAdditions = new ArrayList<>();
+    private ArrayList<MoveInfo> mPendingMoves = new ArrayList<>();
+    private ArrayList<ChangeInfo> mPendingChanges = new ArrayList<>();
+
+    ArrayList<ArrayList<ViewHolder>> mAdditionsList = new ArrayList<>();
+    ArrayList<ArrayList<MoveInfo>> mMovesList = new ArrayList<>();
+    ArrayList<ArrayList<ChangeInfo>> mChangesList = new ArrayList<>();
+
+    ArrayList<ViewHolder> mAddAnimations = new ArrayList<>();
+    ArrayList<ViewHolder> mMoveAnimations = new ArrayList<>();
+    ArrayList<ViewHolder> mRemoveAnimations = new ArrayList<>();
+    ArrayList<ViewHolder> mChangeAnimations = new ArrayList<>();
+
+    public Interpolator interpolator;
+
+    private static class MoveInfo {
+        public ViewHolder holder;
+        public int fromX, fromY, toX, toY;
+
+        MoveInfo(ViewHolder holder, int fromX, int fromY, int toX, int toY) {
+            this.holder = holder;
+            this.fromX = fromX;
+            this.fromY = fromY;
+            this.toX = toX;
+            this.toY = toY;
+        }
+    }
+
+    public static class ChangeInfo {
+        public ViewHolder oldHolder, newHolder;
+        public int fromX, fromY, toX, toY;
+
+        private ChangeInfo(ViewHolder oldHolder, ViewHolder newHolder) {
+            this.oldHolder = oldHolder;
+            this.newHolder = newHolder;
+        }
+
+        ChangeInfo(ViewHolder oldHolder, ViewHolder newHolder,
+                   int fromX, int fromY, int toX, int toY) {
+            this(oldHolder, newHolder);
+            this.fromX = fromX;
+            this.fromY = fromY;
+            this.toX = toX;
+            this.toY = toY;
+        }
+
+        @Override
+        public String toString() {
+            return "ChangeInfo{"
+                    + "oldHolder=" + oldHolder
+                    + ", newHolder=" + newHolder
+                    + ", fromX=" + fromX
+                    + ", fromY=" + fromY
+                    + ", toX=" + toX
+                    + ", toY=" + toY
+                    + '}';
+        }
+    }
+
+    @Override
+    public void runPendingAnimations() {
+        boolean removalsPending = !mPendingRemovals.isEmpty();
+        boolean movesPending = !mPendingMoves.isEmpty();
+        boolean changesPending = !mPendingChanges.isEmpty();
+        boolean additionsPending = !mPendingAdditions.isEmpty();
+        if (!removalsPending && !movesPending && !additionsPending && !changesPending) {
+            // nothing to animate
+            return;
+        }
+        // First, remove stuff
+        for (ViewHolder holder : mPendingRemovals) {
+            animateRemoveImpl(holder);
+        }
+        mPendingRemovals.clear();
+        // Next, move stuff
+        if (movesPending) {
+            final ArrayList<MoveInfo> moves = new ArrayList<>();
+            moves.addAll(mPendingMoves);
+            mMovesList.add(moves);
+            mPendingMoves.clear();
+            Runnable mover = new Runnable() {
+                @Override
+                public void run() {
+                    for (MoveInfo moveInfo : moves) {
+                        animateMoveImpl(moveInfo.holder, moveInfo.fromX, moveInfo.fromY,
+                                moveInfo.toX, moveInfo.toY);
+                    }
+                    moves.clear();
+                    mMovesList.remove(moves);
+                }
+            };
+            if (removalsPending) {
+                View view = moves.get(0).holder.itemView;
+                ViewCompat.postOnAnimationDelayed(view, mover, 0);
+            } else {
+                mover.run();
+            }
+        }
+        // Next, change stuff, to run in parallel with move animations
+        if (changesPending) {
+            final ArrayList<ChangeInfo> changes = new ArrayList<>();
+            changes.addAll(mPendingChanges);
+            mChangesList.add(changes);
+            mPendingChanges.clear();
+            Runnable changer = new Runnable() {
+                @Override
+                public void run() {
+                    for (ChangeInfo change : changes) {
+                        animateChangeImpl(change);
+                    }
+                    changes.clear();
+                    mChangesList.remove(changes);
+                }
+            };
+            if (removalsPending) {
+                ViewHolder holder = changes.get(0).oldHolder;
+                long moveDuration = movesPending ? getMoveDuration() : 0;
+                ViewCompat.postOnAnimationDelayed(holder.itemView, changer, getRemoveDelay(getRemoveDuration(), moveDuration, getChangeDuration()));
+            } else {
+                changer.run();
+            }
+        }
+        // Next, add stuff
+        if (additionsPending) {
+            final ArrayList<ViewHolder> additions = new ArrayList<>();
+            additions.addAll(mPendingAdditions);
+            mAdditionsList.add(additions);
+            mPendingAdditions.clear();
+            Runnable adder = new Runnable() {
+                @Override
+                public void run() {
+                    for (ViewHolder holder : additions) {
+                        animateAddImpl(holder);
+                    }
+                    additions.clear();
+                    mAdditionsList.remove(additions);
+                }
+            };
+            if (removalsPending || movesPending || changesPending) {
+                long removeDuration = removalsPending ? getRemoveDuration() : 0;
+                long moveDuration = movesPending ? getMoveDuration() : 0;
+                long changeDuration = changesPending ? getChangeDuration() : 0;
+                View view = additions.get(0).itemView;
+                ViewCompat.postOnAnimationDelayed(view, adder, getAddDelay(removeDuration, moveDuration, changeDuration));
+            } else {
+                adder.run();
+            }
+        }
+    }
+
+    /**
+     * used to calculated the delay until the remove animation should start
+     *
+     * @param remove the remove duration
+     * @param move   the move duration
+     * @param change the change duration
+     * @return the calculated delay for the remove items animation
+     */
+    public long getRemoveDelay(long remove, long move, long change) {
+        return remove + Math.max(move, change);
+    }
+
+    /**
+     * used to calculated the delay until the add animation should start
+     *
+     * @param remove the remove duration
+     * @param move   the move duration
+     * @param change the change duration
+     * @return the calculated delay for the add items animation
+     */
+    public long getAddDelay(long remove, long move, long change) {
+        return remove + Math.max(move, change);
+    }
+
+    @Override
+    public boolean animateRemove(final ViewHolder holder) {
+        resetAnimation(holder);
+        mPendingRemovals.add(holder);
+        return true;
+    }
+
+    private void animateRemoveImpl(final ViewHolder holder) {
+        final ViewPropertyAnimator animation = removeAnimation(holder);
+        mRemoveAnimations.add(holder);
+        animation.setListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationStart(Animator animator) {
+                dispatchRemoveStarting(holder);
+            }
+
+            @Override
+            public void onAnimationEnd(Animator animator) {
+                animation.setListener(null);
+                removeAnimationCleanup(holder);
+                dispatchRemoveFinished(holder);
+                mRemoveAnimations.remove(holder);
+                dispatchFinishedWhenDone();
+            }
+        }).start();
+    }
+
+    abstract public ViewPropertyAnimator removeAnimation(ViewHolder holder);
+
+    abstract public void removeAnimationCleanup(ViewHolder holder);
+
+    @Override
+    public boolean animateAdd(final ViewHolder holder) {
+        resetAnimation(holder);
+        addAnimationPrepare(holder);
+        mPendingAdditions.add(holder);
+        return true;
+    }
+
+    void animateAddImpl(final ViewHolder holder) {
+        final ViewPropertyAnimator animation = addAnimation(holder);
+        mAddAnimations.add(holder);
+        animation.setListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationStart(Animator animator) {
+                dispatchAddStarting(holder);
+            }
+
+            @Override
+            public void onAnimationCancel(Animator animator) {
+                addAnimationCleanup(holder);
+            }
+
+            @Override
+            public void onAnimationEnd(Animator animator) {
+                animation.setListener(null);
+                dispatchAddFinished(holder);
+                mAddAnimations.remove(holder);
+                dispatchFinishedWhenDone();
+                addAnimationCleanup(holder);
+            }
+        }).start();
+    }
+
+    /**
+     * the animation to prepare the view before the add animation is run
+     *
+     * @param holder
+     */
+    public abstract void addAnimationPrepare(ViewHolder holder);
+
+    /**
+     * the animation for adding a view
+     *
+     * @param holder
+     * @return
+     */
+    public abstract ViewPropertyAnimator addAnimation(ViewHolder holder);
+
+    /**
+     * the cleanup method if the animation needs to be stopped. and tro prepare for the next view
+     *
+     * @param holder
+     */
+    abstract void addAnimationCleanup(ViewHolder holder);
+
+    @Override
+    public boolean animateMove(final ViewHolder holder, int fromX, int fromY,
+                               int toX, int toY) {
+        final View view = holder.itemView;
+        fromX += (int) holder.itemView.getTranslationX();
+        fromY += (int) holder.itemView.getTranslationY();
+        resetAnimation(holder);
+        int deltaX = toX - fromX;
+        int deltaY = toY - fromY;
+        if (deltaX == 0 && deltaY == 0) {
+            dispatchMoveFinished(holder);
+            return false;
+        }
+        if (deltaX != 0) {
+            view.setTranslationX(-deltaX);
+        }
+        if (deltaY != 0) {
+            view.setTranslationY(-deltaY);
+        }
+        mPendingMoves.add(new MoveInfo(holder, fromX, fromY, toX, toY));
+        return true;
+    }
+
+    void animateMoveImpl(final ViewHolder holder, int fromX, int fromY, int toX, int toY) {
+        final View view = holder.itemView;
+        final int deltaX = toX - fromX;
+        final int deltaY = toY - fromY;
+        if (deltaX != 0) {
+            view.animate().translationX(0);
+        }
+        if (deltaY != 0) {
+            view.animate().translationY(0);
+        }
+        // TODO: make EndActions end listeners instead, since end actions aren't called when
+        // vpas are canceled (and can't end them. why?)
+        // need listener functionality in VPACompat for this. Ick.
+        final ViewPropertyAnimator animation = view.animate();
+        mMoveAnimations.add(holder);
+        animation.setDuration(getMoveDuration()).setListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationStart(Animator animator) {
+                dispatchMoveStarting(holder);
+            }
+
+            @Override
+            public void onAnimationCancel(Animator animator) {
+                if (deltaX != 0) {
+                    view.setTranslationX(0);
+                }
+                if (deltaY != 0) {
+                    view.setTranslationY(0);
+                }
+            }
+
+            @Override
+            public void onAnimationEnd(Animator animator) {
+                animation.setListener(null);
+                dispatchMoveFinished(holder);
+                mMoveAnimations.remove(holder);
+                dispatchFinishedWhenDone();
+            }
+        }).start();
+    }
+
+    @Override
+    public boolean animateChange(ViewHolder oldHolder, ViewHolder newHolder,
+                                 int fromX, int fromY, int toX, int toY) {
+        if (oldHolder == newHolder) {
+            // Don't know how to run change animations when the same view holder is re-used.
+            // run a move animation to handle position changes.
+            return animateMove(oldHolder, fromX, fromY, toX, toY);
+        }
+        changeAnimation(oldHolder, newHolder,
+                fromX, fromY, toX, toY);
+        mPendingChanges.add(new ChangeInfo(oldHolder, newHolder, fromX, fromY, toX, toY));
+        return true;
+    }
+
+    void animateChangeImpl(final ChangeInfo changeInfo) {
+        final ViewHolder holder = changeInfo.oldHolder;
+        final View view = holder == null ? null : holder.itemView;
+        final ViewHolder newHolder = changeInfo.newHolder;
+        final View newView = newHolder != null ? newHolder.itemView : null;
+        if (view != null) {
+            final ViewPropertyAnimator oldViewAnim = changeOldAnimation(holder, changeInfo);
+            mChangeAnimations.add(changeInfo.oldHolder);
+            oldViewAnim.setListener(new AnimatorListenerAdapter() {
+                @Override
+                public void onAnimationStart(Animator animator) {
+                    dispatchChangeStarting(changeInfo.oldHolder, true);
+                }
+
+                @Override
+                public void onAnimationEnd(Animator animator) {
+                    oldViewAnim.setListener(null);
+                    changeAnimationCleanup(holder);
+                    view.setTranslationX(0);
+                    view.setTranslationY(0);
+                    dispatchChangeFinished(changeInfo.oldHolder, true);
+                    mChangeAnimations.remove(changeInfo.oldHolder);
+                    dispatchFinishedWhenDone();
+                }
+            }).start();
+        }
+        if (newView != null) {
+            final ViewPropertyAnimator newViewAnimation = changeNewAnimation(newHolder);
+            mChangeAnimations.add(changeInfo.newHolder);
+            newViewAnimation.setListener(new AnimatorListenerAdapter() {
+                @Override
+                public void onAnimationStart(Animator animator) {
+                    dispatchChangeStarting(changeInfo.newHolder, false);
+                }
+
+                @Override
+                public void onAnimationEnd(Animator animator) {
+                    newViewAnimation.setListener(null);
+                    changeAnimationCleanup(newHolder);
+                    newView.setTranslationX(0);
+                    newView.setTranslationY(0);
+                    dispatchChangeFinished(changeInfo.newHolder, false);
+                    mChangeAnimations.remove(changeInfo.newHolder);
+                    dispatchFinishedWhenDone();
+                }
+            }).start();
+        }
+    }
+
+    /**
+     * the whole change animation if we have to cross animate two views
+     *
+     * @param oldHolder
+     * @param newHolder
+     * @param fromX
+     * @param fromY
+     * @param toX
+     * @param toY
+     */
+    public void changeAnimation(ViewHolder oldHolder, ViewHolder newHolder, int fromX, int fromY, int toX, int toY) {
+        final float prevTranslationX = oldHolder.itemView.getTranslationX();
+        final float prevTranslationY = oldHolder.itemView.getTranslationY();
+        final float prevValue = oldHolder.itemView.getAlpha();
+        resetAnimation(oldHolder);
+        int deltaX = (int) (toX - fromX - prevTranslationX);
+        int deltaY = (int) (toY - fromY - prevTranslationY);
+        // recover prev translation state after ending animation
+        oldHolder.itemView.setTranslationX(prevTranslationX);
+        oldHolder.itemView.setTranslationY(prevTranslationY);
+
+        oldHolder.itemView.setAlpha(prevValue);
+        if (newHolder != null) {
+            // carry over translation values
+            resetAnimation(newHolder);
+            newHolder.itemView.setTranslationX(-deltaX);
+            newHolder.itemView.setTranslationY(-deltaY);
+            newHolder.itemView.setAlpha(0);
+        }
+    }
+
+    /**
+     * the animation for removing the old view
+     *
+     * @param holder
+     * @return
+     */
+    public abstract ViewPropertyAnimator changeOldAnimation(ViewHolder holder, ChangeInfo changeInfo);
+
+    /**
+     * the animation for changing the new view
+     *
+     * @param holder
+     * @return
+     */
+    public abstract ViewPropertyAnimator changeNewAnimation(ViewHolder holder);
+
+    /**
+     * the cleanup method if the animation needs to be stopped. and tro prepare for the next view
+     *
+     * @param holder
+     */
+    public abstract void changeAnimationCleanup(ViewHolder holder);
+
+    private void endChangeAnimation(List<ChangeInfo> infoList, ViewHolder item) {
+        for (int i = infoList.size() - 1; i >= 0; i--) {
+            ChangeInfo changeInfo = infoList.get(i);
+            if (endChangeAnimationIfNecessary(changeInfo, item)) {
+                if (changeInfo.oldHolder == null && changeInfo.newHolder == null) {
+                    infoList.remove(changeInfo);
+                }
+            }
+        }
+    }
+
+    private void endChangeAnimationIfNecessary(ChangeInfo changeInfo) {
+        if (changeInfo.oldHolder != null) {
+            endChangeAnimationIfNecessary(changeInfo, changeInfo.oldHolder);
+        }
+        if (changeInfo.newHolder != null) {
+            endChangeAnimationIfNecessary(changeInfo, changeInfo.newHolder);
+        }
+    }
+
+    private boolean endChangeAnimationIfNecessary(ChangeInfo changeInfo, ViewHolder item) {
+        boolean oldItem = false;
+        if (changeInfo.newHolder == item) {
+            changeInfo.newHolder = null;
+        } else if (changeInfo.oldHolder == item) {
+            changeInfo.oldHolder = null;
+            oldItem = true;
+        } else {
+            return false;
+        }
+        changeAnimationCleanup(item);
+        item.itemView.setTranslationX(0);
+        item.itemView.setTranslationY(0);
+        dispatchChangeFinished(item, oldItem);
+        return true;
+    }
+
+    @Override
+    public void endAnimation(ViewHolder item) {
+        final View view = item.itemView;
+        // this will trigger end callback which should set properties to their target values.
+        view.animate().cancel();
+        // TODO if some other animations are chained to end, how do we cancel them as well?
+        for (int i = mPendingMoves.size() - 1; i >= 0; i--) {
+            MoveInfo moveInfo = mPendingMoves.get(i);
+            if (moveInfo.holder == item) {
+                view.setTranslationY(0);
+                view.setTranslationX(0);
+                dispatchMoveFinished(item);
+                mPendingMoves.remove(i);
+            }
+        }
+        endChangeAnimation(mPendingChanges, item);
+        if (mPendingRemovals.remove(item)) {
+            removeAnimationCleanup(item);
+            dispatchRemoveFinished(item);
+        }
+        if (mPendingAdditions.remove(item)) {
+            addAnimationCleanup(item);
+            dispatchAddFinished(item);
+        }
+
+        for (int i = mChangesList.size() - 1; i >= 0; i--) {
+            ArrayList<ChangeInfo> changes = mChangesList.get(i);
+            endChangeAnimation(changes, item);
+            if (changes.isEmpty()) {
+                mChangesList.remove(i);
+            }
+        }
+        for (int i = mMovesList.size() - 1; i >= 0; i--) {
+            ArrayList<MoveInfo> moves = mMovesList.get(i);
+            for (int j = moves.size() - 1; j >= 0; j--) {
+                MoveInfo moveInfo = moves.get(j);
+                if (moveInfo.holder == item) {
+                    view.setTranslationY(0);
+                    view.setTranslationX(0);
+                    dispatchMoveFinished(item);
+                    moves.remove(j);
+                    if (moves.isEmpty()) {
+                        mMovesList.remove(i);
+                    }
+                    break;
+                }
+            }
+        }
+        for (int i = mAdditionsList.size() - 1; i >= 0; i--) {
+            ArrayList<ViewHolder> additions = mAdditionsList.get(i);
+            if (additions.remove(item)) {
+                addAnimationCleanup(item);
+                dispatchAddFinished(item);
+                if (additions.isEmpty()) {
+                    mAdditionsList.remove(i);
+                }
+            }
+        }
+
+        // animations should be ended by the cancel above.
+        //noinspection PointlessBooleanExpression,ConstantConditions
+        if (mRemoveAnimations.remove(item) && DEBUG) {
+            throw new IllegalStateException("after animation is cancelled, item should not be in "
+                    + "mRemoveAnimations list");
+        }
+
+        //noinspection PointlessBooleanExpression,ConstantConditions
+        if (mAddAnimations.remove(item) && DEBUG) {
+            throw new IllegalStateException("after animation is cancelled, item should not be in "
+                    + "mAddAnimations list");
+        }
+
+        //noinspection PointlessBooleanExpression,ConstantConditions
+        if (mChangeAnimations.remove(item) && DEBUG) {
+            throw new IllegalStateException("after animation is cancelled, item should not be in "
+                    + "mChangeAnimations list");
+        }
+
+        //noinspection PointlessBooleanExpression,ConstantConditions
+        if (mMoveAnimations.remove(item) && DEBUG) {
+            throw new IllegalStateException("after animation is cancelled, item should not be in "
+                    + "mMoveAnimations list");
+        }
+        dispatchFinishedWhenDone();
+    }
+
+    private void resetAnimation(ViewHolder holder) {
+
+        if (sDefaultInterpolator == null) {
+            sDefaultInterpolator = new ValueAnimator().getInterpolator();
+        }
+        holder.itemView.animate().setInterpolator(sDefaultInterpolator);
+        endAnimation(holder);
+    }
+
+    @Override
+    public boolean isRunning() {
+        return (!mPendingAdditions.isEmpty()
+                || !mPendingChanges.isEmpty()
+                || !mPendingMoves.isEmpty()
+                || !mPendingRemovals.isEmpty()
+                || !mMoveAnimations.isEmpty()
+                || !mRemoveAnimations.isEmpty()
+                || !mAddAnimations.isEmpty()
+                || !mChangeAnimations.isEmpty()
+                || !mMovesList.isEmpty()
+                || !mAdditionsList.isEmpty()
+                || !mChangesList.isEmpty());
+    }
+
+    /**
+     * Check the state of currently pending and running animations. If there are none
+     * pending/running, call {@link #dispatchAnimationsFinished()} to notify any
+     * listeners.
+     */
+    void dispatchFinishedWhenDone() {
+        if (!isRunning()) {
+            dispatchAnimationsFinished();
+        }
+    }
+
+    @Override
+    public void endAnimations() {
+        int count = mPendingMoves.size();
+        for (int i = count - 1; i >= 0; i--) {
+            MoveInfo item = mPendingMoves.get(i);
+            View view = item.holder.itemView;
+            view.setTranslationY(0);
+            view.setTranslationX(0);
+            dispatchMoveFinished(item.holder);
+            mPendingMoves.remove(i);
+        }
+        count = mPendingRemovals.size();
+        for (int i = count - 1; i >= 0; i--) {
+            ViewHolder item = mPendingRemovals.get(i);
+            dispatchRemoveFinished(item);
+            mPendingRemovals.remove(i);
+        }
+        count = mPendingAdditions.size();
+        for (int i = count - 1; i >= 0; i--) {
+            ViewHolder item = mPendingAdditions.get(i);
+            addAnimationCleanup(item);
+            dispatchAddFinished(item);
+            mPendingAdditions.remove(i);
+        }
+        count = mPendingChanges.size();
+        for (int i = count - 1; i >= 0; i--) {
+            endChangeAnimationIfNecessary(mPendingChanges.get(i));
+        }
+        mPendingChanges.clear();
+        if (!isRunning()) {
+            return;
+        }
+
+        int listCount = mMovesList.size();
+        for (int i = listCount - 1; i >= 0; i--) {
+            ArrayList<MoveInfo> moves = mMovesList.get(i);
+            count = moves.size();
+            for (int j = count - 1; j >= 0; j--) {
+                MoveInfo moveInfo = moves.get(j);
+                ViewHolder item = moveInfo.holder;
+                View view = item.itemView;
+                view.setTranslationY(0);
+                view.setTranslationX(0);
+                dispatchMoveFinished(moveInfo.holder);
+                moves.remove(j);
+                if (moves.isEmpty()) {
+                    mMovesList.remove(moves);
+                }
+            }
+        }
+        listCount = mAdditionsList.size();
+        for (int i = listCount - 1; i >= 0; i--) {
+            ArrayList<ViewHolder> additions = mAdditionsList.get(i);
+            count = additions.size();
+            for (int j = count - 1; j >= 0; j--) {
+                ViewHolder item = additions.get(j);
+                View view = item.itemView;
+                addAnimationCleanup(item);
+                dispatchAddFinished(item);
+                additions.remove(j);
+                if (additions.isEmpty()) {
+                    mAdditionsList.remove(additions);
+                }
+            }
+        }
+        listCount = mChangesList.size();
+        for (int i = listCount - 1; i >= 0; i--) {
+            ArrayList<ChangeInfo> changes = mChangesList.get(i);
+            count = changes.size();
+            for (int j = count - 1; j >= 0; j--) {
+                endChangeAnimationIfNecessary(changes.get(j));
+                if (changes.isEmpty()) {
+                    mChangesList.remove(changes);
+                }
+            }
+        }
+
+        cancelAll(mRemoveAnimations);
+        cancelAll(mMoveAnimations);
+        cancelAll(mAddAnimations);
+        cancelAll(mChangeAnimations);
+
+        dispatchAnimationsFinished();
+    }
+
+    void cancelAll(List<ViewHolder> viewHolders) {
+        for (int i = viewHolders.size() - 1; i >= 0; i--) {
+            viewHolders.get(i).itemView.animate().cancel();
+        }
+    }
+
+    /**
+     * {@inheritDoc}
+     * <p>
+     * If the payload list is not empty, DefaultItemAnimator returns <code>true</code>.
+     * When this is the case:
+     * <ul>
+     * <li>If you override {@link #animateChange(ViewHolder, ViewHolder, int, int, int, int)}, both
+     * ViewHolder arguments will be the same instance.
+     * </li>
+     * <li>
+     * If you are not overriding {@link #animateChange(ViewHolder, ViewHolder, int, int, int, int)},
+     * then DefaultItemAnimator will call {@link #animateMove(ViewHolder, int, int, int, int)} and
+     * run a move animation instead.
+     * </li>
+     * </ul>
+     */
+    @Override
+    public boolean canReuseUpdatedViewHolder(@NonNull ViewHolder viewHolder,
+                                             @NonNull List<Object> payloads) {
+        return !payloads.isEmpty() || super.canReuseUpdatedViewHolder(viewHolder, payloads);
+    }
+}
diff --git a/core/src/main/kotlin/ca/allanwang/kau/animators/BaseSlideAlphaAnimator.kt b/core/src/main/kotlin/ca/allanwang/kau/animators/BaseSlideAlphaAnimator.kt
new file mode 100644
index 0000000..a963358
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/animators/BaseSlideAlphaAnimator.kt
@@ -0,0 +1,52 @@
+package ca.allanwang.kau.animators
+
+import android.support.v7.widget.RecyclerView
+import android.view.ViewPropertyAnimator
+
+/**
+ * Created by Allan Wang on 2017-06-27.
+ *
+ * Base for sliding animators
+ * item delay factor by default can be 0.125f
+ */
+abstract class BaseSlideAlphaAnimator(itemDelayFactor: Float) : BaseDelayAnimator(itemDelayFactor) {
+
+    override fun addAnimation(holder: RecyclerView.ViewHolder): ViewPropertyAnimator {
+        return super.addAnimation(holder).apply {
+            translationY(0f)
+            translationX(0f)
+            alpha(1f)
+        }
+    }
+
+    final override fun addAnimationCleanup(holder: RecyclerView.ViewHolder) {
+        with(holder.itemView) {
+            translationY = 0f
+            translationX = 0f
+            alpha = 1f
+        }
+    }
+
+    override fun getAddDelay(remove: Long, move: Long, change: Long): Long = 0
+
+    override fun getRemoveDelay(remove: Long, move: Long, change: Long): Long = 0
+
+    /**
+     * Partial removal animation
+     * As of now, all it does it change the alpha
+     * To have it slide, add onto it in a sub class
+     */
+    override fun removeAnimation(holder: RecyclerView.ViewHolder): ViewPropertyAnimator {
+        return super.addAnimation(holder).apply {
+            alpha(0f)
+        }
+    }
+
+    override final fun removeAnimationCleanup(holder: RecyclerView.ViewHolder) {
+        with(holder.itemView) {
+            translationY = 0f
+            translationX = 0f
+            alpha = 1f
+        }
+    }
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/animators/DefaultAnimator.kt b/core/src/main/kotlin/ca/allanwang/kau/animators/DefaultAnimator.kt
new file mode 100644
index 0000000..9aeafde
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/animators/DefaultAnimator.kt
@@ -0,0 +1,63 @@
+package ca.allanwang.kau.animators
+
+import android.support.v7.widget.RecyclerView
+import android.view.ViewPropertyAnimator
+
+/**
+ * Created by Allan Wang on 2017-06-27.
+ */
+open class DefaultAnimator : BaseItemAnimator() {
+
+    override fun removeAnimation(holder: RecyclerView.ViewHolder): ViewPropertyAnimator {
+        return holder.itemView.animate().apply {
+            alpha(0f)
+            duration = this@DefaultAnimator.removeDuration
+            interpolator = this@DefaultAnimator.interpolator
+        }
+    }
+
+    override fun removeAnimationCleanup(holder: RecyclerView.ViewHolder) {
+        holder.itemView.alpha = 1f
+    }
+
+    override fun addAnimationPrepare(holder: RecyclerView.ViewHolder) {
+        holder.itemView.alpha = 0f
+    }
+
+    override fun addAnimation(holder: RecyclerView.ViewHolder): ViewPropertyAnimator {
+        return holder.itemView.animate().apply {
+            alpha(1f)
+            duration = this@DefaultAnimator.addDuration
+            interpolator = this@DefaultAnimator.interpolator
+        }
+    }
+
+    override fun addAnimationCleanup(holder: RecyclerView.ViewHolder) {
+        holder.itemView.alpha = 1f
+    }
+
+    override fun changeOldAnimation(holder: RecyclerView.ViewHolder, changeInfo: ChangeInfo): ViewPropertyAnimator {
+        return holder.itemView.animate().apply {
+            alpha(0f)
+            translationX(changeInfo.toX.toFloat() - changeInfo.fromX)
+            translationY(changeInfo.toY.toFloat() - changeInfo.fromY)
+            duration = this@DefaultAnimator.changeDuration
+            interpolator = this@DefaultAnimator.interpolator
+        }
+    }
+
+    override fun changeNewAnimation(holder: RecyclerView.ViewHolder): ViewPropertyAnimator {
+        return holder.itemView.animate().apply {
+            alpha(1f)
+            translationX(0f)
+            translationY(0f)
+            duration = this@DefaultAnimator.changeDuration
+            interpolator = this@DefaultAnimator.interpolator
+        }
+    }
+
+    override fun changeAnimationCleanup(holder: RecyclerView.ViewHolder) {
+        holder.itemView.alpha = 1f
+    }
+
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/animators/FadeScaleAnimator.kt b/core/src/main/kotlin/ca/allanwang/kau/animators/FadeScaleAnimator.kt
new file mode 100644
index 0000000..e968cda
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/animators/FadeScaleAnimator.kt
@@ -0,0 +1,51 @@
+package ca.allanwang.kau.animators
+
+import android.support.v7.widget.RecyclerView
+import android.view.ViewPropertyAnimator
+
+/**
+ * Created by Allan Wang on 2017-06-29.
+ */
+open class FadeScaleAnimator(val scaleFactor: Float = 0.7f, itemDelayFactor: Float = 0.125f) : BaseDelayAnimator(itemDelayFactor) {
+
+    override fun addAnimationPrepare(holder: RecyclerView.ViewHolder) {
+        with(holder.itemView) {
+            scaleX = scaleFactor
+            scaleY = scaleFactor
+            alpha = 0f
+        }
+    }
+
+    override final fun addAnimation(holder: RecyclerView.ViewHolder): ViewPropertyAnimator {
+        return super.addAnimation(holder).apply {
+            scaleX(1f)
+            scaleY(1f)
+            alpha(1f)
+        }
+    }
+
+
+    final override fun addAnimationCleanup(holder: RecyclerView.ViewHolder) {
+        with(holder.itemView) {
+            scaleX = 1f
+            scaleY = 1f
+            alpha = 1f
+        }
+    }
+
+    override fun removeAnimation(holder: RecyclerView.ViewHolder): ViewPropertyAnimator {
+        return super.removeAnimation(holder).apply {
+            scaleX(scaleFactor)
+            scaleY(scaleFactor)
+            alpha(0f)
+        }
+    }
+
+    override final fun removeAnimationCleanup(holder: RecyclerView.ViewHolder) {
+        with(holder.itemView) {
+            translationY = 0f
+            translationX = 0f
+            alpha = 1f
+        }
+    }
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/animators/NoAnimator.kt b/core/src/main/kotlin/ca/allanwang/kau/animators/NoAnimator.kt
new file mode 100644
index 0000000..244287b
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/animators/NoAnimator.kt
@@ -0,0 +1,41 @@
+package ca.allanwang.kau.animators
+
+import android.support.v7.widget.RecyclerView
+import android.view.ViewPropertyAnimator
+
+/**
+ * Created by Allan Wang on 2017-06-27.
+ *
+ * Truly have no animation
+ */
+class NoAnimator : DefaultAnimator() {
+    override fun addAnimationPrepare(holder: RecyclerView.ViewHolder) {}
+
+    override fun addAnimation(holder: RecyclerView.ViewHolder): ViewPropertyAnimator = holder.itemView.animate().apply { duration = 0 }
+
+    override fun addAnimationCleanup(holder: RecyclerView.ViewHolder) {}
+
+    override fun changeOldAnimation(holder: RecyclerView.ViewHolder, changeInfo: ChangeInfo): ViewPropertyAnimator = holder.itemView.animate().apply { duration = 0 }
+
+    override fun changeNewAnimation(holder: RecyclerView.ViewHolder): ViewPropertyAnimator = holder.itemView.animate().apply { duration = 0 }
+
+    override fun changeAnimationCleanup(holder: RecyclerView.ViewHolder) {}
+
+    override fun changeAnimation(oldHolder: RecyclerView.ViewHolder, newHolder: RecyclerView.ViewHolder?, fromX: Int, fromY: Int, toX: Int, toY: Int) {}
+
+    override fun getAddDelay(remove: Long, move: Long, change: Long): Long = 0
+
+    override fun getAddDuration(): Long = 0
+
+    override fun getMoveDuration(): Long = 0
+
+    override fun getRemoveDuration(): Long = 0
+
+    override fun getChangeDuration(): Long = 0
+
+    override fun getRemoveDelay(remove: Long, move: Long, change: Long): Long = 0
+
+    override fun removeAnimation(holder: RecyclerView.ViewHolder): ViewPropertyAnimator = holder.itemView.animate().apply { duration = 0 }
+
+    override fun removeAnimationCleanup(holder: RecyclerView.ViewHolder) {}
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/animators/SlideUpExitRightAnimator.kt b/core/src/main/kotlin/ca/allanwang/kau/animators/SlideUpExitRightAnimator.kt
new file mode 100644
index 0000000..8670493
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/animators/SlideUpExitRightAnimator.kt
@@ -0,0 +1,23 @@
+package ca.allanwang.kau.animators
+
+import android.support.v7.widget.RecyclerView
+import android.view.ViewPropertyAnimator
+
+/**
+ * Created by Allan Wang on 2017-06-27.
+ */
+class SlideUpExitRightAnimator(itemDelayFactor: Float = 0.125f) : BaseSlideAlphaAnimator(itemDelayFactor) {
+
+    override fun addAnimationPrepare(holder: RecyclerView.ViewHolder) {
+        with(holder.itemView) {
+            translationY = height.toFloat()
+            alpha = 0f
+        }
+    }
+
+    override fun removeAnimation(holder: RecyclerView.ViewHolder): ViewPropertyAnimator {
+        return super.removeAnimation(holder).apply {
+            translationX(holder.itemView.width.toFloat())
+        }
+    }
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/changelog/Changelog.kt b/core/src/main/kotlin/ca/allanwang/kau/changelog/Changelog.kt
new file mode 100644
index 0000000..302d9dc
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/changelog/Changelog.kt
@@ -0,0 +1,105 @@
+package ca.allanwang.kau.changelog
+
+import android.content.Context
+import android.content.res.XmlResourceParser
+import android.os.Handler
+import android.support.annotation.ColorInt
+import android.support.annotation.LayoutRes
+import android.support.annotation.XmlRes
+import android.support.v7.widget.RecyclerView
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import ca.allanwang.kau.R
+import ca.allanwang.kau.utils.bindOptionalView
+import ca.allanwang.kau.utils.bindView
+import ca.allanwang.kau.utils.materialDialog
+import ca.allanwang.kau.utils.use
+import com.afollestad.materialdialogs.MaterialDialog
+import org.jetbrains.anko.doAsync
+import org.jetbrains.anko.uiThread
+import org.xmlpull.v1.XmlPullParser
+import java.util.*
+
+
+/**
+ * Created by Allan Wang on 2017-05-28.
+ */
+
+fun Context.showChangelog(@XmlRes xmlRes: Int, @ColorInt textColor: Int? = null, customize: MaterialDialog.Builder.() -> Unit = {}) {
+    doAsync {
+        val items = parse(this@showChangelog, xmlRes)
+        uiThread {
+            materialDialog {
+                title(R.string.kau_changelog)
+                positiveText(R.string.kau_great)
+                adapter(ChangelogAdapter(items, textColor), null)
+                customize()
+            }
+        }
+    }
+}
+
+/**
+ * Internals of the changelog dialog
+ * Contains an mainAdapter for each item, as well as the tags to parse
+ */
+internal class ChangelogAdapter(val items: List<Pair<String, ChangelogType>>, @ColorInt val textColor: Int? = null) : RecyclerView.Adapter<ChangelogAdapter.ChangelogVH>() {
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) = ChangelogVH(LayoutInflater.from(parent.context)
+            .inflate(items[viewType].second.layout, parent, false))
+
+    override fun onBindViewHolder(holder: ChangelogVH, position: Int) {
+        holder.text.text = items[position].first
+        if (textColor != null) {
+            holder.text.setTextColor(textColor)
+            holder.bullet?.setTextColor(textColor)
+        }
+    }
+
+    override fun getItemId(position: Int) = position.toLong()
+
+    override fun getItemViewType(position: Int) = position
+
+    override fun getItemCount() = items.size
+
+    internal class ChangelogVH(itemView: View) : RecyclerView.ViewHolder(itemView) {
+        val text: TextView by bindView(R.id.kau_changelog_text)
+        val bullet: TextView? by bindOptionalView(R.id.kau_changelog_bullet)
+    }
+}
+
+internal fun parse(context: Context, @XmlRes xmlRes: Int): List<Pair<String, ChangelogType>> {
+    val items = mutableListOf<Pair<String, ChangelogType>>()
+    context.resources.getXml(xmlRes).use {
+        parser: XmlResourceParser ->
+        var eventType = parser.eventType
+        while (eventType != XmlPullParser.END_DOCUMENT) {
+            if (eventType == XmlPullParser.START_TAG)
+                ChangelogType.values.any { it.add(parser, items) }
+            eventType = parser.next()
+        }
+    }
+    return items
+}
+
+internal enum class ChangelogType(val tag: String, val attr: String, @LayoutRes val layout: Int) {
+    TITLE("version", "title", R.layout.kau_changelog_title),
+    ITEM("item", "text", R.layout.kau_changelog_content);
+
+    companion object {
+        @JvmStatic val values = values()
+    }
+
+    /**
+     * Returns true if tag matches; false otherwise
+     */
+    fun add(parser: XmlResourceParser, list: MutableList<Pair<String, ChangelogType>>): Boolean {
+        if (parser.name != tag) return false
+        if (parser.getAttributeValue(null, attr).isNotBlank())
+            list.add(Pair(parser.getAttributeValue(null, attr), this))
+        return true
+    }
+}
+
diff --git a/core/src/main/kotlin/ca/allanwang/kau/dialogs/color/CircleView.kt b/core/src/main/kotlin/ca/allanwang/kau/dialogs/color/CircleView.kt
new file mode 100644
index 0000000..3430b42
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/dialogs/color/CircleView.kt
@@ -0,0 +1,228 @@
+package ca.allanwang.kau.dialogs.color
+
+import android.animation.Animator
+import android.animation.AnimatorListenerAdapter
+import android.animation.ValueAnimator
+import android.content.Context
+import android.content.res.ColorStateList
+import android.graphics.Canvas
+import android.graphics.Color
+import android.graphics.Paint
+import android.graphics.Rect
+import android.graphics.drawable.Drawable
+import android.graphics.drawable.RippleDrawable
+import android.graphics.drawable.ShapeDrawable
+import android.graphics.drawable.StateListDrawable
+import android.graphics.drawable.shapes.OvalShape
+import android.os.Build
+import android.support.annotation.ColorInt
+import android.support.annotation.ColorRes
+import android.support.annotation.FloatRange
+import android.support.v4.view.GravityCompat
+import android.support.v4.view.ViewCompat
+import android.util.AttributeSet
+import android.view.Gravity
+import android.widget.FrameLayout
+import android.widget.Toast
+import ca.allanwang.kau.utils.color
+import ca.allanwang.kau.utils.getDip
+import ca.allanwang.kau.utils.toColor
+import ca.allanwang.kau.utils.toHSV
+
+/**
+ * Created by Allan Wang on 2017-06-10.
+ *
+ * An extension of MaterialDialog's CircleView with animation selection
+ * [https://github.com/afollestad/material-dialogs/blob/master/commons/src/main/java/com/afollestad/materialdialogs/color/CircleView.java]
+ */
+class CircleView @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0) : FrameLayout(context, attrs, defStyleAttr) {
+
+    private val borderWidthMicro: Float = context.getDip(1f)
+    private val borderWidthSmall: Float = context.getDip(3f)
+    private val borderWidthLarge: Float = context.getDip(5f)
+    private var whiteOuterBound: Float = borderWidthLarge
+
+    private val outerPaint: Paint = Paint().apply { isAntiAlias = true }
+    private val whitePaint: Paint = Paint().apply { isAntiAlias = true; color = Color.WHITE }
+    private val innerPaint: Paint = Paint().apply { isAntiAlias = true }
+    private var selected: Boolean = false
+    var withBorder: Boolean = false
+        get() = field
+        set(value) {
+            if (field != value) {
+                field = value
+                invalidate()
+            }
+        }
+
+    init {
+        update(Color.DKGRAY)
+        setWillNotDraw(false)
+    }
+
+    private fun update(@ColorInt color: Int) {
+        innerPaint.color = color
+        outerPaint.color = shiftColorDown(color)
+
+        val selector = createSelector(color)
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+            val states = arrayOf(intArrayOf(android.R.attr.state_pressed))
+            val colors = intArrayOf(shiftColorUp(color))
+            val rippleColors = ColorStateList(states, colors)
+            foreground = RippleDrawable(rippleColors, selector, null)
+        } else {
+            foreground = selector
+        }
+    }
+
+    override fun setBackgroundColor(@ColorInt color: Int) {
+        update(color)
+        requestLayout()
+        invalidate()
+    }
+
+    override fun setBackgroundResource(@ColorRes color: Int) {
+        setBackgroundColor(context.color(color))
+    }
+
+
+    @Deprecated("")
+    override fun setBackground(background: Drawable) {
+        throw IllegalStateException("Cannot use setBackground() on CircleView.")
+    }
+
+
+    @Deprecated("")
+    override fun setBackgroundDrawable(background: Drawable) {
+        throw IllegalStateException("Cannot use setBackgroundDrawable() on CircleView.")
+    }
+
+
+    @Deprecated("")
+    override fun setActivated(activated: Boolean) {
+        throw IllegalStateException("Cannot use setActivated() on CircleView.")
+    }
+
+    override fun setSelected(selected: Boolean) {
+        this.selected = selected
+        whiteOuterBound = borderWidthLarge
+        invalidate()
+    }
+
+    fun animateSelected(selected: Boolean) {
+        if (this.selected == selected) return
+        this.selected = true // We need to draw the other bands
+        val range = if (selected) Pair(-borderWidthSmall, borderWidthLarge) else Pair(borderWidthLarge, -borderWidthSmall)
+        val animator = ValueAnimator.ofFloat(range.first, range.second)
+        with(animator) {
+            reverse()
+            duration = 150L
+            addUpdateListener { animation ->
+                whiteOuterBound = animation.animatedValue as Float
+                invalidate()
+            }
+            addListener(object : AnimatorListenerAdapter() {
+                override fun onAnimationEnd(animation: Animator) {
+                    this@CircleView.selected = selected
+                }
+
+                override fun onAnimationCancel(animation: Animator) {
+                    this@CircleView.selected = selected
+                }
+            })
+            start()
+        }
+    }
+
+    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
+        super.onMeasure(widthMeasureSpec, widthMeasureSpec)
+        setMeasuredDimension(measuredWidth, measuredWidth)
+    }
+
+    override fun onDraw(canvas: Canvas) {
+        super.onDraw(canvas)
+        val centerWidth = (measuredWidth / 2).toFloat()
+        val centerHeight = (measuredHeight / 2).toFloat()
+        if (withBorder) canvas.drawCircle(centerWidth, centerHeight, centerWidth, whitePaint)
+        if (selected) {
+            val whiteRadius = centerWidth - whiteOuterBound
+            val innerRadius = whiteRadius - borderWidthSmall
+            if (whiteRadius >= centerWidth) {
+                canvas.drawCircle(centerWidth, centerHeight, centerWidth, whitePaint)
+            } else {
+                canvas.drawCircle(centerWidth, centerHeight, if (withBorder) centerWidth - borderWidthMicro else centerWidth, outerPaint)
+                canvas.drawCircle(centerWidth, centerHeight, whiteRadius, whitePaint)
+            }
+            canvas.drawCircle(centerWidth, centerHeight, innerRadius, innerPaint)
+        } else {
+            canvas.drawCircle(centerWidth, centerHeight, if (withBorder) centerWidth - borderWidthMicro else centerWidth, innerPaint)
+        }
+    }
+
+    private fun createSelector(color: Int): Drawable {
+        val darkerCircle = ShapeDrawable(OvalShape())
+        darkerCircle.paint.color = translucentColor(shiftColorUp(color))
+        val stateListDrawable = StateListDrawable()
+        stateListDrawable.addState(intArrayOf(android.R.attr.state_pressed), darkerCircle)
+        return stateListDrawable
+    }
+
+    fun showHint(color: Int) {
+        val screenPos = IntArray(2)
+        val displayFrame = Rect()
+        getLocationOnScreen(screenPos)
+        getWindowVisibleDisplayFrame(displayFrame)
+        val context = context
+        val width = width
+        val height = height
+        val midy = screenPos[1] + height / 2
+        var referenceX = screenPos[0] + width / 2
+        if (ViewCompat.getLayoutDirection(this) == ViewCompat.LAYOUT_DIRECTION_LTR) {
+            val screenWidth = context.resources.displayMetrics.widthPixels
+            referenceX = screenWidth - referenceX // mirror
+        }
+        val cheatSheet = Toast
+                .makeText(context, String.format("#%06X", 0xFFFFFF and color), Toast.LENGTH_SHORT)
+        if (midy < displayFrame.height()) {
+            // Show along the top; follow action buttons
+            cheatSheet.setGravity(Gravity.TOP or GravityCompat.END, referenceX,
+                    screenPos[1] + height - displayFrame.top)
+        } else {
+            // Show along the bottom center
+            cheatSheet.setGravity(Gravity.BOTTOM or Gravity.CENTER_HORIZONTAL, 0, height)
+        }
+        cheatSheet.show()
+    }
+
+    companion object {
+
+        @ColorInt
+        @JvmStatic
+        private fun translucentColor(color: Int): Int {
+            val factor = 0.7f
+            val alpha = Math.round(Color.alpha(color) * factor)
+            val red = Color.red(color)
+            val green = Color.green(color)
+            val blue = Color.blue(color)
+            return Color.argb(alpha, red, green, blue)
+        }
+
+        @ColorInt
+        @JvmStatic
+        fun shiftColor(@ColorInt color: Int,
+                       @FloatRange(from = 0.0, to = 2.0) by: Float): Int {
+            if (by == 1f) return color
+            val hsv = color.toHSV()
+            hsv[2] *= by // value component
+            return hsv.toColor()
+        }
+
+        @ColorInt
+        @JvmStatic
+        fun shiftColorDown(@ColorInt color: Int): Int = shiftColor(color, 0.9f)
+
+        @ColorInt
+        @JvmStatic
+        fun shiftColorUp(@ColorInt color: Int): Int = shiftColor(color, 1.1f)
+    }
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/dialogs/color/ColorPalette.kt b/core/src/main/kotlin/ca/allanwang/kau/dialogs/color/ColorPalette.kt
new file mode 100644
index 0000000..22bd0d4
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/dialogs/color/ColorPalette.kt
@@ -0,0 +1,349 @@
+package ca.allanwang.kau.dialogs.color
+
+import android.graphics.Color
+
+/**
+ * @author Aidan Follestad (afollestad)
+ */
+internal object ColorPalette {
+
+    val PRIMARY_COLORS: IntArray by lazy {
+        colorArrayOf(
+                "#F44336",
+                "#E91E63",
+                "#9C27B0",
+                "#673AB7",
+                "#3F51B5",
+                "#2196F3",
+                "#03A9F4",
+                "#00BCD4",
+                "#009688",
+                "#4CAF50",
+                "#8BC34A",
+                "#CDDC39",
+                "#FFEB3B",
+                "#FFC107",
+                "#FF9800",
+                "#FF5722",
+                "#795548",
+                "#9E9E9E",
+                "#607D8B")
+    }
+
+    val PRIMARY_COLORS_SUB: Array<IntArray> by lazy {
+        arrayOf(colorArrayOf(
+                "#FFEBEE",
+                "#FFCDD2",
+                "#EF9A9A",
+                "#E57373",
+                "#EF5350",
+                "#F44336",
+                "#E53935",
+                "#D32F2F",
+                "#C62828",
+                "#B71C1C"
+        ), colorArrayOf(
+                "#FCE4EC",
+                "#F8BBD0",
+                "#F48FB1",
+                "#F06292",
+                "#EC407A",
+                "#E91E63",
+                "#D81B60",
+                "#C2185B",
+                "#AD1457",
+                "#880E4F"
+        ), colorArrayOf(
+                "#F3E5F5",
+                "#E1BEE7",
+                "#CE93D8",
+                "#BA68C8",
+                "#AB47BC",
+                "#9C27B0",
+                "#8E24AA",
+                "#7B1FA2",
+                "#6A1B9A",
+                "#4A148C"
+        ), colorArrayOf(
+                "#EDE7F6",
+                "#D1C4E9",
+                "#B39DDB",
+                "#9575CD",
+                "#7E57C2",
+                "#673AB7",
+                "#5E35B1",
+                "#512DA8",
+                "#4527A0",
+                "#311B92"
+        ), colorArrayOf(
+                "#E8EAF6",
+                "#C5CAE9",
+                "#9FA8DA",
+                "#7986CB",
+                "#5C6BC0",
+                "#3F51B5",
+                "#3949AB",
+                "#303F9F",
+                "#283593",
+                "#1A237E"
+        ), colorArrayOf(
+                "#E3F2FD",
+                "#BBDEFB",
+                "#90CAF9",
+                "#64B5F6",
+                "#42A5F5",
+                "#2196F3",
+                "#1E88E5",
+                "#1976D2",
+                "#1565C0",
+                "#0D47A1"
+        ), colorArrayOf(
+                "#E1F5FE",
+                "#B3E5FC",
+                "#81D4FA",
+                "#4FC3F7",
+                "#29B6F6",
+                "#03A9F4",
+                "#039BE5",
+                "#0288D1",
+                "#0277BD",
+                "#01579B"
+        ), colorArrayOf(
+                "#E0F7FA",
+                "#B2EBF2",
+                "#80DEEA",
+                "#4DD0E1",
+                "#26C6DA",
+                "#00BCD4",
+                "#00ACC1",
+                "#0097A7",
+                "#00838F",
+                "#006064"
+        ), colorArrayOf(
+                "#E0F2F1",
+                "#B2DFDB",
+                "#80CBC4",
+                "#4DB6AC",
+                "#26A69A",
+                "#009688",
+                "#00897B",
+                "#00796B",
+                "#00695C",
+                "#004D40"
+        ), colorArrayOf(
+                "#E8F5E9",
+                "#C8E6C9",
+                "#A5D6A7",
+                "#81C784",
+                "#66BB6A",
+                "#4CAF50",
+                "#43A047",
+                "#388E3C",
+                "#2E7D32",
+                "#1B5E20"
+        ), colorArrayOf(
+                "#F1F8E9",
+                "#DCEDC8",
+                "#C5E1A5",
+                "#AED581",
+                "#9CCC65",
+                "#8BC34A",
+                "#7CB342",
+                "#689F38",
+                "#558B2F",
+                "#33691E"
+        ), colorArrayOf(
+                "#F9FBE7",
+                "#F0F4C3",
+                "#E6EE9C",
+                "#DCE775",
+                "#D4E157",
+                "#CDDC39",
+                "#C0CA33",
+                "#AFB42B",
+                "#9E9D24",
+                "#827717"
+        ), colorArrayOf(
+                "#FFFDE7",
+                "#FFF9C4",
+                "#FFF59D",
+                "#FFF176",
+                "#FFEE58",
+                "#FFEB3B",
+                "#FDD835",
+                "#FBC02D",
+                "#F9A825",
+                "#F57F17"
+        ), colorArrayOf(
+                "#FFF8E1",
+                "#FFECB3",
+                "#FFE082",
+                "#FFD54F",
+                "#FFCA28",
+                "#FFC107",
+                "#FFB300",
+                "#FFA000",
+                "#FF8F00",
+                "#FF6F00"
+        ), colorArrayOf(
+                "#FFF3E0",
+                "#FFE0B2",
+                "#FFCC80",
+                "#FFB74D",
+                "#FFA726",
+                "#FF9800",
+                "#FB8C00",
+                "#F57C00",
+                "#EF6C00",
+                "#E65100"
+        ), colorArrayOf(
+                "#FBE9E7",
+                "#FFCCBC",
+                "#FFAB91",
+                "#FF8A65",
+                "#FF7043",
+                "#FF5722",
+                "#F4511E",
+                "#E64A19",
+                "#D84315",
+                "#BF360C"
+        ), colorArrayOf(
+                "#EFEBE9",
+                "#D7CCC8",
+                "#BCAAA4",
+                "#A1887F",
+                "#8D6E63",
+                "#795548",
+                "#6D4C41",
+                "#5D4037",
+                "#4E342E",
+                "#3E2723"
+        ), colorArrayOf(
+                "#FAFAFA",
+                "#F5F5F5",
+                "#EEEEEE",
+                "#E0E0E0",
+                "#BDBDBD",
+                "#9E9E9E",
+                "#757575",
+                "#616161",
+                "#424242",
+                "#212121"
+        ), colorArrayOf(
+                "#ECEFF1",
+                "#CFD8DC",
+                "#B0BEC5",
+                "#90A4AE",
+                "#78909C",
+                "#607D8B",
+                "#546E7A",
+                "#455A64",
+                "#37474F",
+                "#263238"))
+    }
+
+    val ACCENT_COLORS: IntArray by lazy {
+        colorArrayOf(
+                "#FF1744",
+                "#F50057",
+                "#D500F9",
+                "#651FFF",
+                "#3D5AFE",
+                "#2979FF",
+                "#00B0FF",
+                "#00E5FF",
+                "#1DE9B6",
+                "#00E676",
+                "#76FF03",
+                "#C6FF00",
+                "#FFEA00",
+                "#FFC400",
+                "#FF9100",
+                "#FF3D00")
+    }
+
+    val ACCENT_COLORS_SUB: Array<IntArray> by lazy {
+        arrayOf(colorArrayOf("#FF8A80",
+                "#FF5252",
+                "#FF1744",
+                "#D50000"
+        ), colorArrayOf(
+                "#FF80AB",
+                "#FF4081",
+                "#F50057",
+                "#C51162"
+        ), colorArrayOf(
+                "#EA80FC",
+                "#E040FB",
+                "#D500F9",
+                "#AA00FF"
+        ), colorArrayOf(
+                "#B388FF",
+                "#7C4DFF",
+                "#651FFF",
+                "#6200EA"
+        ), colorArrayOf(
+                "#8C9EFF",
+                "#536DFE",
+                "#3D5AFE",
+                "#304FFE"
+        ), colorArrayOf(
+                "#82B1FF",
+                "#448AFF",
+                "#2979FF",
+                "#2962FF"
+        ), colorArrayOf(
+                "#80D8FF",
+                "#40C4FF",
+                "#00B0FF",
+                "#0091EA"
+        ), colorArrayOf(
+                "#84FFFF",
+                "#18FFFF",
+                "#00E5FF",
+                "#00B8D4"
+        ), colorArrayOf(
+                "#A7FFEB",
+                "#64FFDA",
+                "#1DE9B6",
+                "#00BFA5"
+        ), colorArrayOf(
+                "#B9F6CA",
+                "#69F0AE",
+                "#00E676",
+                "#00C853"
+        ), colorArrayOf(
+                "#CCFF90",
+                "#B2FF59",
+                "#76FF03",
+                "#64DD17"
+        ), colorArrayOf(
+                "#F4FF81",
+                "#EEFF41",
+                "#C6FF00",
+                "#AEEA00"
+        ), colorArrayOf(
+                "#FFFF8D",
+                "#FFFF00",
+                "#FFEA00",
+                "#FFD600"
+        ), colorArrayOf(
+                "#FFE57F",
+                "#FFD740",
+                "#FFC400",
+                "#FFAB00"
+        ), colorArrayOf(
+                "#FFD180",
+                "#FFAB40",
+                "#FF9100",
+                "#FF6D00"
+        ), colorArrayOf(
+                "#FF9E80",
+                "#FF6E40",
+                "#FF3D00",
+                "#DD2C00"))
+    }
+
+    fun colorArrayOf(vararg colors: String) = colors.map { Color.parseColor(it) }.toIntArray()
+}
+
diff --git a/core/src/main/kotlin/ca/allanwang/kau/dialogs/color/ColorPickerDialog.kt b/core/src/main/kotlin/ca/allanwang/kau/dialogs/color/ColorPickerDialog.kt
new file mode 100644
index 0000000..7c57c26
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/dialogs/color/ColorPickerDialog.kt
@@ -0,0 +1,82 @@
+package ca.allanwang.kau.dialogs.color
+
+import android.content.Context
+import android.graphics.Color
+import android.support.annotation.DimenRes
+import android.support.annotation.StringRes
+import ca.allanwang.kau.R
+import ca.allanwang.kau.utils.string
+import com.afollestad.materialdialogs.MaterialDialog
+import com.afollestad.materialdialogs.Theme
+
+class ColorBuilder : ColorContract {
+    override var title: String? = null
+    override var titleRes: Int = -1
+    override var allowCustom: Boolean = true
+    override var allowCustomAlpha: Boolean = false
+    override var isAccent: Boolean = false
+    override var defaultColor: Int = Color.BLACK
+    override var doneText: Int = R.string.kau_done
+    override var backText: Int = R.string.kau_back
+    override var cancelText: Int = R.string.kau_cancel
+    override var presetText: Int = R.string.kau_md_presets
+    override var customText: Int = R.string.kau_md_custom
+        get() = if (allowCustom) field else 0
+    override var dynamicButtonColors: Boolean = true
+    override var circleSizeRes: Int = R.dimen.kau_color_circle_size
+    override var colorCallback: ((selectedColor: Int) -> Unit)? = null
+    override var colorsTop: IntArray? = null
+    override var colorsSub: Array<IntArray>? = null
+    override var theme: Theme? = null
+}
+
+interface ColorContract {
+    var title: String?
+    var titleRes: Int @StringRes set
+    var allowCustom: Boolean
+    var allowCustomAlpha: Boolean
+    var isAccent: Boolean
+    var defaultColor: Int @StringRes set
+    var doneText: Int @StringRes set
+    var backText: Int @StringRes set
+    var cancelText: Int @StringRes set
+    var presetText: Int
+        @StringRes set
+    var customText: Int @StringRes set
+    var dynamicButtonColors: Boolean
+    var circleSizeRes: Int @DimenRes set
+    var colorCallback: ((selectedColor: Int) -> Unit)?
+    var colorsTop: IntArray?
+    var colorsSub: Array<IntArray>?
+    var theme: Theme?
+}
+
+/**
+ * This is the extension that allows us to initialize the dialog
+ * Note that this returns just the dialog; you still need to call .show() to show it
+ */
+fun Context.colorPickerDialog(action: ColorContract.() -> Unit): MaterialDialog {
+    val b = ColorBuilder()
+    b.action()
+    return colorPickerDialog(b)
+}
+
+fun Context.colorPickerDialog(contract: ColorContract): MaterialDialog {
+    val view = ColorPickerView(this)
+    val dialog = with(MaterialDialog.Builder(this)) {
+        title(string(contract.titleRes, contract.title) ?: string(R.string.kau_md_color_palette))
+        customView(view, false)
+        autoDismiss(false)
+        positiveText(contract.doneText)
+        negativeText(contract.cancelText)
+        if (contract.allowCustom) neutralText(contract.presetText)
+        onPositive { dialog, _ -> contract.colorCallback?.invoke(view.selectedColor); dialog.dismiss() }
+        onNegative { _, _ -> view.backOrCancel() }
+        if (contract.allowCustom) onNeutral { _, _ -> view.toggleCustom() }
+        showListener { view.refreshColors() }
+        if (contract.theme != null) theme(contract.theme!!)
+        build()
+    }
+    view.bind(contract, dialog)
+    return dialog
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/dialogs/color/ColorPickerView.kt b/core/src/main/kotlin/ca/allanwang/kau/dialogs/color/ColorPickerView.kt
new file mode 100644
index 0000000..da864c9
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/dialogs/color/ColorPickerView.kt
@@ -0,0 +1,309 @@
+package ca.allanwang.kau.dialogs.color
+
+import android.content.Context
+import android.graphics.Color
+import android.support.annotation.ColorInt
+import android.support.v4.content.res.ResourcesCompat
+import android.text.Editable
+import android.text.InputFilter
+import android.text.TextWatcher
+import android.util.AttributeSet
+import android.view.View
+import android.view.ViewGroup
+import android.widget.*
+import ca.allanwang.kau.R
+import ca.allanwang.kau.utils.*
+import com.afollestad.materialdialogs.DialogAction
+import com.afollestad.materialdialogs.MaterialDialog
+import com.afollestad.materialdialogs.color.FillGridView
+import java.util.*
+
+/**
+ * Created by Allan Wang on 2017-06-08.
+ *
+ * ColorPicker component of the ColorPickerDialog
+ */
+internal class ColorPickerView @JvmOverloads constructor(
+        context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
+) : ScrollView(context, attrs, defStyleAttr) {
+    var selectedColor: Int = -1
+    var isInSub: Boolean = false
+    var isInCustom: Boolean = false
+    var circleSize: Int = context.dimen(R.dimen.kau_color_circle_size).toInt()
+    val backgroundColor = context.resolveColor(R.attr.md_background_color,
+            if (context.resolveColor(android.R.attr.textColorPrimary).isColorDark()) Color.WHITE else 0xff424242.toInt())
+    val backgroundColorTint = backgroundColor.colorToForeground()
+    lateinit var dialog: MaterialDialog
+    lateinit var builder: ColorContract
+    lateinit var colorsTop: IntArray
+    var colorsSub: Array<IntArray>? = null
+    var topIndex: Int = -1
+    var subIndex: Int = -1
+    var colorIndex: Int
+        get() = if (isInSub) subIndex else topIndex
+        set(value) {
+            if (isInSub) subIndex = value
+            else {
+                topIndex = value
+                if (colorsSub != null && colorsSub!!.size > value) {
+                    dialog.setActionButton(DialogAction.NEGATIVE, builder.backText)
+                    isInSub = true
+                    invalidateGrid()
+                }
+            }
+        }
+
+
+    val gridView: FillGridView by bindView(R.id.md_grid)
+    val customFrame: LinearLayout by bindView(R.id.md_colorChooserCustomFrame)
+    val customColorIndicator: View by bindView(R.id.md_colorIndicator)
+    val hexInput: EditText by bindView(R.id.md_hexInput)
+    val alphaLabel: TextView by bindView(R.id.md_colorALabel)
+    val alphaSeekbar: SeekBar by bindView(R.id.md_colorA)
+    val alphaValue: TextView by bindView(R.id.md_colorAValue)
+    val redSeekbar: SeekBar by bindView(R.id.md_colorR)
+    val redValue: TextView by bindView(R.id.md_colorRValue)
+    val greenSeekbar: SeekBar by bindView(R.id.md_colorG)
+    val greenValue: TextView by bindView(R.id.md_colorGValue)
+    val blueSeekbar: SeekBar by bindView(R.id.md_colorB)
+    val blueValue: TextView by bindView(R.id.md_colorBValue)
+
+    var customHexTextWatcher: TextWatcher? = null
+    var customRgbListener: SeekBar.OnSeekBarChangeListener? = null
+
+    init {
+        View.inflate(context, R.layout.md_dialog_colorchooser, this)
+    }
+
+    fun bind(builder: ColorContract, dialog: MaterialDialog) {
+        this.builder = builder
+        this.dialog = dialog
+        this.colorsTop = with(builder) {
+            if (colorsTop != null) colorsTop!!
+            else if (isAccent) ColorPalette.ACCENT_COLORS
+            else ColorPalette.PRIMARY_COLORS
+        }
+        this.colorsSub = with(builder) {
+            if (colorsTop != null) colorsSub
+            else if (isAccent) ColorPalette.ACCENT_COLORS_SUB
+            else ColorPalette.PRIMARY_COLORS_SUB
+        }
+        this.selectedColor = builder.defaultColor
+        if (builder.allowCustom) {
+            if (!builder.allowCustomAlpha) {
+                alphaLabel.gone()
+                alphaSeekbar.gone()
+                alphaValue.gone()
+                hexInput.hint = String.format("%06X", selectedColor)
+                hexInput.filters = arrayOf(InputFilter.LengthFilter(6))
+            } else {
+                hexInput.hint = String.format("%08X", selectedColor)
+                hexInput.filters = arrayOf(InputFilter.LengthFilter(8))
+            }
+        }
+        if (findColor(builder.defaultColor) || !builder.allowCustom) isInCustom = true //when toggled this will be false
+        toggleCustom()
+    }
+
+    fun backOrCancel() {
+        if (isInSub) {
+            dialog.setActionButton(DialogAction.NEGATIVE, builder.cancelText)
+            //to top
+            isInSub = false
+            subIndex = -1
+            invalidateGrid()
+        } else {
+            dialog.cancel()
+        }
+    }
+
+    fun toggleCustom() {
+        isInCustom = !isInCustom
+        if (isInCustom) {
+            isInSub = false
+            if (builder.allowCustom) dialog.setActionButton(DialogAction.NEUTRAL, builder.presetText)
+            dialog.setActionButton(DialogAction.NEGATIVE, builder.cancelText)
+            customHexTextWatcher = object : TextWatcher {
+                override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
+
+                override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {
+                    try {
+                        selectedColor = Color.parseColor("#" + s.toString())
+                    } catch (e: IllegalArgumentException) {
+                        selectedColor = Color.BLACK
+                    }
+
+                    customColorIndicator.setBackgroundColor(selectedColor)
+                    if (alphaSeekbar.isVisible()) {
+                        val alpha = Color.alpha(selectedColor)
+                        alphaSeekbar.progress = alpha
+                        alphaValue.text = String.format(Locale.CANADA, "%d", alpha)
+                    }
+                    redSeekbar.progress = Color.red(selectedColor)
+                    greenSeekbar.progress = Color.green(selectedColor)
+                    blueSeekbar.progress = Color.blue(selectedColor)
+                    isInSub = false
+                    topIndex = -1
+                    subIndex = -1
+                    refreshColors()
+                }
+
+                override fun afterTextChanged(s: Editable?) {}
+            }
+            hexInput.setText(selectedColor.toHexString(builder.allowCustomAlpha, false))
+            hexInput.addTextChangedListener(customHexTextWatcher)
+            customRgbListener = object : SeekBar.OnSeekBarChangeListener {
+                override fun onProgressChanged(seekBar: SeekBar, progress: Int, fromUser: Boolean) {
+                    if (fromUser) {
+                        val color = if (builder.allowCustomAlpha)
+                            Color.argb(alphaSeekbar.progress,
+                                    redSeekbar.progress,
+                                    greenSeekbar.progress,
+                                    blueSeekbar.progress)
+                        else Color.rgb(redSeekbar.progress,
+                                greenSeekbar.progress,
+                                blueSeekbar.progress)
+
+                        hexInput.setText(color.toHexString(builder.allowCustomAlpha, false))
+                    }
+                    if (builder.allowCustomAlpha) alphaValue.text = alphaSeekbar.progress.toString()
+                    redValue.text = redSeekbar.progress.toString()
+                    greenValue.text = greenSeekbar.progress.toString()
+                    blueValue.text = blueSeekbar.progress.toString()
+                }
+
+                override fun onStartTrackingTouch(seekBar: SeekBar) {}
+
+                override fun onStopTrackingTouch(seekBar: SeekBar) {}
+            }
+            redSeekbar.setOnSeekBarChangeListener(customRgbListener)
+            greenSeekbar.setOnSeekBarChangeListener(customRgbListener)
+            blueSeekbar.setOnSeekBarChangeListener(customRgbListener)
+            if (alphaSeekbar.isVisible())
+                alphaSeekbar.setOnSeekBarChangeListener(customRgbListener)
+            hexInput.setText(selectedColor.toHexString(alphaSeekbar.isVisible(), false))
+            gridView.fadeOut(onFinish = { gridView.gone() })
+            customFrame.fadeIn()
+        } else {
+            findColor(selectedColor)
+            if (builder.allowCustom) dialog.setActionButton(DialogAction.NEUTRAL, builder.customText)
+            dialog.setActionButton(DialogAction.NEGATIVE, if (isInSub) builder.backText else builder.cancelText)
+            gridView.fadeIn(onStart = { invalidateGrid() })
+            customFrame.fadeOut(onFinish = { customFrame.gone() })
+            hexInput.removeTextChangedListener(customHexTextWatcher)
+            customHexTextWatcher = null
+            alphaSeekbar.setOnSeekBarChangeListener(null)
+            redSeekbar.setOnSeekBarChangeListener(null)
+            greenSeekbar.setOnSeekBarChangeListener(null)
+            blueSeekbar.setOnSeekBarChangeListener(null)
+            customRgbListener = null
+        }
+    }
+
+    fun refreshColors() {
+        if (!isInCustom) findColor(selectedColor)
+        //Ensure that our tinted color is still visible against the background
+        val visibleColor = if (selectedColor.isColorVisibleOn(backgroundColor)) selectedColor else backgroundColorTint
+        if (builder.dynamicButtonColors) {
+            dialog.getActionButton(DialogAction.POSITIVE).setTextColor(visibleColor)
+            dialog.getActionButton(DialogAction.NEGATIVE).setTextColor(visibleColor)
+            dialog.getActionButton(DialogAction.NEUTRAL).setTextColor(visibleColor)
+        }
+        if (!builder.allowCustom || !isInCustom) return
+        if (builder.allowCustomAlpha)
+            alphaSeekbar.visible().tint(visibleColor)
+        redSeekbar.tint(visibleColor)
+        greenSeekbar.tint(visibleColor)
+        blueSeekbar.tint(visibleColor)
+        hexInput.tint(visibleColor)
+    }
+
+    fun findColor(@ColorInt color: Int): Boolean {
+        topIndex = -1
+        subIndex = -1
+        colorsTop.forEachIndexed {
+            index, topColor ->
+            if (findSubColor(color, index)) {
+                topIndex = index
+                return true
+            }
+            if (topColor == color) { // If no sub colors exists and top color matches
+                topIndex = index
+                return true
+            }
+        }
+        return false
+    }
+
+    fun findSubColor(@ColorInt color: Int, topIndex: Int): Boolean {
+        if (colorsSub == null || colorsSub!!.size <= topIndex) return false
+        colorsSub!![topIndex].forEachIndexed {
+            index, subColor ->
+            if (subColor == color) {
+                subIndex = index
+                return true
+            }
+        }
+        return false
+    }
+
+    fun invalidateGrid() {
+        if (gridView.adapter == null) {
+            gridView.adapter = ColorGridAdapter()
+            gridView.selector = ResourcesCompat.getDrawable(resources, R.drawable.kau_transparent, null)
+        } else {
+            (gridView.adapter as BaseAdapter).notifyDataSetChanged()
+        }
+    }
+
+    inner class ColorGridAdapter : BaseAdapter(), OnClickListener, OnLongClickListener {
+        override fun onClick(v: View) {
+            if (v.tag != null && v.tag is String) {
+                val tags = (v.tag as String).split(":")
+                if (colorIndex == tags[0].toInt()) {
+                    colorIndex = tags[0].toInt() //Go to sub list if exists
+                    return
+                }
+                if (colorIndex != -1) (gridView.getChildAt(colorIndex) as CircleView).animateSelected(false)
+                selectedColor = tags[1].toInt()
+                refreshColors()
+                val currentSub = isInSub
+                colorIndex = tags[0].toInt()
+                if (currentSub == isInSub) (gridView.getChildAt(colorIndex) as CircleView).animateSelected(true)
+                //Otherwise we are invalidating our grid, so there is no point in animating
+            }
+        }
+
+        override fun onLongClick(v: View): Boolean {
+            if (v.tag != null && v.tag is String) {
+                val tag = (v.tag as String).split(":")
+                val color = tag[1].toInt()
+                (v as CircleView).showHint(color)
+                return true
+            }
+            return false
+        }
+
+        override fun getItem(position: Int): Any = if (isInSub) colorsSub!![topIndex][position] else colorsTop[position]
+
+        override fun getCount(): Int = if (isInSub) colorsSub!![topIndex].size else colorsTop.size
+
+        override fun getItemId(position: Int): Long = position.toLong()
+
+        override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
+            val view: CircleView = if (convertView == null)
+                CircleView(context).apply { layoutParams = AbsListView.LayoutParams(circleSize, circleSize) }
+            else
+                convertView as CircleView
+            val color: Int = if (isInSub) colorsSub!![topIndex][position] else colorsTop[position]
+            return view.apply {
+                setBackgroundColor(color)
+                isSelected = colorIndex == position
+                tag = "$position:$color"
+                setOnClickListener(this@ColorGridAdapter)
+                setOnLongClickListener(this@ColorGridAdapter)
+            }
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/email/EmailBuilder.kt b/core/src/main/kotlin/ca/allanwang/kau/email/EmailBuilder.kt
new file mode 100644
index 0000000..b03a620
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/email/EmailBuilder.kt
@@ -0,0 +1,92 @@
+package ca.allanwang.kau.email
+
+import android.app.Activity
+import android.content.Context
+import android.content.Intent
+import android.content.pm.PackageManager
+import android.net.Uri
+import android.os.Build
+import android.support.annotation.StringRes
+import android.util.DisplayMetrics
+import ca.allanwang.kau.R
+import ca.allanwang.kau.logging.KL
+import ca.allanwang.kau.utils.installerPackageName
+import ca.allanwang.kau.utils.isAppInstalled
+import ca.allanwang.kau.utils.string
+
+
+/**
+ * Created by Allan Wang on 2017-06-20.
+ */
+class EmailBuilder(val email: String, val subject: String) {
+    var message: String = "Write here."
+    var deviceDetails: Boolean = true
+    var appInfo: Boolean = true
+    var footer: String? = null
+    private val pairs: MutableMap<String, String> = mutableMapOf()
+    private val packages: MutableList<Package> = mutableListOf()
+
+    fun checkPackage(packageName: String, appName: String) = packages.add(Package(packageName, appName))
+
+    fun addItem(key: String, value: String) = pairs.put(key, value)
+
+    data class Package(val packageName: String, val appName: String)
+
+    fun execute(context: Context) {
+        val intent = Intent(Intent.ACTION_VIEW, Uri.parse("mailto:$email"))
+        intent.putExtra(Intent.EXTRA_SUBJECT, subject)
+        val emailBuilder = StringBuilder()
+        emailBuilder.append(message).append("\n\n")
+        if (deviceDetails) {
+            val deviceItems = mutableMapOf(
+                    "OS Version" to "${System.getProperty("os.version")} (${Build.VERSION.INCREMENTAL})",
+                    "OS API Level" to Build.DEVICE,
+                    "Manufacturer" to Build.MANUFACTURER,
+                    "Model (and Product)" to "${Build.MODEL} (${Build.PRODUCT})",
+                    "Package Installer" to (context.installerPackageName ?: "None")
+            )
+            if (context is Activity) {
+                val metric = DisplayMetrics()
+                context.windowManager.defaultDisplay.getMetrics(metric)
+                deviceItems.put("Screen Dimensions", "${metric.widthPixels} x ${metric.heightPixels}")
+            }
+            deviceItems.forEach { (k, v) -> emailBuilder.append("$k: $v\n") }
+        }
+        if (appInfo) {
+            try {
+                val appInfo = context.packageManager.getPackageInfo(context.packageName, 0)
+                emailBuilder.append("\nApp: ").append(context.packageName)
+                        .append("\nApp Version Name: ").append(appInfo.versionName)
+                        .append("\nApp Version Code: ").append(appInfo.versionCode).append("\n")
+            } catch (e: PackageManager.NameNotFoundException) {
+                KL.e("EmailBuilder packageInfo not found")
+            }
+        }
+
+        if (packages.isNotEmpty()) emailBuilder.append("\n")
+        packages.forEach {
+            if (context.isAppInstalled(it.packageName))
+                emailBuilder.append(String.format("\n%s is installed", it.appName))
+        }
+
+        if (pairs.isNotEmpty()) emailBuilder.append("\n")
+        pairs.forEach { (k, v) -> emailBuilder.append("$k: $v\n") }
+
+        if (footer != null)
+            emailBuilder.append("\n").append(footer)
+
+        intent.putExtra(Intent.EXTRA_TEXT, emailBuilder.toString())
+        context.startActivity(Intent.createChooser(intent, context.resources.getString(R.string.kau_send_via)))
+    }
+}
+
+fun Context.sendEmail(@StringRes emailId: Int, @StringRes subjectId: Int, builder: EmailBuilder.() -> Unit = {})
+        = sendEmail(string(emailId), string(subjectId), builder)
+
+
+fun Context.sendEmail(email: String, subject: String, builder: EmailBuilder.() -> Unit = {}) {
+    EmailBuilder(email, subject).apply {
+        builder()
+        execute(this@sendEmail)
+    }
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/iitems/CardIItem.kt b/core/src/main/kotlin/ca/allanwang/kau/iitems/CardIItem.kt
new file mode 100644
index 0000000..3380ade
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/iitems/CardIItem.kt
@@ -0,0 +1,127 @@
+package ca.allanwang.kau.iitems
+
+import android.graphics.Color
+import android.graphics.drawable.Drawable
+import android.support.v7.widget.CardView
+import android.support.v7.widget.RecyclerView
+import android.view.View
+import android.widget.Button
+import android.widget.ImageView
+import android.widget.LinearLayout
+import android.widget.TextView
+import ca.allanwang.kau.R
+import ca.allanwang.kau.adapters.ThemableIItem
+import ca.allanwang.kau.adapters.ThemableIItemDelegate
+import ca.allanwang.kau.utils.*
+import com.mikepenz.fastadapter.FastAdapter
+import com.mikepenz.fastadapter.IItem
+import com.mikepenz.fastadapter.items.AbstractItem
+import com.mikepenz.fastadapter.listeners.ClickEventHook
+import com.mikepenz.iconics.typeface.IIcon
+
+/**
+ * Created by Allan Wang on 2017-06-28.
+ *
+ * Simple generic card item with an icon, title, description and button
+ * The icon and button are hidden by default unless values are given
+ */
+class CardIItem(val builder: Config.() -> Unit = {}
+) : AbstractItem<CardIItem, CardIItem.ViewHolder>(), ThemableIItem by ThemableIItemDelegate() {
+
+    companion object {
+        @JvmStatic fun bindClickEvents(fastAdapter: FastAdapter<IItem<*,*>>) {
+            fastAdapter.withEventHook(object : ClickEventHook<IItem<*,*>>() {
+                override fun onBindMany(viewHolder: RecyclerView.ViewHolder): List<View>? {
+                    return if (viewHolder is ViewHolder) listOf(viewHolder.card, viewHolder.button) else null
+                }
+
+                override fun onClick(v: View, position: Int, adapter: FastAdapter<IItem<*,*>>, item: IItem<*,*>) {
+                    if (item !is CardIItem) return
+                    with(item.configs) {
+                        when (v.id) {
+                            R.id.kau_card_container -> cardClick?.onClick(v)
+                            R.id.kau_card_button -> buttonClick?.onClick(v)
+                            else -> {
+                            }
+                        }
+                    }
+                }
+            })
+        }
+    }
+
+    val configs = Config().apply { builder() }
+
+    class Config {
+        var title: String? = null
+        var titleRes: Int = -1
+        var desc: String? = null
+        var descRes: Int = -1
+        var button: String? = null
+        var buttonRes: Int = -1
+        var buttonClick: View.OnClickListener? = null
+        var cardClick: View.OnClickListener? = null
+        var image: Drawable? = null
+        var imageIIcon: IIcon? = null
+        var imageIIconColor: Int = Color.WHITE
+        var imageRes: Int = -1
+    }
+
+
+    override fun getType(): Int = R.id.kau_item_card
+
+    override fun getLayoutRes(): Int = R.layout.kau_iitem_card
+
+    override fun bindView(holder: ViewHolder, payloads: MutableList<Any>?) {
+        super.bindView(holder, payloads)
+        with(holder.itemView.context) context@ {
+            with(configs) {
+                holder.title.text = string(titleRes, title)
+                holder.description.text = string(descRes, desc)
+                val buttonText = string(buttonRes, button)
+                if (buttonText != null) {
+                    holder.bottomRow.visible()
+                    holder.button.text = buttonText
+                    holder.button.setOnClickListener(buttonClick)
+                }
+                holder.icon.setImageDrawable(
+                        if (imageRes > 0) drawable(imageRes)
+                        else if (imageIIcon != null) imageIIcon!!.toDrawable(this@context, sizeDp = 40, color = imageIIconColor)
+                        else image
+                )
+                holder.card.setOnClickListener(cardClick)
+            }
+            with(holder) {
+                bindTextColor(title)
+                bindTextColorSecondary(description)
+                bindAccentColor(button)
+                if (configs.imageIIcon != null) bindIconColor(icon)
+                bindBackgroundRipple(card)
+            }
+        }
+    }
+
+    override fun unbindView(holder: ViewHolder) {
+        super.unbindView(holder)
+        with(holder) {
+            icon.gone().setImageDrawable(null)
+            title.text = null
+            description.text = null
+            bottomRow.gone()
+            button.setOnClickListener(null)
+            card.setOnClickListener(null)
+        }
+    }
+
+    override fun getViewHolder(v: View): ViewHolder = ViewHolder(v)
+
+    class ViewHolder(v: View) : RecyclerView.ViewHolder(v) {
+        val card: CardView by bindView(R.id.kau_card_container)
+        val icon: ImageView by bindView(R.id.kau_card_image)
+        val title: TextView by bindView(R.id.kau_card_title)
+        val description: TextView by bindView(R.id.kau_card_description)
+        val bottomRow: LinearLayout by bindView(R.id.kau_card_bottom_row)
+        val button: Button by bindView(R.id.kau_card_button)
+    }
+
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/iitems/CutoutIItem.kt b/core/src/main/kotlin/ca/allanwang/kau/iitems/CutoutIItem.kt
new file mode 100644
index 0000000..627e1df
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/iitems/CutoutIItem.kt
@@ -0,0 +1,48 @@
+package ca.allanwang.kau.iitems
+
+import android.support.v7.widget.RecyclerView
+import android.view.View
+import ca.allanwang.kau.R
+import ca.allanwang.kau.adapters.ThemableIItem
+import ca.allanwang.kau.adapters.ThemableIItemDelegate
+import ca.allanwang.kau.utils.bindView
+import ca.allanwang.kau.views.CutoutView
+import com.mikepenz.fastadapter.items.AbstractItem
+
+/**
+ * Created by Allan Wang on 2017-06-28.
+ *
+ * Just a cutout item with some defaults in [R.layout.kau_iitem_cutout]
+ */
+class CutoutIItem(val config: CutoutView.() -> Unit = {}
+) : AbstractItem<CutoutIItem, CutoutIItem.ViewHolder>(), ThemableIItem by ThemableIItemDelegate() {
+
+    override fun getType(): Int = R.id.kau_item_cutout
+
+    override fun getLayoutRes(): Int = R.layout.kau_iitem_cutout
+
+    override fun isSelectable(): Boolean = false
+
+    override fun bindView(holder: ViewHolder, payloads: MutableList<Any>?) {
+        super.bindView(holder, payloads)
+        with(holder) {
+            if (accentColor != null && themeEnabled) cutout.foregroundColor = accentColor!!
+            cutout.config()
+        }
+    }
+
+    override fun unbindView(holder: ViewHolder) {
+        super.unbindView(holder)
+        with(holder) {
+            cutout.drawable = null
+            cutout.text = "Text" //back to default
+        }
+    }
+
+    override fun getViewHolder(v: View): ViewHolder = ViewHolder(v)
+
+    class ViewHolder(v: View) : RecyclerView.ViewHolder(v) {
+        val cutout: CutoutView by bindView(R.id.kau_cutout)
+    }
+
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/iitems/HeaderIItem.kt b/core/src/main/kotlin/ca/allanwang/kau/iitems/HeaderIItem.kt
new file mode 100644
index 0000000..e994781
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/iitems/HeaderIItem.kt
@@ -0,0 +1,49 @@
+package ca.allanwang.kau.iitems
+
+import android.support.v7.widget.CardView
+import android.support.v7.widget.RecyclerView
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import ca.allanwang.kau.R
+import ca.allanwang.kau.adapters.ThemableIItem
+import ca.allanwang.kau.adapters.ThemableIItemDelegate
+import ca.allanwang.kau.utils.bindView
+import ca.allanwang.kau.utils.string
+import com.mikepenz.fastadapter.items.AbstractItem
+
+/**
+ * Created by Allan Wang on 2017-06-28.
+ *
+ * Simple Header with lots of padding on the top
+ * Contains only one text view
+ */
+class HeaderIItem(text: String? = null, var textRes: Int = -1
+) : AbstractItem<HeaderIItem, HeaderIItem.ViewHolder>(), ThemableIItem by ThemableIItemDelegate() {
+
+    var text: String = text ?: "Header Placeholder"
+
+    override fun getType(): Int = R.id.kau_item_header_big_margin_top
+
+    override fun getLayoutRes(): Int = R.layout.kau_iitem_header
+
+    override fun bindView(holder: ViewHolder, payloads: MutableList<Any>?) {
+        super.bindView(holder, payloads)
+        holder.text.text = holder.itemView.context.string(textRes, text)
+        bindTextColor(holder.text)
+        bindBackgroundColor(holder.container)
+    }
+
+    override fun unbindView(holder: ViewHolder) {
+        super.unbindView(holder)
+        holder.text.text = null
+    }
+
+    override fun getViewHolder(v: View): ViewHolder = ViewHolder(v)
+
+    class ViewHolder(v: View) : RecyclerView.ViewHolder(v) {
+        val text: TextView by bindView(R.id.kau_header_text)
+        val container: CardView by bindView(R.id.kau_header_container)
+    }
+
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/iitems/KauIItem.kt b/core/src/main/kotlin/ca/allanwang/kau/iitems/KauIItem.kt
new file mode 100644
index 0000000..00b165c
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/iitems/KauIItem.kt
@@ -0,0 +1,23 @@
+package ca.allanwang.kau.iitems
+
+import android.support.annotation.LayoutRes
+import android.support.v7.widget.RecyclerView
+import android.view.View
+import com.mikepenz.fastadapter.IClickable
+import com.mikepenz.fastadapter.IItem
+import com.mikepenz.fastadapter.items.AbstractItem
+
+/**
+ * Created by Allan Wang on 2017-07-03.
+ *
+ * Kotlin implementation of the [AbstractItem] to make things shorter
+ */
+open class KauIItem<Item, VH : RecyclerView.ViewHolder>(
+        private val type: Int,
+        @param:LayoutRes private val layoutRes: Int,
+        private val viewHolder: (v: View) -> VH
+) : AbstractItem<Item, VH>() where Item : IItem<*, *>, Item : IClickable<*> {
+    override final fun getType(): Int = type
+    override final fun getViewHolder(v: View): VH = viewHolder(v)
+    override final fun getLayoutRes(): Int = layoutRes
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/iitems/LibraryIItem.kt b/core/src/main/kotlin/ca/allanwang/kau/iitems/LibraryIItem.kt
new file mode 100644
index 0000000..aabd9e3
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/iitems/LibraryIItem.kt
@@ -0,0 +1,100 @@
+package ca.allanwang.kau.iitems
+
+import android.os.Build
+import android.support.v7.widget.CardView
+import android.support.v7.widget.RecyclerView
+import android.text.Html
+import android.view.View
+import android.widget.TextView
+import ca.allanwang.kau.R
+import ca.allanwang.kau.adapters.ThemableIItem
+import ca.allanwang.kau.adapters.ThemableIItemDelegate
+import ca.allanwang.kau.utils.bindView
+import ca.allanwang.kau.utils.gone
+import ca.allanwang.kau.utils.startLink
+import ca.allanwang.kau.utils.visible
+import ca.allanwang.kau.views.createSimpleRippleDrawable
+import com.mikepenz.aboutlibraries.entity.Library
+import com.mikepenz.fastadapter.FastAdapter
+import com.mikepenz.fastadapter.IItem
+import com.mikepenz.fastadapter.items.AbstractItem
+
+/**
+ * Created by Allan Wang on 2017-06-27.
+ */
+class LibraryIItem(val lib: Library
+) : AbstractItem<LibraryIItem, LibraryIItem.ViewHolder>(), ThemableIItem by ThemableIItemDelegate() {
+
+    companion object {
+        @JvmStatic fun bindClickEvents(fastAdapter: FastAdapter<IItem<*, *>>) {
+            fastAdapter.withOnClickListener { v, _, item, _ ->
+                if (item !is LibraryIItem) false
+                else {
+                    val c = v.context
+                    with(item.lib) {
+                        c.startLink(libraryWebsite, repositoryLink, authorWebsite)
+                    }
+                    true
+                }
+            }
+        }
+    }
+
+    override fun getType(): Int = R.id.kau_item_library
+
+    override fun getLayoutRes(): Int = R.layout.kau_iitem_library
+
+    override fun isSelectable(): Boolean = false
+
+    override fun bindView(holder: ViewHolder, payloads: MutableList<Any>?) {
+        super.bindView(holder, payloads)
+        with(holder) {
+            name.text = lib.libraryName
+            creator.text = lib.author
+            description.text = if (lib.libraryDescription.isBlank()) lib.libraryDescription
+            else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
+                Html.fromHtml(lib.libraryDescription, Html.FROM_HTML_MODE_LEGACY)
+            else Html.fromHtml(lib.libraryDescription)
+            bottomDivider.gone()
+            if (lib.libraryVersion?.isNotBlank() ?: false) {
+                bottomDivider.visible()
+                version.visible().text = lib.libraryVersion
+            }
+            if (lib.license?.licenseName?.isNotBlank() ?: false) {
+                bottomDivider.visible()
+                license.visible().text = lib.license?.licenseName
+            }
+            bindTextColor(name, creator)
+            bindTextColorSecondary(description)
+            bindAccentColor(license, version)
+            bindDividerColor(divider, bottomDivider)
+            bindBackgroundRipple(card)
+        }
+    }
+
+    override fun unbindView(holder: ViewHolder) {
+        super.unbindView(holder)
+        with(holder) {
+            name.text = null
+            creator.text = null
+            description.text = null
+            bottomDivider.gone()
+            version.gone().text = null
+            license.gone().text = null
+        }
+    }
+
+    override fun getViewHolder(v: View): ViewHolder = ViewHolder(v)
+
+    class ViewHolder(v: View) : RecyclerView.ViewHolder(v) {
+        val card: CardView by bindView(R.id.lib_item_card)
+        val name: TextView by bindView(R.id.lib_item_name)
+        val creator: TextView by bindView(R.id.lib_item_author)
+        val description: TextView by bindView(R.id.lib_item_description)
+        val version: TextView by bindView(R.id.lib_item_version)
+        val license: TextView by bindView(R.id.lib_item_license)
+        val divider: View by bindView(R.id.lib_item_top_divider)
+        val bottomDivider: View by bindView(R.id.lib_item_bottom_divider)
+    }
+
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kotlin/LazyContext.kt b/core/src/main/kotlin/ca/allanwang/kau/kotlin/LazyContext.kt
new file mode 100644
index 0000000..8b59539
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/kotlin/LazyContext.kt
@@ -0,0 +1,50 @@
+package ca.allanwang.kau.kotlin
+
+import android.content.Context
+import android.support.annotation.AnimatorRes
+import android.support.annotation.InterpolatorRes
+import android.view.animation.Animation
+import android.view.animation.AnimationUtils
+import android.view.animation.Interpolator
+
+/**
+ * Created by Allan Wang on 2017-05-30.
+ *
+ * Lazy retrieval of context based items
+ * Items are retrieved using delegateName[context]
+ *
+ */
+
+fun lazyInterpolator(@InterpolatorRes id: Int) = lazyContext<Interpolator> { AnimationUtils.loadInterpolator(it, id) }
+fun lazyAnimation(@AnimatorRes id: Int) = lazyContext<Animation> { AnimationUtils.loadAnimation(it, id) }
+
+fun <T : Any> lazyContext(initializer: (context: Context) -> T): LazyContext<T> = LazyContext<T>(initializer)
+
+class LazyContext<out T : Any>(private val initializer: (context: Context) -> T, lock: Any? = null) {
+    @Volatile private var _value: Any = UNINITIALIZED
+    private val lock = lock ?: this
+
+    fun invalidate() {
+        _value = UNINITIALIZED
+    }
+
+    operator fun invoke(context: Context): T {
+        val _v1 = _value
+        if (_v1 !== UNINITIALIZED)
+            @Suppress("UNCHECKED_CAST")
+            return _v1 as T
+
+        return synchronized(lock) {
+            val _v2 = _value
+            if (_v2 !== UNINITIALIZED) {
+                @Suppress("UNCHECKED_CAST")
+                _v2 as T
+            } else {
+                val typedValue = initializer(context)
+                _value = typedValue
+                typedValue
+            }
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kotlin/LazyResettable.kt b/core/src/main/kotlin/ca/allanwang/kau/kotlin/LazyResettable.kt
new file mode 100644
index 0000000..f8947f3
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/kotlin/LazyResettable.kt
@@ -0,0 +1,51 @@
+package ca.allanwang.kau.kotlin
+
+import java.io.Serializable
+import kotlin.reflect.KProperty
+
+/**
+ * Created by Allan Wang on 2017-05-30.
+ *
+ * Lazy delegate that can be invalidated if needed
+ * https://stackoverflow.com/a/37294840/4407321
+ */
+internal object UNINITIALIZED
+
+fun <T : Any> lazyResettable(initializer: () -> T): LazyResettable<T> = LazyResettable<T>(initializer)
+
+class LazyResettable<T : Any>(private val initializer: () -> T, lock: Any? = null) : Lazy<T>, Serializable {
+    @Volatile private var _value: Any = UNINITIALIZED
+    private val lock = lock ?: this
+
+    fun invalidate() {
+        _value = UNINITIALIZED
+    }
+
+    override val value: T
+        get() {
+            val _v1 = _value
+            if (_v1 !== UNINITIALIZED)
+                @Suppress("UNCHECKED_CAST")
+                return _v1 as T
+
+            return synchronized(lock) {
+                val _v2 = _value
+                if (_v2 !== UNINITIALIZED) {
+                    @Suppress("UNCHECKED_CAST")
+                    _v2 as T
+                } else {
+                    val typedValue = initializer()
+                    _value = typedValue
+                    typedValue
+                }
+            }
+        }
+
+    override fun isInitialized(): Boolean = _value !== UNINITIALIZED
+
+    override fun toString(): String = if (isInitialized()) value.toString() else "Lazy value not initialized yet."
+
+    operator fun setValue(any: Any, property: KProperty<*>, t: T) {
+        _value = t
+    }
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kotlin/NonReadablePropertyException.kt b/core/src/main/kotlin/ca/allanwang/kau/kotlin/NonReadablePropertyException.kt
new file mode 100644
index 0000000..f3add48
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/kotlin/NonReadablePropertyException.kt
@@ -0,0 +1,12 @@
+package ca.allanwang.kau.kotlin
+
+/**
+ * Created by Allan Wang on 2017-06-24.
+ *
+ * Credits to @zsmb13
+ *
+ * https://github.com/zsmb13/MaterialDrawerKt/blob/master/library/src/main/java/co/zsmb/materialdrawerkt/NonReadablePropertyException.kt
+ */
+class NonReadablePropertyException : Exception()
+
+fun nonReadable(): Nothing = throw NonReadablePropertyException()
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kpref/KPref.kt b/core/src/main/kotlin/ca/allanwang/kau/kpref/KPref.kt
new file mode 100644
index 0000000..7fd8955
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/kpref/KPref.kt
@@ -0,0 +1,35 @@
+package ca.allanwang.kau.kpref
+
+import android.content.Context
+import android.content.SharedPreferences
+
+/**
+ * Created by Allan Wang on 2017-06-07.
+ */
+open class KPref {
+
+    lateinit private var c: Context
+    lateinit internal var PREFERENCE_NAME: String
+    private var initialized = false
+
+    fun initialize(c: Context, preferenceName: String) {
+        if (initialized) throw KPrefException("KPref object $preferenceName has already been initialized; please only do so once")
+        initialized = true
+        this.c = c.applicationContext
+        PREFERENCE_NAME = preferenceName
+    }
+
+    internal val sp: SharedPreferences by lazy {
+        if (!initialized) throw KPrefException("KPref object has not yet been initialized; please initialize it with a context and preference name")
+        c.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE)
+    }
+
+    internal val prefMap: MutableMap<String, KPrefDelegate<*>> = mutableMapOf()
+
+    fun reset() {
+        prefMap.values.forEach { it.invalidate() }
+    }
+
+    operator fun get(key: String): KPrefDelegate<*>? = prefMap[key]
+
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefActivity.kt b/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefActivity.kt
new file mode 100644
index 0000000..9a9f7d4
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefActivity.kt
@@ -0,0 +1,137 @@
+package ca.allanwang.kau.kpref
+
+import android.os.Bundle
+import android.support.annotation.StringRes
+import android.support.constraint.ConstraintLayout
+import android.support.v7.app.AppCompatActivity
+import android.support.v7.widget.RecyclerView
+import android.support.v7.widget.Toolbar
+import android.view.View
+import android.view.animation.Animation
+import android.view.animation.AnimationUtils
+import android.widget.FrameLayout
+import android.widget.ViewAnimator
+import ca.allanwang.kau.R
+import ca.allanwang.kau.kpref.items.KPrefItemCore
+import ca.allanwang.kau.utils.bindView
+import ca.allanwang.kau.utils.resolveColor
+import ca.allanwang.kau.utils.statusBarColor
+import ca.allanwang.kau.utils.string
+import ca.allanwang.kau.widgets.TextSlider
+import ca.allanwang.kau.views.RippleCanvas
+import com.mikepenz.fastadapter.commons.adapters.FastItemAdapter
+
+abstract class KPrefActivity : AppCompatActivity(), KPrefActivityContract {
+
+    val adapter: FastItemAdapter<KPrefItemCore>
+        @Suppress("UNCHECKED_CAST")
+        get() = recycler.adapter as FastItemAdapter<KPrefItemCore>
+    val recycler: RecyclerView
+        get() = prefHolder.currentView as RecyclerView
+    val container: ConstraintLayout by bindView(R.id.kau_container)
+    val bgCanvas: RippleCanvas by bindView(R.id.kau_ripple)
+    val toolbarCanvas: RippleCanvas by bindView(R.id.kau_toolbar_ripple)
+    val toolbar: Toolbar by bindView(R.id.kau_toolbar)
+    val toolbarTitle: TextSlider by bindView(R.id.kau_toolbar_text)
+    val prefHolder: ViewAnimator by bindView(R.id.kau_holder)
+    private lateinit var globalOptions: GlobalOptions
+    var animate: Boolean = true
+        set(value) {
+            field = value
+            toolbarTitle.animationType = if (value) TextSlider.ANIMATION_SLIDE_HORIZONTAL else TextSlider.ANIMATION_NONE
+        }
+
+    private val SLIDE_IN_LEFT_ITEMS: Animation by lazy { AnimationUtils.loadAnimation(this, R.anim.kau_slide_in_left) }
+    private val SLIDE_IN_RIGHT_ITEMS: Animation by lazy { AnimationUtils.loadAnimation(this, R.anim.kau_slide_in_right) }
+    private val SLIDE_OUT_LEFT_ITEMS: Animation by lazy { AnimationUtils.loadAnimation(this, R.anim.kau_slide_out_left) }
+    private val SLIDE_OUT_RIGHT_ITEMS: Animation by lazy { AnimationUtils.loadAnimation(this, R.anim.kau_slide_out_right) }
+
+    /**
+     * Core attribute builder that is consistent throughout all items
+     * Leave blank to use defaults
+     */
+    abstract fun kPrefCoreAttributes(): CoreAttributeContract.() -> Unit
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        //setup layout
+        setContentView(R.layout.kau_activity_kpref)
+        setSupportActionBar(toolbar)
+        if (supportActionBar != null)
+            with(supportActionBar!!) {
+                setDisplayHomeAsUpEnabled(true)
+                setDisplayShowHomeEnabled(true)
+                toolbar.setNavigationOnClickListener { onBackPressed() }
+                setDisplayShowTitleEnabled(false)
+            }
+        window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_LAYOUT_STABLE or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+        statusBarColor = 0x30000000
+        toolbarCanvas.set(resolveColor(R.attr.colorPrimary))
+        bgCanvas.set(resolveColor(android.R.attr.colorBackground))
+        prefHolder.animateFirstView = false
+        //setup prefs
+        val core = CoreAttributeBuilder()
+        val builder = kPrefCoreAttributes()
+        core.builder()
+        globalOptions = GlobalOptions(core, this)
+        showNextPrefs(R.string.kau_settings, onCreateKPrefs(savedInstanceState))
+    }
+
+    override fun onPostCreate(savedInstanceState: Bundle?) {
+        super.onPostCreate(savedInstanceState)
+    }
+
+    override fun showNextPrefs(@StringRes toolbarTitleRes: Int, builder: KPrefAdapterBuilder.() -> Unit) {
+        val rv = RecyclerView(this).apply {
+            layoutParams = FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT)
+            setKPrefAdapter(globalOptions, builder)
+        }
+        with(prefHolder) {
+            inAnimation = if (animate) SLIDE_IN_RIGHT_ITEMS else null
+            outAnimation = if (animate) SLIDE_OUT_LEFT_ITEMS else null
+            addView(rv)
+            showNext()
+        }
+        toolbarTitle.setNextText(string(toolbarTitleRes))
+    }
+
+    override fun showPrevPrefs() {
+        val current = prefHolder.currentView
+        with(prefHolder) {
+            inAnimation = if (animate) SLIDE_IN_LEFT_ITEMS else null
+            outAnimation = if (animate) SLIDE_OUT_RIGHT_ITEMS else null
+            showPrevious()
+            removeView(current)
+            adapter.notifyAdapterDataSetChanged()
+        }
+        toolbarTitle.setPrevText()
+    }
+
+    fun reload(vararg index: Int) {
+        if (index.isEmpty()) adapter.notifyAdapterDataSetChanged()
+        else index.forEach { adapter.notifyItemChanged(it) }
+    }
+
+    override fun reloadByTitle(@StringRes vararg title: Int) {
+        if (title.isEmpty()) return
+        adapter.adapterItems.forEachIndexed { index, item ->
+            if (title.any { item.core.titleRes == it })
+                adapter.notifyItemChanged(index)
+        }
+    }
+
+    abstract fun onCreateKPrefs(savedInstanceState: Bundle?): KPrefAdapterBuilder.() -> Unit
+
+    override fun onBackPressed() {
+        if (!backPress()) super.onBackPressed()
+    }
+
+    fun backPress(): Boolean {
+        if (!toolbarTitle.isRoot) {
+            showPrevPrefs()
+            return true
+        }
+        return false
+    }
+}
+
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefBinder.kt b/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefBinder.kt
new file mode 100644
index 0000000..7f42d2a
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefBinder.kt
@@ -0,0 +1,120 @@
+package ca.allanwang.kau.kpref
+
+import android.support.annotation.StringRes
+import android.support.v7.widget.LinearLayoutManager
+import android.support.v7.widget.RecyclerView
+import ca.allanwang.kau.R
+import ca.allanwang.kau.kpref.items.*
+import com.mikepenz.fastadapter.commons.adapters.FastItemAdapter
+import org.jetbrains.anko.doAsync
+import org.jetbrains.anko.uiThread
+
+/**
+ * Created by Allan Wang on 2017-06-08.
+ *
+ * Houses all the components that can be called externally to setup the kpref mainAdapter
+ */
+
+/**
+ * Base extension that will register the layout manager and mainAdapter with the given items
+ * Returns FastAdapter
+ */
+fun RecyclerView.setKPrefAdapter(globalOptions: GlobalOptions, builder: KPrefAdapterBuilder.() -> Unit): FastItemAdapter<KPrefItemCore> {
+    layoutManager = LinearLayoutManager(context)
+    val adapter = FastItemAdapter<KPrefItemCore>()
+    adapter.withOnClickListener { v, _, item, _ -> item.onClick(v, v.findViewById(R.id.kau_pref_inner_content)) }
+    this.adapter = adapter
+    doAsync {
+        val items = KPrefAdapterBuilder(globalOptions)
+        builder.invoke(items)
+        uiThread {
+            adapter.add(items.list)
+        }
+    }
+    return adapter
+}
+
+@DslMarker
+annotation class KPrefMarker
+
+/**
+ * Contains attributes shared amongst all kpref items
+ */
+@KPrefMarker
+interface CoreAttributeContract {
+    var textColor: (() -> Int)?
+    var accentColor: (() -> Int)?
+}
+
+/**
+ * Implementation of [CoreAttributeContract]
+ */
+class CoreAttributeBuilder : CoreAttributeContract {
+    override var textColor: (() -> Int)? = null
+    override var accentColor: (() -> Int)? = textColor
+}
+
+interface KPrefActivityContract {
+    fun showNextPrefs(@StringRes toolbarTitleRes: Int, builder: KPrefAdapterBuilder.() -> Unit)
+    fun showPrevPrefs()
+    fun reloadByTitle(@StringRes vararg title: Int)
+}
+
+
+class GlobalOptions(core: CoreAttributeContract, activity: KPrefActivityContract
+) : CoreAttributeContract by core, KPrefActivityContract by activity
+
+
+/**
+ * Builder for kpref items
+ * Contains DSLs for every possible item
+ * The arguments are all the mandatory values plus an optional builder housing all the possible configurations
+ * The mandatory values are final so they cannot be edited in the builder
+ */
+@KPrefMarker
+class KPrefAdapterBuilder(internal val globalOptions: GlobalOptions) {
+
+    @KPrefMarker
+    fun header(@StringRes title: Int)
+            = list.add(KPrefHeader(KPrefItemCore.CoreBuilder(globalOptions, title)))
+
+    @KPrefMarker
+    fun checkbox(@StringRes title: Int,
+                 getter: (() -> Boolean),
+                 setter: ((value: Boolean) -> Unit),
+                 builder: KPrefItemBase.BaseContract<Boolean>.() -> Unit = {})
+            = list.add(KPrefCheckbox(KPrefItemBase.BaseBuilder(globalOptions, title, getter, setter)
+            .apply { builder() }))
+
+    @KPrefMarker
+    fun colorPicker(@StringRes title: Int,
+                    getter: (() -> Int),
+                    setter: ((value: Int) -> Unit),
+                    builder: KPrefColorPicker.KPrefColorContract.() -> Unit = {})
+            = list.add(KPrefColorPicker(KPrefColorPicker.KPrefColorBuilder(globalOptions, title, getter, setter)
+            .apply { builder() }))
+
+    @KPrefMarker
+    fun <T> text(@StringRes title: Int,
+                 getter: (() -> T),
+                 setter: ((value: T) -> Unit),
+                 builder: KPrefText.KPrefTextContract<T>.() -> Unit = {})
+            = list.add(KPrefText<T>(KPrefText.KPrefTextBuilder<T>(globalOptions, title, getter, setter)
+            .apply { builder() }))
+
+    @KPrefMarker
+    fun subItems(@StringRes title: Int,
+                 itemBuilder: KPrefAdapterBuilder.() -> Unit,
+                 builder: KPrefSubItems.KPrefSubItemsContract.() -> Unit)
+            = list.add(KPrefSubItems(KPrefSubItems.KPrefSubItemsBuilder(globalOptions, title, itemBuilder)
+            .apply { builder() }))
+
+    @KPrefMarker
+    fun plainText(@StringRes title: Int,
+                  builder: KPrefItemBase.BaseContract<Unit>.() -> Unit = {})
+            = list.add(KPrefPlainText(KPrefPlainText.KPrefPlainTextBuilder(globalOptions, title)
+            .apply { builder() }))
+
+    @KPrefMarker
+    internal val list: MutableList<KPrefItemCore> = mutableListOf()
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefDelegate.kt b/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefDelegate.kt
new file mode 100644
index 0000000..4d57ff1
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefDelegate.kt
@@ -0,0 +1,89 @@
+package ca.allanwang.kau.kpref
+
+/**
+ * Created by Allan Wang on 2017-06-07.
+ */
+private object UNINITIALIZED
+
+fun KPref.kpref(key: String, fallback: Boolean, postSetter: (value: Boolean) -> Unit = {}): KPrefDelegate<Boolean> = KPrefDelegate(key, fallback, this, postSetter)
+fun KPref.kpref(key: String, fallback: Double, postSetter: (value: Float) -> Unit = {}): KPrefDelegate<Float> = KPrefDelegate(key, fallback.toFloat(), this, postSetter)
+fun KPref.kpref(key: String, fallback: Float, postSetter: (value: Float) -> Unit = {}): KPrefDelegate<Float> = KPrefDelegate(key, fallback, this, postSetter)
+fun KPref.kpref(key: String, fallback: Int, postSetter: (value: Int) -> Unit = {}): KPrefDelegate<Int> = KPrefDelegate(key, fallback, this, postSetter)
+fun KPref.kpref(key: String, fallback: Long, postSetter: (value: Long) -> Unit = {}): KPrefDelegate<Long> = KPrefDelegate(key, fallback, this, postSetter)
+fun KPref.kpref(key: String, fallback: Set<String>, postSetter: (value: Set<String>) -> Unit = {}): KPrefDelegate<StringSet> = KPrefDelegate(key, StringSet(fallback), this, postSetter)
+fun KPref.kpref(key: String, fallback: String, postSetter: (value: String) -> Unit = {}): KPrefDelegate<String> = KPrefDelegate(key, fallback, this, postSetter)
+
+class StringSet(set: Collection<String>) : LinkedHashSet<String>(set)
+
+/**
+ * Implementation of a kpref data item
+ * Contains a unique key for the shared preference as well as a nonnull fallback item
+ * Also contains an optional mutable postSetter that will be called every time a new value is given
+ */
+class KPrefDelegate<T : Any> internal constructor(private val key: String, private val fallback: T, private val pref: KPref, var postSetter: (value: T) -> Unit = {}, lock: Any? = null) : Lazy<T>, java.io.Serializable {
+
+    @Volatile private var _value: Any = UNINITIALIZED
+    private val lock = lock ?: this
+
+    init {
+        if (pref.prefMap.containsKey(key))
+            throw KPrefException("$key is already used elsewhere in preference ${pref.PREFERENCE_NAME}")
+        pref.prefMap.put(key, this@KPrefDelegate)
+    }
+
+    fun invalidate() {
+        _value = UNINITIALIZED
+    }
+
+    override val value: T
+        get() {
+            val _v1 = _value
+            if (_v1 !== UNINITIALIZED)
+                @Suppress("UNCHECKED_CAST")
+                return _v1 as T
+
+            return synchronized(lock) {
+                val _v2 = _value
+                if (_v2 !== UNINITIALIZED) {
+                    @Suppress("UNCHECKED_CAST")
+                    _v2 as T
+                } else {
+                    _value = when (fallback) {
+                        is Boolean -> pref.sp.getBoolean(key, fallback)
+                        is Float -> pref.sp.getFloat(key, fallback)
+                        is Int -> pref.sp.getInt(key, fallback)
+                        is Long -> pref.sp.getLong(key, fallback)
+                        is StringSet -> StringSet(pref.sp.getStringSet(key, fallback))
+                        is String -> pref.sp.getString(key, fallback)
+                        else -> throw KPrefException(fallback)
+                    }
+                    @Suppress("UNCHECKED_CAST")
+                    _value as T
+                }
+            }
+        }
+
+    override fun isInitialized(): Boolean = _value !== UNINITIALIZED
+
+    override fun toString(): String = if (isInitialized()) value.toString() else "Lazy kPref $key not initialized yet."
+
+    operator fun setValue(any: Any, property: kotlin.reflect.KProperty<*>, t: T) {
+        _value = t
+        val editor = pref.sp.edit()
+        when (t) {
+            is Boolean -> editor.putBoolean(key, t)
+            is Float -> editor.putFloat(key, t)
+            is Int -> editor.putInt(key, t)
+            is Long -> editor.putLong(key, t)
+            is StringSet -> editor.putStringSet(key, t)
+            is String -> editor.putString(key, t)
+            else -> throw KPrefException(t)
+        }
+        editor.apply()
+        postSetter.invoke(t)
+    }
+}
+
+class KPrefException(message: String) : IllegalAccessException(message) {
+    constructor(element: Any?) : this("Invalid type in pref cache: ${element?.javaClass?.simpleName ?: "null"}")
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefCheckbox.kt b/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefCheckbox.kt
new file mode 100644
index 0000000..22cc927
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefCheckbox.kt
@@ -0,0 +1,33 @@
+package ca.allanwang.kau.kpref.items
+
+import android.view.View
+import android.widget.CheckBox
+import ca.allanwang.kau.R
+import ca.allanwang.kau.kpref.KPrefMarker
+import ca.allanwang.kau.utils.tint
+
+/**
+ * Created by Allan Wang on 2017-06-07.
+ *
+ * Checkbox preference
+ * When clicked, will toggle the preference and the apply the result to the checkbox
+ */
+class KPrefCheckbox(builder: BaseContract<Boolean>) : KPrefItemBase<Boolean>(builder) {
+
+    override fun defaultOnClick(itemView: View, innerContent: View?): Boolean {
+        pref = !pref
+        (innerContent as CheckBox).isChecked = pref
+        return true
+    }
+
+    override fun onPostBindView(viewHolder: ViewHolder, textColor: Int?, accentColor: Int?) {
+        super.onPostBindView(viewHolder, textColor, accentColor)
+        val checkbox = viewHolder.bindInnerView<CheckBox>(R.layout.kau_preference_checkbox)
+        if (accentColor != null) checkbox.tint(accentColor)
+        checkbox.isChecked = pref
+        checkbox.jumpDrawablesToCurrentState() //Cancel the animation
+    }
+
+    override fun getType(): Int = R.id.kau_item_pref_checkbox
+
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefColorPicker.kt b/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefColorPicker.kt
new file mode 100644
index 0000000..c573939
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefColorPicker.kt
@@ -0,0 +1,73 @@
+package ca.allanwang.kau.kpref.items
+
+import android.view.View
+import ca.allanwang.kau.R
+import ca.allanwang.kau.dialogs.color.CircleView
+import ca.allanwang.kau.dialogs.color.ColorBuilder
+import ca.allanwang.kau.dialogs.color.ColorContract
+import ca.allanwang.kau.dialogs.color.colorPickerDialog
+import ca.allanwang.kau.kpref.CoreAttributeContract
+import ca.allanwang.kau.kpref.GlobalOptions
+import ca.allanwang.kau.kpref.KPrefMarker
+
+/**
+ * Created by Allan Wang on 2017-06-07.
+ *
+ * ColorPicker preference
+ * When a color is successfully selected in the dialog, it will be saved as an int
+ */
+class KPrefColorPicker(val builder: KPrefColorContract) : KPrefItemBase<Int>(builder) {
+
+    override fun onPostBindView(viewHolder: ViewHolder, textColor: Int?, accentColor: Int?) {
+        super.onPostBindView(viewHolder, textColor, accentColor)
+        builder.apply {
+            titleRes = core.titleRes
+            colorCallback = {
+                pref = it
+            }
+        }
+        if (builder.showPreview) {
+            val preview = viewHolder.bindInnerView<CircleView>(R.layout.kau_preference_color_preview)
+            preview.setBackgroundColor(pref)
+            preview.withBorder = true
+            builder.apply {
+                colorCallback = {
+                    pref = it
+                    if (builder.showPreview)
+                        preview.setBackgroundColor(it)
+                }
+            }
+        }
+    }
+
+
+    override fun defaultOnClick(itemView: View, innerContent: View?): Boolean {
+        builder.apply {
+            defaultColor = pref //update color
+        }
+        itemView.context.colorPickerDialog(builder).show()
+        return true
+    }
+
+    /**
+     * Extension of the base contract and [ColorContract] along with a showPreview option
+     */
+    interface KPrefColorContract : BaseContract<Int>, ColorContract {
+        var showPreview: Boolean
+    }
+
+    /**
+     * Default implementation of [KPrefColorContract]
+     */
+    class KPrefColorBuilder(globalOptions: GlobalOptions,
+                            override var titleRes: Int,
+                            getter: () -> Int,
+                            setter: (value: Int) -> Unit
+    ) : KPrefColorContract, BaseContract<Int> by BaseBuilder<Int>(globalOptions, titleRes, getter, setter),
+            ColorContract by ColorBuilder() {
+        override var showPreview: Boolean = true
+    }
+
+    override fun getType(): Int = R.id.kau_item_pref_color_picker
+
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefHeader.kt b/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefHeader.kt
new file mode 100644
index 0000000..fa8efff
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefHeader.kt
@@ -0,0 +1,25 @@
+package ca.allanwang.kau.kpref.items
+
+import android.view.View
+import ca.allanwang.kau.R
+import ca.allanwang.kau.kpref.KPrefMarker
+
+/**
+ * Created by Allan Wang on 2017-06-07.
+ *
+ * Header preference
+ * This view just holds a title and is not clickable. It is styled using the accent color
+ */
+class KPrefHeader(builder: CoreContract) : KPrefItemCore(builder) {
+
+    override fun getLayoutRes(): Int = R.layout.kau_preference_header
+
+    override fun onPostBindView(viewHolder: ViewHolder, textColor: Int?, accentColor: Int?) {
+        if (accentColor != null) viewHolder.title.setTextColor(accentColor)
+    }
+
+    override fun onClick(itemView: View, innerContent: View?): Boolean = true
+
+    override fun getType() = R.id.kau_item_pref_header
+
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefItemBase.kt b/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefItemBase.kt
new file mode 100644
index 0000000..bb0f0a3
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefItemBase.kt
@@ -0,0 +1,85 @@
+package ca.allanwang.kau.kpref.items
+
+import android.support.annotation.CallSuper
+import android.view.View
+import ca.allanwang.kau.R
+import ca.allanwang.kau.kpref.CoreAttributeContract
+import ca.allanwang.kau.kpref.GlobalOptions
+import ca.allanwang.kau.utils.resolveDrawable
+
+/**
+ * Created by Allan Wang on 2017-06-05.
+ *
+ * Base class for pref setters that include the Shared Preference hooks
+ */
+abstract class KPrefItemBase<T>(val base: BaseContract<T>) : KPrefItemCore(base) {
+
+    open var pref: T
+        get() = base.getter.invoke()
+        set(value) {
+            base.setter.invoke(value)
+        }
+
+    var enabled: Boolean = true
+
+    init {
+        if (base.onClick == null) base.onClick = {
+            itemView, innerContent, _ ->
+            defaultOnClick(itemView, innerContent)
+        }
+    }
+
+    abstract fun defaultOnClick(itemView: View, innerContent: View?): Boolean
+
+    @CallSuper
+    override fun onPostBindView(viewHolder: ViewHolder, textColor: Int?, accentColor: Int?) {
+        enabled = base.enabler.invoke()
+        with(viewHolder) {
+            if (!enabled) container?.background = null
+            container?.alpha = if (enabled) 1.0f else 0.3f
+        }
+    }
+
+    override final fun onClick(itemView: View, innerContent: View?): Boolean {
+        return if (enabled) base.onClick?.invoke(itemView, innerContent, this) ?: false
+        else base.onDisabledClick?.invoke(itemView, innerContent, this) ?: false
+    }
+
+    override fun unbindView(holder: ViewHolder) {
+        super.unbindView(holder)
+        with(holder) {
+            container?.isEnabled = true
+            container?.background = itemView.context.resolveDrawable(android.R.attr.selectableItemBackground)
+            container?.alpha = 1.0f
+        }
+    }
+
+    override final fun getLayoutRes(): Int = R.layout.kau_preference
+
+    /**
+     * Extension of the core contract
+     * Since everything that extends the base is an actual preference, there must be a getter and setter
+     * The rest are optional and will have their defaults
+     */
+    interface BaseContract<T> : CoreContract {
+        var enabler: () -> Boolean
+        var onClick: ((itemView: View, innerContent: View?, item: KPrefItemBase<T>) -> Boolean)?
+        var onDisabledClick: ((itemView: View, innerContent: View?, item: KPrefItemBase<T>) -> Boolean)?
+        val getter: () -> T
+        val setter: (value: T) -> Unit
+    }
+
+    /**
+     * Default implementation of [BaseContract]
+     */
+    class BaseBuilder<T>(globalOptions: GlobalOptions,
+                         titleRes: Int,
+                         override val getter: () -> T,
+                         override val setter: (value: T) -> Unit
+    ) : CoreContract by CoreBuilder(globalOptions, titleRes), BaseContract<T> {
+        override var enabler: () -> Boolean = { true }
+        override var onClick: ((itemView: View, innerContent: View?, item: KPrefItemBase<T>) -> Boolean)? = null
+        override var onDisabledClick: ((itemView: View, innerContent: View?, item: KPrefItemBase<T>) -> Boolean)? = null
+    }
+
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefItemCore.kt b/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefItemCore.kt
new file mode 100644
index 0000000..5f684ba
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefItemCore.kt
@@ -0,0 +1,126 @@
+package ca.allanwang.kau.kpref.items
+
+import android.support.annotation.CallSuper
+import android.support.annotation.IdRes
+import android.support.annotation.LayoutRes
+import android.support.annotation.StringRes
+import android.support.v7.widget.RecyclerView
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.ImageView
+import android.widget.LinearLayout
+import android.widget.TextView
+import ca.allanwang.kau.R
+import ca.allanwang.kau.adapters.ThemableIItem
+import ca.allanwang.kau.adapters.ThemableIItemDelegate
+import ca.allanwang.kau.kpref.GlobalOptions
+import ca.allanwang.kau.kpref.KPrefMarker
+import ca.allanwang.kau.utils.*
+import com.mikepenz.fastadapter.items.AbstractItem
+import com.mikepenz.iconics.typeface.IIcon
+
+/**
+ * Created by Allan Wang on 2017-06-05.
+ *
+ * Core class containing nothing but the view items
+ */
+
+abstract class KPrefItemCore(val core: CoreContract) : AbstractItem<KPrefItemCore, KPrefItemCore.ViewHolder>(),
+        ThemableIItem by ThemableIItemDelegate() {
+
+    override final fun getViewHolder(v: View) = ViewHolder(v)
+
+    @CallSuper
+    override fun bindView(viewHolder: ViewHolder, payloads: List<Any>) {
+        super.bindView(viewHolder, payloads)
+        with(viewHolder) {
+            val context = itemView.context
+            title.text = context.string(core.titleRes)
+            if (core.descRes > 0)
+                desc?.visible()?.setText(core.descRes)
+            else
+                desc?.gone()
+            if (core.iicon != null) icon?.visible()?.setIcon(core.iicon, 24)
+            else icon?.gone()
+            innerFrame?.removeAllViews()
+            val textColor = core.globalOptions.textColor?.invoke()
+            if (textColor != null) {
+                title.setTextColor(textColor)
+                desc?.setTextColor(textColor)
+            }
+            val accentColor = core.globalOptions.accentColor?.invoke()
+            if (accentColor != null) {
+                icon?.drawable?.setTint(accentColor)
+            }
+            onPostBindView(this, textColor, accentColor)
+        }
+    }
+
+    abstract fun onPostBindView(viewHolder: ViewHolder, textColor: Int?, accentColor: Int?)
+
+    abstract fun onClick(itemView: View, innerContent: View?): Boolean
+
+    override fun unbindView(holder: ViewHolder) {
+        super.unbindView(holder)
+        with(holder) {
+            title.text = null
+            desc?.text = null
+            icon?.setImageDrawable(null)
+//            innerFrame?.removeAllViews()
+        }
+    }
+
+    /**
+     * Core values for all kpref items
+     */
+    @KPrefMarker
+    interface CoreContract {
+        val globalOptions: GlobalOptions
+        @get:StringRes val titleRes: Int
+        var descRes: Int
+            @StringRes get
+        var iicon: IIcon?
+
+        /**
+         * Attempts to reload current item by identifying it with its [titleRes]
+         */
+        fun reloadSelf()
+    }
+
+    /**
+     * Default implementation of [CoreContract]
+     */
+    class CoreBuilder(override val globalOptions: GlobalOptions,
+                      override @param:StringRes val titleRes: Int) : CoreContract {
+        override var descRes: Int = -1
+        override var iicon: IIcon? = null
+
+        override fun reloadSelf() {
+            globalOptions.reloadByTitle(titleRes)
+        }
+    }
+
+    class ViewHolder(v: View) : RecyclerView.ViewHolder(v) {
+        val title: TextView by bindView(R.id.kau_pref_title)
+        val container: ViewGroup? by bindOptionalView(R.id.kau_pref_container)
+        val desc: TextView? by bindOptionalView(R.id.kau_pref_desc)
+        val icon: ImageView? by bindOptionalView(R.id.kau_pref_icon)
+        val innerFrame: LinearLayout? by bindOptionalView(R.id.kau_pref_inner_frame)
+        val innerContent: View?
+            get() = itemView.findViewById(R.id.kau_pref_inner_content)
+
+        inline fun <reified T : View> bindInnerView(@LayoutRes id: Int): T {
+            if (innerFrame == null) throw IllegalStateException("Cannot bind inner view when innerFrame does not exist")
+            if (innerContent !is T) {
+                innerFrame!!.removeAllViews()
+                LayoutInflater.from(innerFrame!!.context).inflate(id, innerFrame)
+            }
+            return innerContent as T
+        }
+
+        inline fun <reified T : View> getInnerView() = innerContent as T
+
+        operator fun get(@IdRes id: Int): View = itemView.findViewById(id)
+    }
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefPlainText.kt b/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefPlainText.kt
new file mode 100644
index 0000000..a782430
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefPlainText.kt
@@ -0,0 +1,29 @@
+package ca.allanwang.kau.kpref.items
+
+import android.view.View
+import ca.allanwang.kau.R
+import ca.allanwang.kau.kpref.GlobalOptions
+
+/**
+ * Created by Allan Wang on 2017-06-14.
+ *
+ * Just text with the core options. Extends base preference but has an empty getter and setter
+ * Useful replacement of [KPrefText] when nothing is displayed on the right side,
+ * and when the preference is completely handled by the click
+ *
+ */
+class KPrefPlainText(val builder: KPrefPlainTextBuilder) : KPrefItemBase<Unit>(builder) {
+
+    override fun defaultOnClick(itemView: View, innerContent: View?): Boolean {
+        //nothing
+        return true
+    }
+
+    class KPrefPlainTextBuilder(
+            globalOptions: GlobalOptions,
+            titleRes: Int
+    ) : BaseContract<Unit> by BaseBuilder(globalOptions, titleRes, {}, {})
+
+    override fun getType(): Int = R.id.kau_item_pref_plain_text
+
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefSubItems.kt b/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefSubItems.kt
new file mode 100644
index 0000000..51625ab
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefSubItems.kt
@@ -0,0 +1,43 @@
+package ca.allanwang.kau.kpref.items
+
+import android.view.View
+import ca.allanwang.kau.R
+import ca.allanwang.kau.kpref.GlobalOptions
+import ca.allanwang.kau.kpref.KPrefAdapterBuilder
+
+/**
+ * Created by Allan Wang on 2017-06-14.
+ *
+ * Sub item preference
+ * When clicked, will navigate to a new set of preferences and add the old list to a stack
+ *
+ */
+class KPrefSubItems(val builder: KPrefSubItemsContract) : KPrefItemCore(builder) {
+
+    override fun onClick(itemView: View, innerContent: View?): Boolean {
+        builder.globalOptions.showNextPrefs(builder.titleRes, builder.itemBuilder)
+        return true
+    }
+
+    override fun getLayoutRes(): Int = R.layout.kau_preference
+
+    override fun onPostBindView(viewHolder: ViewHolder, textColor: Int?, accentColor: Int?) {}
+    /**
+     * Extension of the base contract with an optional text getter
+     */
+    interface KPrefSubItemsContract : CoreContract {
+        val itemBuilder: KPrefAdapterBuilder.() -> Unit
+    }
+
+    /**
+     * Default implementation of [KPrefTextContract]
+     */
+    class KPrefSubItemsBuilder(
+            globalOptions: GlobalOptions,
+            titleRes: Int,
+            override val itemBuilder: KPrefAdapterBuilder.() -> Unit
+    ) : KPrefSubItemsContract, CoreContract by CoreBuilder(globalOptions, titleRes)
+
+    override fun getType(): Int = R.id.kau_item_pref_sub_item
+
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefText.kt b/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefText.kt
new file mode 100644
index 0000000..8662b6a
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/kpref/items/KPrefText.kt
@@ -0,0 +1,62 @@
+package ca.allanwang.kau.kpref.items
+
+import android.view.View
+import android.widget.TextView
+import ca.allanwang.kau.R
+import ca.allanwang.kau.kpref.GlobalOptions
+import ca.allanwang.kau.utils.toast
+
+/**
+ * Created by Allan Wang on 2017-06-14.
+ *
+ * Text preference
+ * Holds a textview to display data on the right
+ * This is still a generic preference
+ *
+ */
+class KPrefText<T>(val builder: KPrefTextContract<T>) : KPrefItemBase<T>(builder) {
+
+    /**
+     * Automatically reload on set
+     */
+    override var pref: T
+        get() = base.getter.invoke()
+        set(value) {
+            base.setter.invoke(value)
+            builder.reloadSelf()
+        }
+
+    override fun defaultOnClick(itemView: View, innerContent: View?): Boolean {
+        itemView.context.toast("No click function set")
+        return true
+    }
+
+    override fun onPostBindView(viewHolder: ViewHolder, textColor: Int?, accentColor: Int?) {
+        super.onPostBindView(viewHolder, textColor, accentColor)
+        val textview = viewHolder.bindInnerView<TextView>(R.layout.kau_preference_text)
+        if (textColor != null) textview.setTextColor(textColor)
+        textview.text = builder.textGetter.invoke(pref)
+    }
+
+    /**
+     * Extension of the base contract with an optional text getter
+     */
+    interface KPrefTextContract<T> : BaseContract<T> {
+        var textGetter: (T) -> String?
+    }
+
+    /**
+     * Default implementation of [KPrefTextContract]
+     */
+    class KPrefTextBuilder<T>(
+            globalOptions: GlobalOptions,
+            titleRes: Int,
+            getter: () -> T,
+            setter: (value: T) -> Unit
+    ) : KPrefTextContract<T>, BaseContract<T> by BaseBuilder<T>(globalOptions, titleRes, getter, setter) {
+        override var textGetter: (T) -> String? = { it?.toString() }
+    }
+
+    override fun getType(): Int = R.id.kau_item_pref_text
+
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/logging/KL.kt b/core/src/main/kotlin/ca/allanwang/kau/logging/KL.kt
new file mode 100644
index 0000000..4fa3360
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/logging/KL.kt
@@ -0,0 +1,6 @@
+package ca.allanwang.kau.logging
+
+/**
+ * Created by Allan Wang on 2017-06-19.
+ */
+object KL : TimberLogger("KAU")
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/logging/TimberLogger.kt b/core/src/main/kotlin/ca/allanwang/kau/logging/TimberLogger.kt
new file mode 100644
index 0000000..5969fd5
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/logging/TimberLogger.kt
@@ -0,0 +1,19 @@
+package ca.allanwang.kau.logging
+
+import timber.log.Timber
+
+
+/**
+ * Created by Allan Wang on 2017-05-28.
+ *
+ * Timber extension that will embed the tag as part of the message for each log item
+ */
+open class TimberLogger(tag: String) {
+    internal val TAG = "$tag: %s"
+    fun e(s: String) = Timber.e(TAG, s)
+    fun e(t: Throwable, s: String = "error") = Timber.e(t, TAG, s)
+    fun d(s: String) = Timber.d(TAG, s)
+    fun i(s: String) = Timber.i(TAG, s)
+    fun v(s: String) = Timber.v(TAG, s)
+    fun eThrow(s: String) = e(Throwable(s))
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/permissions/PermissionManager.kt b/core/src/main/kotlin/ca/allanwang/kau/permissions/PermissionManager.kt
new file mode 100644
index 0000000..6f93c9f
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/permissions/PermissionManager.kt
@@ -0,0 +1,58 @@
+package ca.allanwang.kau.permissions
+
+import android.app.Activity
+import android.content.Context
+import android.support.v4.app.ActivityCompat
+import ca.allanwang.kau.logging.KL
+import ca.allanwang.kau.utils.KauException
+import ca.allanwang.kau.utils.buildIsMarshmallowAndUp
+import ca.allanwang.kau.utils.hasPermission
+import java.lang.ref.WeakReference
+
+/**
+ * Created by Allan Wang on 2017-07-03.
+ */
+internal object PermissionManager {
+
+    var requestInProgress = false
+    val pendingResults: MutableList<WeakReference<PermissionResult>> by lazy { mutableListOf<WeakReference<PermissionResult>>() }
+
+    operator fun invoke(context: Context, permissions: Array<out String>, callback: (granted: Boolean, deniedPerm: String?) -> Unit) {
+        KL.d("Requesting permissions: ${permissions.contentToString()}")
+        if (!buildIsMarshmallowAndUp) return callback(true, null)
+        val missingPermissions = permissions.filter { !context.hasPermission(it) }
+        if (missingPermissions.isEmpty()) return callback(true, null)
+        pendingResults.add(WeakReference(PermissionResult(permissions, callback = callback)))
+        if (!requestInProgress) {
+            requestInProgress = true
+            requestPermissions(context, missingPermissions.toTypedArray())
+        } else KL.d("Request is postponed since another one is still in progress; did you remember to override onRequestPermissionsResult?")
+    }
+
+    @Synchronized internal fun requestPermissions(context: Context, permissions: Array<out String>) {
+        val activity = (context as? Activity) ?: throw KauException("Context is not an instance of an activity; cannot request permissions")
+        ActivityCompat.requestPermissions(activity, permissions, 1)
+    }
+
+    fun onRequestPermissionsResult(context: Context, permissions: Array<out String>, grantResults: IntArray) {
+        val count = Math.min(permissions.size, grantResults.size)
+        val iter = pendingResults.iterator()
+        while (iter.hasNext()) {
+            val action = iter.next().get()
+            if ((0 until count).any { action?.onResult(permissions[it], grantResults[it]) ?: true })
+                iter.remove()
+        }
+        if (pendingResults.isEmpty())
+            requestInProgress = false
+        else {
+            val action = pendingResults.map { it.get() }.firstOrNull { it != null }
+            if (action == null) { //actions have been unlinked from their weak references
+                pendingResults.clear()
+                requestInProgress = false
+                return
+            }
+            requestPermissions(context, action.permissions.toTypedArray())
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/permissions/PermissionResult.kt b/core/src/main/kotlin/ca/allanwang/kau/permissions/PermissionResult.kt
new file mode 100644
index 0000000..14bfdff
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/permissions/PermissionResult.kt
@@ -0,0 +1,26 @@
+package ca.allanwang.kau.permissions
+
+import android.content.pm.PackageManager
+
+/**
+ * Created by Allan Wang on 2017-07-03.
+ */
+class PermissionResult(permissions: Array<out String>, val callback: (granted: Boolean, deniedPerm: String?) -> Unit) {
+    val permissions = mutableSetOf(*permissions)
+
+    /**
+     * Called from the manager whenever a permission has changed
+     * Returns true if result is completed, false otherwise
+     */
+    fun onResult(permission: String, result: Int): Boolean {
+        if (result != PackageManager.PERMISSION_GRANTED) {
+            callback(false, permission)
+            permissions.clear()
+            return true
+        }
+        permissions.remove(permission)
+        if (permissions.isNotEmpty()) return false
+        callback(true, null)
+        return true
+    }
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/permissions/Permissions.kt b/core/src/main/kotlin/ca/allanwang/kau/permissions/Permissions.kt
new file mode 100644
index 0000000..fd43102
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/permissions/Permissions.kt
@@ -0,0 +1,68 @@
+package ca.allanwang.kau.permissions
+
+import android.Manifest
+import android.app.Activity
+import android.content.Context
+
+
+/**
+ * Created by Allan Wang on 2017-07-02.
+ *
+ * Bindings for the permission manager
+ */
+
+/**
+ * Hook that should be added inside all [Activity.onRequestPermissionsResult] so that the Permission manager can handle the responses
+ */
+fun Activity.kauOnRequestPermissionsResult(permissions: Array<out String>, grantResults: IntArray)
+        = PermissionManager.onRequestPermissionsResult(this, permissions, grantResults)
+
+/**
+ * Request a permission with a callback
+ * In reality, an activity is needed to fulfill the request, but a context is enough if those permissions are already granted
+ * To be safe, you may want to check that the context can be casted successfully first
+ * The [callback] returns [granted], which is true if all permissions are granted
+ * [deniedPerm] is the first denied permission, if granted is false
+ */
+fun Context.kauRequestPermissions(vararg permissions: String, callback: (granted: Boolean, deniedPerm: String?) -> Unit)
+        = PermissionManager(this, permissions, callback)
+
+/**
+ * See http://developer.android.com/guide/topics/security/permissions.html#normal-dangerous for a
+ * list of 'dangerous' permissions that require a permission request on API 23.
+ */
+const val PERMISSION_READ_CALENDAR = Manifest.permission.READ_CALENDAR
+
+const val PERMISSION_WRITE_CALENDAR = Manifest.permission.WRITE_CALENDAR
+
+const val PERMISSION_CAMERA = Manifest.permission.CAMERA
+
+const val PERMISSION_READ_CONTACTS = Manifest.permission.READ_CONTACTS
+const val PERMISSION_WRITE_CONTACTS = Manifest.permission.WRITE_CONTACTS
+const val PERMISSION_GET_ACCOUNTS = Manifest.permission.GET_ACCOUNTS
+
+const val PERMISSION_ACCESS_FINE_LOCATION = Manifest.permission.ACCESS_FINE_LOCATION
+const val PERMISSION_ACCESS_COARSE_LOCATION = Manifest.permission.ACCESS_COARSE_LOCATION
+
+const val PERMISSION_RECORD_AUDIO = Manifest.permission.RECORD_AUDIO
+
+const val PERMISSION_READ_PHONE_STATE = Manifest.permission.READ_PHONE_STATE
+const val PERMISSION_CALL_PHONE = Manifest.permission.CALL_PHONE
+const val PERMISSION_READ_CALL_LOG = Manifest.permission.READ_CALL_LOG
+const val PERMISSION_WRITE_CALL_LOG = Manifest.permission.WRITE_CALL_LOG
+const val PERMISSION_ADD_VOICEMAIL = Manifest.permission.ADD_VOICEMAIL
+const val PERMISSION_USE_SIP = Manifest.permission.USE_SIP
+const val PERMISSION_PROCESS_OUTGOING_CALLS = Manifest.permission.PROCESS_OUTGOING_CALLS
+
+const val PERMISSION_BODY_SENSORS = Manifest.permission.BODY_SENSORS
+
+const val PERMISSION_SEND_SMS = Manifest.permission.SEND_SMS
+const val PERMISSION_RECEIVE_SMS = Manifest.permission.RECEIVE_SMS
+const val PERMISSION_READ_SMS = Manifest.permission.READ_SMS
+const val PERMISSION_RECEIVE_WAP_PUSH = Manifest.permission.RECEIVE_WAP_PUSH
+const val PERMISSION_RECEIVE_MMS = Manifest.permission.RECEIVE_MMS
+
+const val PERMISSION_READ_EXTERNAL_STORAGE = Manifest.permission.READ_EXTERNAL_STORAGE
+const val PERMISSION_WRITE_EXTERNAL_STORAGE = Manifest.permission.WRITE_EXTERNAL_STORAGE
+
+const val PERMISSION_SYSTEM_ALERT_WINDOW = Manifest.permission.SYSTEM_ALERT_WINDOW
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/searchview/SearchItem.kt b/core/src/main/kotlin/ca/allanwang/kau/searchview/SearchItem.kt
new file mode 100644
index 0000000..ac8ec2e
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/searchview/SearchItem.kt
@@ -0,0 +1,80 @@
+package ca.allanwang.kau.searchview
+
+import android.graphics.Typeface
+import android.graphics.drawable.Drawable
+import android.support.constraint.ConstraintLayout
+import android.support.v7.widget.RecyclerView
+import android.text.Spannable
+import android.text.SpannableStringBuilder
+import android.text.style.StyleSpan
+import android.view.View
+import android.widget.ImageView
+import android.widget.TextView
+import ca.allanwang.kau.R
+import ca.allanwang.kau.iitems.KauIItem
+import ca.allanwang.kau.utils.*
+import com.mikepenz.google_material_typeface_library.GoogleMaterial
+import com.mikepenz.iconics.typeface.IIcon
+
+/**
+ * Created by Allan Wang on 2017-06-23.
+ *
+ * A holder for each individual search item
+ * Contains a [key] which acts as a unique identifier (eg url)
+ * and a [content] which is displayed in the item
+ */
+class SearchItem(val key: String,
+                 val content: String = key,
+                 val description: String? = null,
+                 val iicon: IIcon? = GoogleMaterial.Icon.gmd_search,
+                 val image: Drawable? = null
+) : KauIItem<SearchItem, SearchItem.ViewHolder>(
+        R.id.kau_item_search,
+        R.layout.kau_search_iitem,
+        {ViewHolder(it)}
+) {
+
+    companion object {
+        @JvmStatic var foregroundColor: Int = 0xdd000000.toInt()
+        @JvmStatic var backgroundColor: Int = 0xfffafafa.toInt()
+    }
+
+    var styledContent: SpannableStringBuilder? = null
+
+    /**
+     * Highlight the subText if it is present in the content
+     */
+    fun withHighlights(subText: String) {
+        val index = content.indexOf(subText)
+        if (index == -1) return
+        styledContent = SpannableStringBuilder(content)
+        styledContent!!.setSpan(StyleSpan(Typeface.BOLD), index, index + subText.length, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
+    }
+
+    override fun bindView(holder: ViewHolder, payloads: MutableList<Any>?) {
+        super.bindView(holder, payloads)
+        holder.title.setTextColor(foregroundColor)
+        holder.desc.setTextColor(foregroundColor.adjustAlpha(0.6f))
+
+        if (image != null) holder.icon.setImageDrawable(image)
+        else holder.icon.setIcon(iicon, sizeDp = 18, color = foregroundColor)
+
+        holder.container.setRippleBackground(foregroundColor, backgroundColor)
+        holder.title.text = styledContent ?: content
+        if (description?.isNotBlank() ?: false) holder.desc.visible().text = description
+    }
+
+    override fun unbindView(holder: ViewHolder) {
+        super.unbindView(holder)
+        holder.title.text = null
+        holder.desc.gone().text = null
+        holder.icon.setImageDrawable(null)
+    }
+
+    class ViewHolder(v: View) : RecyclerView.ViewHolder(v) {
+        val icon: ImageView by bindView(R.id.search_icon)
+        val title: TextView by bindView(R.id.search_title)
+        val desc: TextView by bindView(R.id.search_desc)
+        val container: ConstraintLayout by bindView(R.id.search_item_frame)
+    }
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/searchview/SearchView.kt b/core/src/main/kotlin/ca/allanwang/kau/searchview/SearchView.kt
new file mode 100644
index 0000000..c077a06
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/searchview/SearchView.kt
@@ -0,0 +1,412 @@
+package ca.allanwang.kau.searchview
+
+import android.app.Activity
+import android.content.Context
+import android.content.res.ColorStateList
+import android.graphics.Color
+import android.support.annotation.ColorInt
+import android.support.annotation.IdRes
+import android.support.annotation.StringRes
+import android.support.transition.AutoTransition
+import android.support.v7.widget.AppCompatEditText
+import android.support.v7.widget.LinearLayoutManager
+import android.support.v7.widget.RecyclerView
+import android.util.AttributeSet
+import android.view.*
+import android.widget.FrameLayout
+import android.widget.ImageView
+import android.widget.ProgressBar
+import ca.allanwang.kau.R
+import ca.allanwang.kau.animators.NoAnimator
+import ca.allanwang.kau.kotlin.nonReadable
+import ca.allanwang.kau.searchview.SearchView.Configs
+import ca.allanwang.kau.utils.*
+import ca.allanwang.kau.views.BoundedCardView
+import com.jakewharton.rxbinding2.widget.RxTextView
+import com.mikepenz.fastadapter.commons.adapters.FastItemAdapter
+import com.mikepenz.google_material_typeface_library.GoogleMaterial
+import com.mikepenz.iconics.typeface.IIcon
+import io.reactivex.Observable
+import io.reactivex.schedulers.Schedulers
+import org.jetbrains.anko.runOnUiThread
+
+
+/**
+ * Created by Allan Wang on 2017-06-23.
+ *
+ * A materialized SearchView with complete theming and observables
+ * This view can be added programmatically and configured using the [Configs] DSL
+ * It is preferred to add the view through an activity, but it can be attached to any ViewGroup
+ * Beware of where specifically this is added, as its view or the keyboard may affect positioning
+ *
+ * Huge thanks to @lapism for his base
+ * https://github.com/lapism/SearchView
+ */
+class SearchView @JvmOverloads constructor(
+        context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
+) : FrameLayout(context, attrs, defStyleAttr) {
+
+    /**
+     * Collection of all possible arguments when building the SearchView
+     * Everything is made as opened as possible so other components may be found in the [SearchView]
+     * However, these are the notable options put together an an inner class for better visibility
+     */
+    inner class Configs {
+        /**
+         * In the searchview, foreground color accounts for all text colors and icon colors
+         * Various alpha levels may be used for sub texts/dividers etc
+         */
+        var foregroundColor: Int
+            get() = SearchItem.foregroundColor
+            set(value) {
+                if (SearchItem.foregroundColor == value) return
+                SearchItem.foregroundColor = value
+                tintForeground(value)
+            }
+        /**
+         * Namely the background for the card and recycler view
+         */
+        var backgroundColor: Int
+            get() = SearchItem.backgroundColor
+            set(value) {
+                if (SearchItem.backgroundColor == value) return
+                SearchItem.backgroundColor = value
+                tintBackground(value)
+            }
+        /**
+         * Icon for the leftmost ImageView, which typically contains the hamburger menu/back arror
+         */
+        var navIcon: IIcon? = GoogleMaterial.Icon.gmd_arrow_back
+            set(value) {
+                field = value
+                iconNav.setSearchIcon(value)
+                if (value == null) iconNav.gone()
+            }
+
+        /**
+         * Optional icon just to the left of the clear icon
+         * This is not implemented by default, but can be used for anything, such as mic or redirects
+         * Returns the extra imageview
+         * Set the iicon as null to hide the extra icon
+         */
+        fun setExtraIcon(iicon: IIcon?, onClick: OnClickListener?): ImageView {
+            iconExtra.setSearchIcon(iicon)
+            if (iicon == null) iconClear.gone()
+            iconExtra.setOnClickListener(onClick)
+            return iconExtra
+        }
+
+        /**
+         * Icon for the rightmost ImageView, which typically contains a close icon
+         */
+        var clearIcon: IIcon? = GoogleMaterial.Icon.gmd_clear
+            set(value) {
+                field = value
+                iconClear.setSearchIcon(value)
+                if (value == null) iconClear.gone()
+            }
+        /**
+         * Duration for the circular reveal animation
+         */
+        var revealDuration: Long = 300L
+        /**
+         * Duration for the auto transition, which is namely used to resize the recycler view
+         */
+        var transitionDuration: Long = 100L
+        /**
+         * Defines whether the edit text and mainAdapter should clear themselves when the searchView is closed
+         */
+        var shouldClearOnClose: Boolean = false
+        /**
+         * Callback that will be called every time the searchView opens
+         */
+        var openListener: ((searchView: SearchView) -> Unit)? = null
+        /**
+         * Callback that will be called every time the searchView closes
+         */
+        var closeListener: ((searchView: SearchView) -> Unit)? = null
+        /**
+         * Draw a divider between the search bar and the suggestion items
+         * The divider is colored based on the [foregroundColor]
+         */
+        var withDivider: Boolean = true
+            set(value) {
+                field = value
+                if (value) divider.visible() else divider.invisible()
+            }
+        /**
+         * Hint string to be set in the searchView
+         */
+        var hintText: String?
+            get() = editText.hint?.toString()
+            set(value) {
+                editText.hint = value
+            }
+        /**
+         * Hint string res to be set in the searchView
+         */
+        var hintTextRes: Int
+            @Deprecated(level = DeprecationLevel.ERROR, message = "Non readable property")
+            get() = nonReadable()
+            @StringRes set(value) {
+                hintText = context.string(value)
+            }
+        /**
+         * StringRes for a "no results found" item
+         * If [results] is ever set to an empty list, it will default to
+         * a list with one item with this string
+         *
+         * For simplicity, kau contains [R.string.kau_no_results_found]
+         * which you may use
+         */
+        var noResultsFound: Int = -1
+        /**
+         * Text watcher configurations on init
+         * By default, the observable is on a separate thread, so you may directly execute background processes
+         * This builder acts on an observable, so you may switch threads, debounce, and do anything else that you require
+         */
+        var textObserver: (observable: Observable<String>, searchView: SearchView) -> Unit = { _, _ -> }
+        /**
+         * Click event for suggestion items
+         * This event is only triggered when [key] is not blank (like in [noResultsFound]
+         */
+        var onItemClick: (position: Int, key: String, content: String, searchView: SearchView) -> Unit = { _, _, _, _ -> }
+        /**
+         * Long click event for suggestion items
+         * This event is only triggered when [key] is not blank (like in [noResultsFound]
+         */
+        var onItemLongClick: (position: Int, key: String, content: String, searchView: SearchView) -> Unit = { _, _, _, _ -> }
+        /**
+         * If a [SearchItem]'s title contains the submitted query, make that portion bold
+         * See [SearchItem.withHighlights]
+         */
+        var highlightQueryText: Boolean = true
+    }
+
+    /**
+     * Contract for mainAdapter items
+     * Setting results will ensure that the values are sent on the UI thread
+     */
+    var results: List<SearchItem>
+        get() = adapter.adapterItems
+        set(value) = context.runOnUiThread {
+            val list = if (value.isEmpty() && configs.noResultsFound > 0)
+                listOf(SearchItem("", context.string(configs.noResultsFound), iicon = null))
+            else value
+            if (configs.highlightQueryText && value.isNotEmpty()) list.forEach { it.withHighlights(editText.text.toString()) }
+            cardTransition()
+            adapter.setNewList(list)
+        }
+
+    /**
+     * Empties the list on the UI thread
+     * The noResults item will not be added
+     */
+    internal fun clearResults() = context.runOnUiThread { cardTransition(); adapter.clear() }
+
+    val configs = Configs()
+    //views
+    private val shadow: View by bindView(R.id.search_shadow)
+    private val card: BoundedCardView by bindView(R.id.search_cardview)
+    private val iconNav: ImageView by bindView(R.id.search_nav)
+    private val editText: AppCompatEditText by bindView(R.id.search_edit_text)
+    val textEvents: Observable<String>
+    private val progress: ProgressBar by bindView(R.id.search_progress)
+    val iconExtra: ImageView by bindView(R.id.search_extra)
+    private val iconClear: ImageView by bindView(R.id.search_clear)
+    private val divider: View by bindView(R.id.search_divider)
+    private val recycler: RecyclerView by bindView(R.id.search_recycler)
+    val adapter = FastItemAdapter<SearchItem>()
+    var menuItem: MenuItem? = null
+    val isOpen: Boolean
+        get() = card.isVisible()
+
+    /*
+     * Ripple start points and search view offset
+     * These are calculated every time the search view is opened,
+     * and can be overridden with the open listener if necessary
+     */
+    var menuX: Int = -1             //starting x for circular reveal
+    var menuY: Int = -1             //reference for cardview's marginTop
+    var menuHalfHeight: Int = -1    //starting y for circular reveal (relative to the cardview)
+
+    init {
+        View.inflate(context, R.layout.kau_search_view, this)
+        z = 99f
+        iconNav.setSearchIcon(configs.navIcon).setOnClickListener { revealClose() }
+        iconClear.setSearchIcon(configs.clearIcon).setOnClickListener { editText.text.clear() }
+        tintForeground(configs.foregroundColor)
+        tintBackground(configs.backgroundColor)
+        with(recycler) {
+            isNestedScrollingEnabled = false
+            layoutManager = LinearLayoutManager(context)
+            addOnScrollListener(object : RecyclerView.OnScrollListener() {
+                override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
+                    super.onScrollStateChanged(recyclerView, newState)
+                    if (newState == RecyclerView.SCROLL_STATE_DRAGGING) hideKeyboard()
+                }
+            })
+            adapter = this@SearchView.adapter
+            itemAnimator = NoAnimator()
+        }
+        with(adapter) {
+            withSelectable(true)
+            withOnClickListener { _, _, item, position ->
+                if (item.key.isNotBlank()) configs.onItemClick(position, item.key, item.content, this@SearchView); true
+            }
+            withOnLongClickListener { _, _, item, position ->
+                if (item.key.isNotBlank()) configs.onItemLongClick(position, item.key, item.content, this@SearchView); true
+            }
+        }
+        textEvents = RxTextView.textChangeEvents(editText)
+                .skipInitialValue()
+                .observeOn(Schedulers.newThread())
+                .map { it.text().toString().trim() }
+        textEvents.filter { it.isBlank() }
+                .subscribe { clearResults() }
+    }
+
+    internal fun ImageView.setSearchIcon(iicon: IIcon?): ImageView {
+        setIcon(iicon, sizeDp = 18, color = configs.foregroundColor)
+        return this
+    }
+
+    internal fun cardTransition(builder: AutoTransition.() -> Unit = {}) {
+        card.transitionAuto { duration = configs.transitionDuration; builder() }
+    }
+
+    fun config(config: Configs.() -> Unit) {
+        configs.config()
+    }
+
+    /**
+     * Binds the SearchView to a menu item and handles everything internally
+     * This is assuming that SearchView has already been added to a ViewGroup
+     * If not, see the extension function [bindSearchView]
+     */
+    fun bind(menu: Menu, @IdRes id: Int, @ColorInt menuIconColor: Int = Color.WHITE, config: Configs.() -> Unit = {}): SearchView {
+        config(config)
+        configs.textObserver(textEvents.filter { it.isNotBlank() }, this)
+        menuItem = menu.findItem(id)
+        if (menuItem!!.icon == null) menuItem!!.icon = GoogleMaterial.Icon.gmd_search.toDrawable(context, 18, menuIconColor)
+        card.gone()
+        menuItem!!.setOnMenuItemClickListener { configureCoords(it); revealOpen(); true }
+        shadow.setOnClickListener { revealClose() }
+        return this
+    }
+
+    fun unBind(replacementMenuItemClickListener: MenuItem.OnMenuItemClickListener? = null) {
+        parentViewGroup.removeView(this)
+        menuItem?.setOnMenuItemClickListener(replacementMenuItemClickListener)
+    }
+
+    fun configureCoords(item: MenuItem) {
+        val view = parentViewGroup.findViewById<View>(item.itemId) ?: return
+        val locations = IntArray(2)
+        view.getLocationOnScreen(locations)
+        menuX = (locations[0] + view.width / 2)
+        menuHalfHeight = view.height / 2
+        menuY = (locations[1] + menuHalfHeight)
+        card.viewTreeObserver.addOnPreDrawListener(object : ViewTreeObserver.OnPreDrawListener {
+            override fun onPreDraw(): Boolean {
+                view.viewTreeObserver.removeOnPreDrawListener(this)
+                val topAlignment = menuY - card.height / 2
+                val params = (card.layoutParams as MarginLayoutParams).apply {
+                    topMargin = topAlignment
+                }
+                card.layoutParams = params
+                return false
+            }
+        })
+    }
+
+    /**
+     * Handle a back press event
+     * Returns true if back press is consumed, false otherwise
+     */
+    fun onBackPressed(): Boolean {
+        if (isOpen && menuItem != null) {
+            revealClose()
+            return true
+        }
+        return false
+    }
+
+    /**
+     * Tint foreground attributes
+     * This can be done publicly through [configs], which will also save the color
+     */
+    internal fun tintForeground(@ColorInt color: Int) {
+        iconNav.drawable.setTint(color)
+        iconClear.drawable.setTint(color)
+        divider.setBackgroundColor(color.adjustAlpha(0.1f))
+        editText.tint(color)
+        editText.setTextColor(ColorStateList.valueOf(color))
+    }
+
+    /**
+     * Tint background attributes
+     * This can be done publicly through [configs], which will also save the color
+     */
+    internal fun tintBackground(@ColorInt color: Int) {
+        card.setCardBackgroundColor(color)
+    }
+
+    fun revealOpen() {
+        if (isOpen) return
+        /**
+         * The y component is relative to the cardView, but it hasn't been drawn yet so its own height is 0
+         * We therefore use half the menuItem height, which is a close approximation to our intended value
+         * The cardView matches the parent's width, so menuX is correct
+         */
+        configs.openListener?.invoke(this)
+        shadow.fadeIn()
+        editText.showKeyboard()
+        card.circularReveal(menuX, menuHalfHeight, duration = configs.revealDuration) {
+            cardTransition()
+            recycler.visible()
+        }
+    }
+
+    fun revealClose() {
+        if (!isOpen) return
+        shadow.fadeOut(duration = configs.transitionDuration)
+        cardTransition {
+            addEndListener {
+                card.circularHide(menuX, menuHalfHeight, duration = configs.revealDuration,
+                        onFinish = {
+                            configs.closeListener?.invoke(this@SearchView)
+                            if (configs.shouldClearOnClose) editText.text.clear()
+                            recycler.gone()
+                        })
+            }
+        }
+        recycler.gone()
+        editText.hideKeyboard()
+    }
+}
+
+@DslMarker
+annotation class KauSearch
+
+/**
+ * Helper function that binds to an activity's main view
+ */
+@KauSearch
+fun Activity.bindSearchView(menu: Menu, @IdRes id: Int, @ColorInt menuIconColor: Int = Color.WHITE, config: SearchView.Configs.() -> Unit = {}): SearchView
+        = findViewById<ViewGroup>(android.R.id.content).bindSearchView(menu, id, menuIconColor, config)
+
+/**
+ * Bind searchView to a menu item; call this in [Activity.onCreateOptionsMenu]
+ * Be wary that if you may reinflate the menu many times (eg through [Activity.invalidateOptionsMenu]),
+ * it may be worthwhile to hold a reference to the searchview and only bind it if it hasn't been bound before
+ */
+@KauSearch
+fun ViewGroup.bindSearchView(menu: Menu, @IdRes id: Int, @ColorInt menuIconColor: Int = Color.WHITE, config: SearchView.Configs.() -> Unit = {}): SearchView {
+    val searchView = SearchView(context)
+    searchView.layoutParams = FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT)
+    addView(searchView)
+    searchView.bind(menu, id, menuIconColor, config)
+    return searchView
+}
+
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/ActivityUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/ActivityUtils.kt
new file mode 100644
index 0000000..ec51bfd
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/ActivityUtils.kt
@@ -0,0 +1,71 @@
+package ca.allanwang.kau.utils
+
+import android.app.Activity
+import android.content.Intent
+import android.graphics.Color
+import android.support.annotation.ColorInt
+import android.support.annotation.StringRes
+import android.support.design.widget.Snackbar
+import android.support.v4.app.Fragment
+import android.view.Menu
+import ca.allanwang.kau.R
+import com.mikepenz.iconics.typeface.IIcon
+import org.jetbrains.anko.contentView
+import org.jetbrains.anko.withArguments
+
+/**
+ * Created by Allan Wang on 2017-06-21.
+ */
+
+/**
+ * Restarts an activity from itself without animations
+ * Keeps its existing extra bundles and has a builder to accept other parameters
+ */
+fun Activity.restart(builder: Intent.() -> Unit = {}) {
+    val i = Intent(this, this::class.java)
+    i.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION)
+    i.putExtras(intent.extras)
+    i.builder()
+    startActivity(i)
+    overridePendingTransition(0, 0) //No transitions
+    finish()
+    overridePendingTransition(0, 0)
+}
+
+fun Activity.finishSlideOut() {
+    finish()
+    overridePendingTransition(R.anim.kau_fade_in, R.anim.kau_slide_out_right_top)
+}
+
+var Activity.navigationBarColor: Int
+    get() = if (buildIsLollipopAndUp) window.navigationBarColor else Color.BLACK
+    set(value) {
+        if (buildIsLollipopAndUp) window.navigationBarColor = value
+    }
+
+var Activity.statusBarColor: Int
+    get() = if (buildIsLollipopAndUp) window.statusBarColor else Color.BLACK
+    set(value) {
+        if (buildIsLollipopAndUp) window.statusBarColor = value
+    }
+
+/**
+ * Themes the base menu icons and adds iicons programmatically based on ids
+ *
+ * Call in [Activity.onCreateOptionsMenu]
+ */
+fun Activity.setMenuIcons(menu: Menu, @ColorInt color: Int = Color.WHITE, vararg iicons: Pair<Int, IIcon>) {
+    iicons.forEach { (id, iicon) ->
+        menu.findItem(id).icon = iicon.toDrawable(this, sizeDp = 18, color = color)
+    }
+}
+
+fun Activity.hideKeyboard() = currentFocus.hideKeyboard()
+
+fun Activity.showKeyboard() = currentFocus.showKeyboard()
+
+fun Activity.snackbar(text: String, duration: Int = Snackbar.LENGTH_LONG, builder: Snackbar.() -> Unit = {})
+        = contentView!!.snackbar(text, duration, builder)
+
+fun Activity.snackbar(@StringRes textId: Int, duration: Int = Snackbar.LENGTH_LONG, builder: Snackbar.() -> Unit = {})
+        = contentView!!.snackbar(textId, duration, builder)
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/AnimHolder.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/AnimHolder.kt
new file mode 100644
index 0000000..3db8b9c
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/AnimHolder.kt
@@ -0,0 +1,15 @@
+package ca.allanwang.kau.utils
+
+import ca.allanwang.kau.kotlin.lazyInterpolator
+
+/**
+ * Created by Allan Wang on 2017-06-28.
+ *
+ * Holder for a bunch of common animators/interpolators used throughout this library
+ */
+object AnimHolder {
+
+    val fastOutSlowInInterpolator = lazyInterpolator(android.R.interpolator.fast_out_linear_in)
+    val decelerateInterpolator = lazyInterpolator(android.R.interpolator.decelerate_cubic)
+
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/AnimUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/AnimUtils.kt
new file mode 100644
index 0000000..86b049e
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/AnimUtils.kt
@@ -0,0 +1,153 @@
+package ca.allanwang.kau.utils
+
+import android.animation.Animator
+import android.animation.AnimatorListenerAdapter
+import android.content.Context
+import android.support.annotation.StringRes
+import android.view.View
+import android.view.ViewAnimationUtils
+import android.view.animation.Animation
+import android.view.animation.AnimationUtils
+import android.view.animation.DecelerateInterpolator
+import android.view.animation.Interpolator
+import android.widget.TextView
+import ca.allanwang.kau.kotlin.lazyContext
+
+/**
+ * Created by Allan Wang on 2017-06-01.
+ *
+ * Animation extension @KauUtils functions for Views
+ */
+@KauUtils fun View.rootCircularReveal(x: Int = 0, y: Int = 0, duration: Long = 500L, onStart: (() -> Unit)? = null, onFinish: (() -> Unit)? = null) {
+    this.addOnLayoutChangeListener(object : View.OnLayoutChangeListener {
+        override @KauUtils fun onLayoutChange(v: View, left: Int, top: Int, right: Int, bottom: Int, oldLeft: Int, oldTop: Int,
+                                              oldRight: Int, oldBottom: Int) {
+            v.removeOnLayoutChangeListener(this)
+            var x2 = x
+            var y2 = y
+            if (x2 > right) x2 = 0
+            if (y2 > bottom) y2 = 0
+            val radius = Math.hypot(Math.max(x2, right - x2).toDouble(), Math.max(y2, bottom - y2).toDouble()).toInt()
+            val reveal = ViewAnimationUtils.createCircularReveal(v, x2, y2, 0f, radius.toFloat())
+            reveal.interpolator = DecelerateInterpolator(1f)
+            reveal.duration = duration
+            reveal.addListener(object : AnimatorListenerAdapter() {
+                override @KauUtils fun onAnimationStart(animation: Animator?) {
+                    visible()
+                    onStart?.invoke()
+                }
+
+                override @KauUtils fun onAnimationEnd(animation: Animator?) = onFinish?.invoke() ?: Unit
+                override @KauUtils fun onAnimationCancel(animation: Animator?) = onFinish?.invoke() ?: Unit
+            })
+            reveal.start()
+        }
+    })
+}
+
+@KauUtils fun View.circularReveal(x: Int = 0, y: Int = 0, offset: Long = 0L, radius: Float = -1.0f, duration: Long = 500L, onStart: (() -> Unit)? = null, onFinish: (() -> Unit)? = null) {
+    if (!isAttachedToWindow) {
+        onStart?.invoke()
+        visible()
+        onFinish?.invoke()
+        return
+    }
+    var r = radius
+    if (r < 0.0f) {
+        r = Math.max(Math.hypot(x.toDouble(), y.toDouble()), Math.hypot((width - x.toDouble()), (height - y.toDouble()))).toFloat()
+    }
+    val anim = ViewAnimationUtils.createCircularReveal(this, x, y, 0f, r).setDuration(duration)
+    anim.startDelay = offset
+    anim.addListener(object : AnimatorListenerAdapter() {
+        override @KauUtils fun onAnimationStart(animation: Animator?) {
+            visible()
+            onStart?.invoke()
+        }
+
+        override @KauUtils fun onAnimationEnd(animation: Animator?) = onFinish?.invoke() ?: Unit
+        override @KauUtils fun onAnimationCancel(animation: Animator?) = onFinish?.invoke() ?: Unit
+    })
+    anim.start()
+}
+
+@KauUtils fun View.circularHide(x: Int = 0, y: Int = 0, offset: Long = 0L, radius: Float = -1.0f, duration: Long = 500L, onStart: (() -> Unit)? = null, onFinish: (() -> Unit)? = null) {
+    if (!isAttachedToWindow) {
+        onStart?.invoke()
+        invisible()
+        onFinish?.invoke()
+        return
+    }
+    var r = radius
+    if (r < 0.0f) {
+        r = Math.max(Math.hypot(x.toDouble(), y.toDouble()), Math.hypot((width - x.toDouble()), (height - y.toDouble()))).toFloat()
+    }
+    val anim = ViewAnimationUtils.createCircularReveal(this, x, y, r, 0f).setDuration(duration)
+    anim.startDelay = offset
+    anim.addListener(object : AnimatorListenerAdapter() {
+        override @KauUtils fun onAnimationStart(animation: Animator?) = onStart?.invoke() ?: Unit
+
+        override @KauUtils fun onAnimationEnd(animation: Animator?) {
+            invisible()
+            onFinish?.invoke() ?: Unit
+        }
+
+        override @KauUtils fun onAnimationCancel(animation: Animator?) = onFinish?.invoke() ?: Unit
+    })
+    anim.start()
+}
+
+@KauUtils fun View.fadeIn(offset: Long = 0L, duration: Long = 200L, onStart: (() -> Unit)? = null, onFinish: (() -> Unit)? = null) {
+    if (!isAttachedToWindow) {
+        onStart?.invoke()
+        visible()
+        onFinish?.invoke()
+        return
+    }
+    if (isAttachedToWindow) {
+        val anim = AnimationUtils.loadAnimation(context, android.R.anim.fade_in)
+        anim.startOffset = offset
+        anim.duration = duration
+        anim.setAnimationListener(object : Animation.AnimationListener {
+            override @KauUtils fun onAnimationRepeat(animation: Animation?) {}
+            override @KauUtils fun onAnimationEnd(animation: Animation?) = onFinish?.invoke() ?: Unit
+            override @KauUtils fun onAnimationStart(animation: Animation?) {
+                visible()
+                onStart?.invoke()
+            }
+        })
+        startAnimation(anim)
+    }
+}
+
+@KauUtils fun View.fadeOut(offset: Long = 0L, duration: Long = 200L, onStart: (() -> Unit)? = null, onFinish: (() -> Unit)? = null) {
+    if (!isAttachedToWindow) {
+        onStart?.invoke()
+        invisible()
+        onFinish?.invoke()
+        return
+    }
+    val anim = AnimationUtils.loadAnimation(context, android.R.anim.fade_out)
+    anim.startOffset = offset
+    anim.duration = duration
+    anim.setAnimationListener(object : Animation.AnimationListener {
+        override @KauUtils fun onAnimationRepeat(animation: Animation?) {}
+        override @KauUtils fun onAnimationEnd(animation: Animation?) {
+            invisible()
+            onFinish?.invoke()
+        }
+
+        override @KauUtils fun onAnimationStart(animation: Animation?) {
+            onStart?.invoke()
+        }
+    })
+    startAnimation(anim)
+}
+
+@KauUtils fun TextView.setTextWithFade(text: String, duration: Long = 200, onFinish: (() -> Unit)? = null) {
+    fadeOut(duration = duration, onFinish = {
+        setText(text)
+        fadeIn(duration = duration, onFinish = onFinish)
+    })
+}
+
+@KauUtils fun TextView.setTextWithFade(@StringRes textId: Int, duration: Long = 200, onFinish: (() -> Unit)? = null) = setTextWithFade(context.getString(textId), duration, onFinish)
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/ColorUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/ColorUtils.kt
new file mode 100644
index 0000000..8590d6f
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/ColorUtils.kt
@@ -0,0 +1,235 @@
+package ca.allanwang.kau.utils
+
+import android.content.Context
+import android.content.res.ColorStateList
+import android.graphics.Color
+import android.graphics.PorterDuff
+import android.graphics.drawable.Drawable
+import android.os.Build
+import android.support.annotation.ColorInt
+import android.support.annotation.FloatRange
+import android.support.annotation.IntRange
+import android.support.v4.content.ContextCompat
+import android.support.v4.graphics.drawable.DrawableCompat
+import android.support.v7.widget.AppCompatEditText
+import android.support.v7.widget.Toolbar
+import android.widget.*
+import com.afollestad.materialdialogs.R
+
+/**
+ * Created by Allan Wang on 2017-06-08.
+ */
+fun Int.isColorDark(): Boolean
+        = (0.299 * Color.red(this) + 0.587 * Color.green(this) + 0.114 * Color.blue(this)) / 255.0 < 0.5
+
+fun Int.toHexString(withAlpha: Boolean = false, withHexPrefix: Boolean = true): String {
+    val hex = if (withAlpha) String.format("#%08X", this)
+    else String.format("#%06X", 0xFFFFFF and this)
+    return if (withHexPrefix) hex else hex.substring(1)
+}
+
+fun Int.toRgbaString(): String = "rgba(${Color.red(this)}, ${Color.green(this)}, ${Color.blue(this)}, ${(Color.alpha(this) / 255f).round(3)})"
+
+fun Int.toHSV(): FloatArray {
+    val hsv = FloatArray(3)
+    Color.colorToHSV(this, hsv)
+    return hsv
+}
+
+fun FloatArray.toColor(): Int = Color.HSVToColor(this)
+
+fun Int.isColorVisibleOn(@ColorInt color: Int, @IntRange(from = 0L, to = 255L) delta: Int = 25,
+                         @IntRange(from = 0L, to = 255L) minAlpha: Int = 50): Boolean =
+        if (Color.alpha(this) < minAlpha) false
+        else !(Math.abs(Color.red(this) - Color.red(color)) < delta
+                && Math.abs(Color.green(this) - Color.green(color)) < delta
+                && Math.abs(Color.blue(this) - Color.blue(color)) < delta)
+
+
+@ColorInt
+fun Context.getDisabledColor(): Int {
+    val primaryColor = resolveColor(android.R.attr.textColorPrimary)
+    val disabledColor = if (primaryColor.isColorDark()) Color.BLACK else Color.WHITE
+    return disabledColor.adjustAlpha(0.3f)
+}
+
+@ColorInt
+fun Int.adjustAlpha(factor: Float): Int {
+    val alpha = Math.round(Color.alpha(this) * factor)
+    return Color.argb(alpha, Color.red(this), Color.green(this), Color.blue(this))
+}
+
+val Int.isColorTransparent: Boolean
+    get() = Color.alpha(this) != 255
+
+@ColorInt
+fun Int.withAlpha(@IntRange(from = 0L, to = 255L) alpha: Int): Int
+        = Color.argb(alpha, Color.red(this), Color.green(this), Color.blue(this))
+
+@ColorInt
+fun Int.withMinAlpha(@IntRange(from = 0L, to = 255L) alpha: Int): Int
+        = Color.argb(Math.max(alpha, Color.alpha(this)), Color.red(this), Color.green(this), Color.blue(this))
+
+@ColorInt
+fun Int.lighten(@FloatRange(from = 0.0, to = 1.0) factor: Float = 0.1f): Int {
+    val (red, green, blue) = intArrayOf(Color.red(this), Color.green(this), Color.blue(this))
+            .map { (it * (1f - factor) + 255f * factor).toInt() }
+    return Color.argb(Color.alpha(this), red, green, blue)
+}
+
+@ColorInt
+fun Int.darken(@FloatRange(from = 0.0, to = 1.0) factor: Float = 0.1f): Int {
+    val (red, green, blue) = intArrayOf(Color.red(this), Color.green(this), Color.blue(this))
+            .map { (it * (1f - factor)).toInt() }
+    return Color.argb(Color.alpha(this), red, green, blue)
+}
+
+@ColorInt
+fun Int.colorToBackground(@FloatRange(from = 0.0, to = 1.0) factor: Float = 0.1f): Int
+        = if (isColorDark()) darken(factor) else lighten(factor)
+
+@ColorInt
+fun Int.colorToForeground(@FloatRange(from = 0.0, to = 1.0) factor: Float = 0.1f): Int
+        = if (isColorDark()) lighten(factor) else darken(factor)
+
+@Throws(IllegalArgumentException::class)
+fun String.toColor(): Int {
+    val toParse: String
+    if (startsWith("#") && length == 4)
+        toParse = "#${this[1]}${this[1]}${this[2]}${this[2]}${this[3]}${this[3]}"
+    else
+        toParse = this
+    return Color.parseColor(toParse)
+}
+
+//Get ColorStateList
+fun Context.colorStateList(@ColorInt color: Int): ColorStateList {
+    val disabledColor = color.adjustAlpha(0.3f)
+    return ColorStateList(arrayOf(intArrayOf(android.R.attr.state_enabled, -android.R.attr.state_checked),
+            intArrayOf(android.R.attr.state_enabled, android.R.attr.state_checked),
+            intArrayOf(-android.R.attr.state_enabled, -android.R.attr.state_checked),
+            intArrayOf(-android.R.attr.state_enabled, android.R.attr.state_checked)),
+            intArrayOf(color.adjustAlpha(0.8f), color, disabledColor, disabledColor))
+}
+
+/*
+ * Tint Helpers
+ * Kotlin tint bindings that start with 'tint' so it doesn't conflict with existing methods
+ * Largely based on MDTintHelper
+ * https://github.com/afollestad/material-dialogs/blob/master/core/src/main/java/com/afollestad/materialdialogs/internal/MDTintHelper.java
+ */
+fun RadioButton.tint(colors: ColorStateList) {
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+        buttonTintList = colors
+    } else {
+        val radioDrawable = context.drawable(R.drawable.abc_btn_radio_material)
+        val d = DrawableCompat.wrap(radioDrawable)
+        DrawableCompat.setTintList(d, colors)
+        buttonDrawable = d
+    }
+}
+
+fun RadioButton.tint(@ColorInt color: Int) = tint(context.colorStateList(color))
+
+fun CheckBox.tint(colors: ColorStateList) {
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+        buttonTintList = colors
+    } else {
+        val checkDrawable = context.drawable(R.drawable.abc_btn_check_material)
+        val drawable = DrawableCompat.wrap(checkDrawable)
+        DrawableCompat.setTintList(drawable, colors)
+        buttonDrawable = drawable
+    }
+}
+
+fun CheckBox.tint(@ColorInt color: Int) = tint(context.colorStateList(color))
+
+fun SeekBar.tint(@ColorInt color: Int) {
+    val s1 = ColorStateList.valueOf(color)
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+        thumbTintList = s1
+        progressTintList = s1
+    } else if (Build.VERSION.SDK_INT > Build.VERSION_CODES.GINGERBREAD_MR1) {
+        val progressDrawable = DrawableCompat.wrap(progressDrawable)
+        this.progressDrawable = progressDrawable
+        DrawableCompat.setTintList(progressDrawable, s1)
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
+            val thumbDrawable = DrawableCompat.wrap(thumb)
+            DrawableCompat.setTintList(thumbDrawable, s1)
+            thumb = thumbDrawable
+        }
+    } else {
+        val mode: PorterDuff.Mode = if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.GINGERBREAD_MR1)
+            PorterDuff.Mode.MULTIPLY else PorterDuff.Mode.SRC_IN
+        indeterminateDrawable?.setColorFilter(color, mode)
+        progressDrawable?.setColorFilter(color, mode)
+    }
+}
+
+fun ProgressBar.tint(@ColorInt color: Int, skipIndeterminate: Boolean = false) {
+    val sl = ColorStateList.valueOf(color)
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+        progressTintList = sl
+        secondaryProgressTintList = sl
+        if (!skipIndeterminate) indeterminateTintList = sl
+    } else {
+        val mode: PorterDuff.Mode = if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.GINGERBREAD_MR1)
+            PorterDuff.Mode.MULTIPLY else PorterDuff.Mode.SRC_IN
+        indeterminateDrawable?.setColorFilter(color, mode)
+        progressDrawable?.setColorFilter(color, mode)
+    }
+}
+
+fun Context.textColorStateList(@ColorInt color: Int): ColorStateList {
+    val states = arrayOf(
+            intArrayOf(-android.R.attr.state_enabled),
+            intArrayOf(-android.R.attr.state_pressed, -android.R.attr.state_focused),
+            intArrayOf()
+    )
+    val colors = intArrayOf(
+            resolveColor(R.attr.colorControlNormal),
+            resolveColor(R.attr.colorControlNormal),
+            color
+    )
+    return ColorStateList(states, colors)
+}
+
+fun EditText.tint(@ColorInt color: Int) {
+    val editTextColorStateList = context.textColorStateList(color)
+    if (this is AppCompatEditText) {
+        supportBackgroundTintList = editTextColorStateList
+    } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+        backgroundTintList = editTextColorStateList
+    }
+    tintCursor(color)
+}
+
+fun EditText.tintCursor(@ColorInt color: Int) {
+    try {
+        val fCursorDrawableRes = TextView::class.java.getDeclaredField("mCursorDrawableRes")
+        fCursorDrawableRes.isAccessible = true
+        val mCursorDrawableRes = fCursorDrawableRes.getInt(this)
+        val fEditor = TextView::class.java.getDeclaredField("mEditor")
+        fEditor.isAccessible = true
+        val editor = fEditor.get(this)
+        val clazz = editor.javaClass
+        val fCursorDrawable = clazz.getDeclaredField("mCursorDrawable")
+        fCursorDrawable.isAccessible = true
+        val drawables: Array<Drawable> = Array(2, {
+            val drawable = ContextCompat.getDrawable(context, mCursorDrawableRes)
+            drawable.setColorFilter(color, PorterDuff.Mode.SRC_IN)
+            drawable
+        })
+        fCursorDrawable.set(editor, drawables)
+    } catch (e: Exception) {
+        e.printStackTrace()
+    }
+}
+
+fun Toolbar.tint(@ColorInt color: Int, tintTitle: Boolean = true) {
+    if (tintTitle) {
+        setTitleTextColor(color)
+        setSubtitleTextColor(color)
+    }
+    (0 until childCount).asSequence().forEach { (getChildAt(it) as? ImageButton)?.setColorFilter(color) }
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/Const.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/Const.kt
new file mode 100644
index 0000000..944caa4
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/Const.kt
@@ -0,0 +1,6 @@
+package ca.allanwang.kau.utils
+
+/**
+ * Created by Allan Wang on 2017-06-08.
+ */
+const val ANDROID_NAMESPACE = "http://schemas.android.com/apk/res/android"
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/ContextUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/ContextUtils.kt
new file mode 100644
index 0000000..21021e2
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/ContextUtils.kt
@@ -0,0 +1,165 @@
+package ca.allanwang.kau.utils
+
+import android.app.Activity
+import android.app.ActivityOptions
+import android.content.Context
+import android.content.Intent
+import android.content.pm.PackageManager
+import android.graphics.drawable.Drawable
+import android.net.ConnectivityManager
+import android.net.Uri
+import android.os.Bundle
+import android.support.annotation.*
+import android.support.v4.app.ActivityOptionsCompat
+import android.support.v4.content.ContextCompat
+import android.util.TypedValue
+import android.view.View
+import android.widget.Toast
+import ca.allanwang.kau.R
+import ca.allanwang.kau.logging.KL
+import com.afollestad.materialdialogs.MaterialDialog
+
+
+/**
+ * Created by Allan Wang on 2017-06-03.
+ */
+fun Context.startActivity(
+        clazz: Class<out Activity>,
+        clearStack: Boolean = false,
+        transition: Boolean = false,
+        bundle: Bundle? = null,
+        intentBuilder: Intent.() -> Unit = {}) {
+    val intent = (Intent(this, clazz))
+    if (clearStack) intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK or Intent.FLAG_ACTIVITY_NEW_TASK)
+    intent.intentBuilder()
+    val fullBundle = if (transition && this is Activity) ActivityOptions.makeSceneTransitionAnimation(this).toBundle() else Bundle()
+    if (transition && this !is Activity) KL.d("Cannot make scene transition when context is not an instance of an Activity")
+    if (bundle != null) fullBundle.putAll(bundle)
+    ContextCompat.startActivity(this, intent, if (fullBundle.isEmpty) null else fullBundle)
+    if (this is Activity && clearStack) finish()
+}
+
+/**
+ * Bring in activity from the right
+ */
+fun Context.startActivitySlideIn(clazz: Class<out Activity>, clearStack: Boolean = false, intentBuilder: Intent.() -> Unit = {}, bundleBuilder: Bundle.() -> Unit = {}) {
+    val bundle = ActivityOptionsCompat.makeCustomAnimation(this, R.anim.kau_slide_in_right, R.anim.kau_fade_out).toBundle()
+    bundle.bundleBuilder()
+    startActivity(clazz, clearStack, intentBuilder = intentBuilder, bundle = bundle)
+}
+
+/**
+ * Bring in activity from behind while pushing the current activity to the right
+ * This replicates the exit animation of a sliding activity, but is a forward creation
+ * For the animation to work, the previous activity should not be in the stack (otherwise you wouldn't need this in the first place)
+ * Consequently, the stack will be cleared by default
+ */
+fun Context.startActivitySlideOut(clazz: Class<out Activity>, clearStack: Boolean = true, intentBuilder: Intent.() -> Unit = {}, bundleBuilder: Bundle.() -> Unit = {}) {
+    val bundle = ActivityOptionsCompat.makeCustomAnimation(this, R.anim.kau_fade_in, R.anim.kau_slide_out_right_top).toBundle()
+    bundle.bundleBuilder()
+    startActivity(clazz, clearStack, intentBuilder = intentBuilder, bundle = bundle)
+}
+
+fun Context.startPlayStoreLink(@StringRes packageIdRes: Int) = startPlayStoreLink(string(packageIdRes))
+
+fun Context.startPlayStoreLink(packageId: String) {
+    startActivity(Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=$packageId")))
+}
+
+/**
+ * Starts a url
+ * If given a series of links, will open the first one that isn't null
+ */
+fun Context.startLink(vararg url: String?) {
+    val link = url.firstOrNull { !it.isNullOrBlank() } ?: return
+    val browserIntent = Intent(Intent.ACTION_VIEW, Uri.parse(link))
+    startActivity(browserIntent)
+}
+
+//Toast helpers
+fun Context.toast(@StringRes id: Int, duration: Int = Toast.LENGTH_LONG) = toast(this.string(id), duration)
+
+fun Context.toast(text: String, duration: Int = Toast.LENGTH_LONG) {
+    Toast.makeText(this, text, duration).show()
+}
+
+//Resource retrievers
+fun Context.string(@StringRes id: Int): String = getString(id)
+
+fun Context.string(@StringRes id: Int, fallback: String?): String? = if (id > 0) string(id) else fallback
+fun Context.string(holder: StringHolder?): String? = holder?.getString(this)
+fun Context.color(@ColorRes id: Int): Int = ContextCompat.getColor(this, id)
+fun Context.integer(@IntegerRes id: Int): Int = resources.getInteger(id)
+fun Context.dimen(@DimenRes id: Int): Float = resources.getDimension(id)
+fun Context.dimenPixelSize(@DimenRes id: Int): Int = resources.getDimensionPixelSize(id)
+fun Context.drawable(@DrawableRes id: Int): Drawable = ContextCompat.getDrawable(this, id)
+fun Context.drawable(@DrawableRes id: Int, fallback: Drawable?): Drawable? = if (id > 0) drawable(id) else fallback
+
+//Attr retrievers
+fun Context.resolveColor(@AttrRes attr: Int, fallback: Int = 0): Int {
+    val a = theme.obtainStyledAttributes(intArrayOf(attr))
+    try {
+        return a.getColor(0, fallback)
+    } finally {
+        a.recycle()
+    }
+}
+
+fun Context.resolveDrawable(@AttrRes attr: Int): Drawable? {
+    val a = theme.obtainStyledAttributes(intArrayOf(attr))
+    try {
+        return a.getDrawable(0)
+    } finally {
+        a.recycle()
+    }
+}
+
+fun Context.resolveBoolean(@AttrRes attr: Int, fallback: Boolean = false): Boolean {
+    val a = theme.obtainStyledAttributes(intArrayOf(attr))
+    try {
+        return a.getBoolean(0, fallback)
+    } finally {
+        a.recycle()
+    }
+}
+
+fun Context.resolveString(@AttrRes attr: Int, fallback: String = ""): String {
+    val v = TypedValue()
+    return if (theme.resolveAttribute(attr, v, true)) v.string.toString() else fallback
+}
+
+/**
+ * Wrapper function for the MaterialDialog adapterBuilder
+ * There is no need to call build() or show() as those are done by default
+ */
+inline fun Context.materialDialog(action: MaterialDialog.Builder.() -> Unit): MaterialDialog {
+    val builder = MaterialDialog.Builder(this)
+    builder.action()
+    return builder.show()
+}
+
+inline val Context.isNetworkAvailable: Boolean
+    get() {
+        val connectivityManager = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
+        val activeNetworkInfo = connectivityManager.activeNetworkInfo
+        return activeNetworkInfo != null && activeNetworkInfo.isConnectedOrConnecting
+    }
+
+fun Context.getDip(value: Float): Float = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, value, resources.displayMetrics)
+
+inline val Context.isRtl: Boolean
+    get() = resources.configuration.layoutDirection == View.LAYOUT_DIRECTION_RTL
+
+/**
+ * Determine if the navigation bar will be on the bottom of the screen, based on logic in
+ * PhoneWindowManager.
+ */
+inline val Context.isNavBarOnBottom: Boolean
+    get() {
+        val cfg = resources.configuration
+        val dm = resources.displayMetrics
+        val canMove = dm.widthPixels != dm.heightPixels && cfg.smallestScreenWidthDp < 600
+        return !canMove || dm.widthPixels < dm.heightPixels
+    }
+
+fun Context.hasPermission(permissions: String) = !buildIsMarshmallowAndUp || ContextCompat.checkSelfPermission(this, permissions) == PackageManager.PERMISSION_GRANTED
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/Either.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/Either.kt
new file mode 100644
index 0000000..dab5810
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/Either.kt
@@ -0,0 +1,32 @@
+package ca.allanwang.kau.utils
+
+/**
+ * Created by Allan Wang on 2017-06-17.
+ *
+ * Courtesy of adelnizamutdinov
+ *
+ * https://github.com/adelnizamutdinov/kotlin-either
+ */
+@Suppress("unused")
+sealed class Either<out L, out R>
+
+data class Left<out T>(val value: T) : Either<T, Nothing>()
+data class Right<out T>(val value: T) : Either<Nothing, T>()
+
+inline fun <L, R, T> Either<L, R>.fold(left: (L) -> T, right: (R) -> T): T =
+        when (this) {
+            is Left -> left(value)
+            is Right -> right(value)
+        }
+
+inline fun <L, R, T> Either<L, R>.flatMap(f: (R) -> Either<L, T>): Either<L, T> =
+        fold({ this as Left }, f)
+
+inline fun <L, R, T> Either<L, R>.map(f: (R) -> T): Either<L, T> =
+        flatMap { Right(f(it)) }
+
+val <T> Either<T, *>.isLeft: Boolean
+    get() = this is Left<T>
+
+val <T> Either<*, T>.isRight: Boolean
+    get() = this is Right<T>
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/FontUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/FontUtils.kt
new file mode 100644
index 0000000..3fc509d
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/FontUtils.kt
@@ -0,0 +1,29 @@
+package ca.allanwang.kau.utils
+
+import android.content.Context
+import android.graphics.Typeface
+
+/**
+ * Created by Allan Wang on 2017-06-28.
+ */
+object FontUtils {
+
+    val sTypefaceCache: MutableMap<String, Typeface> = mutableMapOf()
+
+    fun get(context: Context, font: String): Typeface {
+        synchronized(sTypefaceCache) {
+            if (!sTypefaceCache.containsKey(font)) {
+                val tf = Typeface.createFromAsset(
+                        context.applicationContext.assets, "fonts/$font.ttf")
+                sTypefaceCache.put(font, tf)
+            }
+            return sTypefaceCache.get(font) ?: throw IllegalArgumentException("Font error; typeface does not exist at assets/fonts$font.ttf")
+        }
+    }
+
+    fun getName(typeface: Typeface): String? = sTypefaceCache.entries.firstOrNull { it.value == typeface }?.key
+
+}
+
+fun Context.getFont(font: String) = FontUtils.get(this, font)
+fun Context.getFontName(typeface: Typeface) = FontUtils.getName(typeface)
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/FragmentUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/FragmentUtils.kt
new file mode 100644
index 0000000..acc71f2
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/FragmentUtils.kt
@@ -0,0 +1,12 @@
+package ca.allanwang.kau.utils
+
+import android.support.v4.app.Fragment
+import org.jetbrains.anko.bundleOf
+
+/**
+ * Created by Allan Wang on 2017-07-02.
+ */
+fun <T : Fragment> T.withArguments(vararg params: Pair<String, Any>): T {
+    arguments = bundleOf(*params)
+    return this
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/IIconUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/IIconUtils.kt
new file mode 100644
index 0000000..03a1605
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/IIconUtils.kt
@@ -0,0 +1,20 @@
+package ca.allanwang.kau.utils
+
+import android.content.Context
+import android.content.res.ColorStateList
+import android.graphics.Color
+import android.graphics.drawable.Drawable
+import android.support.annotation.ColorInt
+import com.mikepenz.iconics.IconicsDrawable
+import com.mikepenz.iconics.typeface.IIcon
+
+/**
+ * Created by Allan Wang on 2017-05-29.
+ */
+@KauUtils fun IIcon.toDrawable(c: Context, sizeDp: Int = 24, @ColorInt color: Int = Color.WHITE, builder: IconicsDrawable.() -> Unit = {}): Drawable {
+    val state = ColorStateList.valueOf(color)
+    val icon = IconicsDrawable(c).icon(this).sizeDp(sizeDp)
+    icon.setTintList(state)
+    icon.builder()
+    return icon
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/Kotterknife.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/Kotterknife.kt
new file mode 100644
index 0000000..247bbc7
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/Kotterknife.kt
@@ -0,0 +1,166 @@
+package ca.allanwang.kau.utils
+
+/**
+ * Created by Allan Wang on 2017-05-29.
+ *
+ * Courtesy of Jake Wharton
+ *
+ * https://github.com/JakeWharton/kotterknife/blob/master/src/main/kotlin/kotterknife/ButterKnife.kt
+ */
+import android.app.Activity
+import android.app.Dialog
+import android.app.DialogFragment
+import android.app.Fragment
+import android.support.v7.widget.RecyclerView.ViewHolder
+import android.view.View
+import kotlin.properties.ReadOnlyProperty
+import kotlin.reflect.KProperty
+import android.support.v4.app.DialogFragment as SupportDialogFragment
+import android.support.v4.app.Fragment as SupportFragment
+
+fun <V : View> View.bindView(id: Int)
+        : ReadOnlyProperty<View, V> = required(id, viewFinder)
+
+fun <V : View> Activity.bindView(id: Int)
+        : ReadOnlyProperty<Activity, V> = required(id, viewFinder)
+
+fun <V : View> Dialog.bindView(id: Int)
+        : ReadOnlyProperty<Dialog, V> = required(id, viewFinder)
+
+fun <V : View> DialogFragment.bindView(id: Int)
+        : ReadOnlyProperty<DialogFragment, V> = required(id, viewFinder)
+
+fun <V : View> android.support.v4.app.DialogFragment.bindView(id: Int)
+        : ReadOnlyProperty<android.support.v4.app.DialogFragment, V> = required(id, viewFinder)
+
+fun <V : View> Fragment.bindView(id: Int)
+        : ReadOnlyProperty<Fragment, V> = required(id, viewFinder)
+
+fun <V : View> android.support.v4.app.Fragment.bindView(id: Int)
+        : ReadOnlyProperty<android.support.v4.app.Fragment, V> = required(id, viewFinder)
+
+fun <V : View> ViewHolder.bindView(id: Int)
+        : ReadOnlyProperty<ViewHolder, V> = required(id, viewFinder)
+
+fun <V : View> View.bindOptionalView(id: Int)
+        : ReadOnlyProperty<View, V?> = optional(id, viewFinder)
+
+fun <V : View> Activity.bindOptionalView(id: Int)
+        : ReadOnlyProperty<Activity, V?> = optional(id, viewFinder)
+
+fun <V : View> Dialog.bindOptionalView(id: Int)
+        : ReadOnlyProperty<Dialog, V?> = optional(id, viewFinder)
+
+fun <V : View> DialogFragment.bindOptionalView(id: Int)
+        : ReadOnlyProperty<DialogFragment, V?> = optional(id, viewFinder)
+
+fun <V : View> android.support.v4.app.DialogFragment.bindOptionalView(id: Int)
+        : ReadOnlyProperty<android.support.v4.app.DialogFragment, V?> = optional(id, viewFinder)
+
+fun <V : View> Fragment.bindOptionalView(id: Int)
+        : ReadOnlyProperty<Fragment, V?> = optional(id, viewFinder)
+
+fun <V : View> android.support.v4.app.Fragment.bindOptionalView(id: Int)
+        : ReadOnlyProperty<android.support.v4.app.Fragment, V?> = optional(id, viewFinder)
+
+fun <V : View> ViewHolder.bindOptionalView(id: Int)
+        : ReadOnlyProperty<ViewHolder, V?> = optional(id, viewFinder)
+
+fun <V : View> View.bindViews(vararg ids: Int)
+        : ReadOnlyProperty<View, List<V>> = required(ids, viewFinder)
+
+fun <V : View> Activity.bindViews(vararg ids: Int)
+        : ReadOnlyProperty<Activity, List<V>> = required(ids, viewFinder)
+
+fun <V : View> Dialog.bindViews(vararg ids: Int)
+        : ReadOnlyProperty<Dialog, List<V>> = required(ids, viewFinder)
+
+fun <V : View> DialogFragment.bindViews(vararg ids: Int)
+        : ReadOnlyProperty<DialogFragment, List<V>> = required(ids, viewFinder)
+
+fun <V : View> android.support.v4.app.DialogFragment.bindViews(vararg ids: Int)
+        : ReadOnlyProperty<android.support.v4.app.DialogFragment, List<V>> = required(ids, viewFinder)
+
+fun <V : View> Fragment.bindViews(vararg ids: Int)
+        : ReadOnlyProperty<Fragment, List<V>> = required(ids, viewFinder)
+
+fun <V : View> android.support.v4.app.Fragment.bindViews(vararg ids: Int)
+        : ReadOnlyProperty<android.support.v4.app.Fragment, List<V>> = required(ids, viewFinder)
+
+fun <V : View> ViewHolder.bindViews(vararg ids: Int)
+        : ReadOnlyProperty<ViewHolder, List<V>> = required(ids, viewFinder)
+
+fun <V : View> View.bindOptionalViews(vararg ids: Int)
+        : ReadOnlyProperty<View, List<V>> = optional(ids, viewFinder)
+
+fun <V : View> Activity.bindOptionalViews(vararg ids: Int)
+        : ReadOnlyProperty<Activity, List<V>> = optional(ids, viewFinder)
+
+fun <V : View> Dialog.bindOptionalViews(vararg ids: Int)
+        : ReadOnlyProperty<Dialog, List<V>> = optional(ids, viewFinder)
+
+fun <V : View> DialogFragment.bindOptionalViews(vararg ids: Int)
+        : ReadOnlyProperty<DialogFragment, List<V>> = optional(ids, viewFinder)
+
+fun <V : View> android.support.v4.app.DialogFragment.bindOptionalViews(vararg ids: Int)
+        : ReadOnlyProperty<android.support.v4.app.DialogFragment, List<V>> = optional(ids, viewFinder)
+
+fun <V : View> Fragment.bindOptionalViews(vararg ids: Int)
+        : ReadOnlyProperty<Fragment, List<V>> = optional(ids, viewFinder)
+
+fun <V : View> android.support.v4.app.Fragment.bindOptionalViews(vararg ids: Int)
+        : ReadOnlyProperty<android.support.v4.app.Fragment, List<V>> = optional(ids, viewFinder)
+
+fun <V : View> ViewHolder.bindOptionalViews(vararg ids: Int)
+        : ReadOnlyProperty<ViewHolder, List<V>> = optional(ids, viewFinder)
+
+private val View.viewFinder: View.(Int) -> View?
+    get() = { findViewById(it) }
+private val Activity.viewFinder: Activity.(Int) -> View?
+    get() = { findViewById(it) }
+private val Dialog.viewFinder: Dialog.(Int) -> View?
+    get() = { findViewById(it) }
+private val DialogFragment.viewFinder: DialogFragment.(Int) -> View?
+    get() = { dialog.findViewById(it) }
+private val android.support.v4.app.DialogFragment.viewFinder: android.support.v4.app.DialogFragment.(Int) -> View?
+    get() = { dialog.findViewById(it) }
+private val Fragment.viewFinder: Fragment.(Int) -> View?
+    get() = { view.findViewById(it) }
+private val android.support.v4.app.Fragment.viewFinder: android.support.v4.app.Fragment.(Int) -> View?
+    get() = { view!!.findViewById(it) }
+private val ViewHolder.viewFinder: ViewHolder.(Int) -> View?
+    get() = { itemView.findViewById(it) }
+
+private fun viewNotFound(id: Int, desc: KProperty<*>): Nothing =
+        throw IllegalStateException("View ID $id for '${desc.name}' not found.")
+
+@Suppress("UNCHECKED_CAST")
+private fun <T, V : View> required(id: Int, finder: T.(Int) -> View?)
+        = Lazy { t: T, desc -> (t.finder(id) as V?)?.apply { } ?: viewNotFound(id, desc) }
+
+@Suppress("UNCHECKED_CAST")
+private fun <T, V : View> optional(id: Int, finder: T.(Int) -> View?)
+        = Lazy { t: T, _ -> t.finder(id) as V? }
+
+@Suppress("UNCHECKED_CAST")
+private fun <T, V : View> required(ids: IntArray, finder: T.(Int) -> View?)
+        = Lazy { t: T, desc -> ids.map { t.finder(it) as V? ?: viewNotFound(it, desc) } }
+
+@Suppress("UNCHECKED_CAST")
+private fun <T, V : View> optional(ids: IntArray, finder: T.(Int) -> View?)
+        = Lazy { t: T, _ -> ids.map { t.finder(it) as V? }.filterNotNull() }
+
+// Like Kotlin's lazy delegate but the initializer gets the target and metadata passed to it
+private class Lazy<T, V>(private val initializer: (T, KProperty<*>) -> V) : ReadOnlyProperty<T, V> {
+    private object EMPTY
+
+    private var value: Any? = EMPTY
+
+    override fun getValue(thisRef: T, property: KProperty<*>): V {
+        if (value == EMPTY) {
+            value = initializer(thisRef, property)
+        }
+        @Suppress("UNCHECKED_CAST")
+        return value as V
+    }
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/PackageUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/PackageUtils.kt
new file mode 100644
index 0000000..837c209
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/PackageUtils.kt
@@ -0,0 +1,48 @@
+package ca.allanwang.kau.utils
+
+import android.content.Context
+import android.content.pm.PackageManager
+import android.os.Build
+import android.support.annotation.RequiresApi
+
+/**
+ * Created by Allan Wang on 2017-06-23.
+ */
+
+/**
+ * Checks if a given package is installed
+ * @param packageName packageId
+ * @return true if installed with activity, false otherwise
+ */
+@KauUtils fun Context.isAppInstalled(packageName: String): Boolean {
+    val pm = packageManager
+    var installed: Boolean
+    try {
+        pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES)
+        installed = true
+    } catch (e: PackageManager.NameNotFoundException) {
+        installed = false
+    }
+    return installed
+}
+
+val buildIsLollipopAndUp: Boolean
+    get() = Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP
+
+val buildIsMarshmallowAndUp: Boolean
+    get() = Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
+
+val buildIsNougatAndUp: Boolean
+    get() = Build.VERSION.SDK_INT >= Build.VERSION_CODES.N
+
+const val INSTALLER_GOOGLE_PLAY_VENDING = "com.android.vending"
+const val INSTALLER_GOOGLE_PLAY_FEEDBACK = "com.google.android.feedback"
+
+val Context.installerPackageName: String?
+    get() = packageManager.getInstallerPackageName(packageName)
+
+val Context.isFromGooglePlay: Boolean
+    get() {
+        val installer = installerPackageName
+        return arrayOf(INSTALLER_GOOGLE_PLAY_FEEDBACK, INSTALLER_GOOGLE_PLAY_VENDING).any { it == installer }
+    }
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/StringHolder.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/StringHolder.kt
new file mode 100644
index 0000000..e70a2d1
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/StringHolder.kt
@@ -0,0 +1,22 @@
+package ca.allanwang.kau.utils
+
+import android.content.Context
+import android.support.annotation.StringRes
+
+/**
+ * Created by Allan Wang on 2017-06-08.
+ */
+class StringHolder {
+    var text: String? = null
+    var textRes: Int = 0
+
+    constructor(@StringRes textRes: Int) {
+        this.textRes = textRes
+    }
+
+    constructor(text: String) {
+        this.text = text
+    }
+
+    fun getString(context: Context) = context.string(textRes, text)
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/TransitionUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/TransitionUtils.kt
new file mode 100644
index 0000000..9e668d0
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/TransitionUtils.kt
@@ -0,0 +1,19 @@
+package ca.allanwang.kau.utils
+
+import android.support.transition.Transition
+import android.support.transition.TransitionSet
+
+/**
+ * Created by Allan Wang on 2017-06-24.
+ */
+class TransitionEndListener(val onEnd: (transition: Transition) -> Unit) : Transition.TransitionListener {
+    override fun onTransitionEnd(transition: Transition) = onEnd(transition)
+    override fun onTransitionResume(transition: Transition) {}
+    override fun onTransitionPause(transition: Transition) {}
+    override fun onTransitionCancel(transition: Transition) {}
+    override fun onTransitionStart(transition: Transition) {}
+}
+
+@KauUtils fun TransitionSet.addEndListener(onEnd: (transition: Transition) -> Unit) {
+    addListener(TransitionEndListener(onEnd))
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/Utils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/Utils.kt
new file mode 100644
index 0000000..84794f9
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/Utils.kt
@@ -0,0 +1,111 @@
+package ca.allanwang.kau.utils
+
+import android.content.Context
+import android.content.res.Resources
+import android.graphics.Bitmap
+import android.graphics.Canvas
+import android.graphics.drawable.BitmapDrawable
+import android.graphics.drawable.Drawable
+import android.os.Handler
+import android.os.Looper
+import android.support.annotation.IntRange
+import ca.allanwang.kau.R
+import ca.allanwang.kau.logging.KL
+import java.math.RoundingMode
+import java.text.DecimalFormat
+
+
+/**
+ * Created by Allan Wang on 2017-05-28.
+ */
+
+/**
+ * Markers to isolate respective extension @KauUtils functions to their extended class
+ * Avoids having a whole bunch of methods for nested calls
+ */
+@DslMarker
+annotation class KauUtils
+
+@KauUtils val Int.dpToPx: Int
+    get() = (this * Resources.getSystem().displayMetrics.density).toInt()
+
+@KauUtils val Int.pxToDp: Int
+    get() = (this / Resources.getSystem().displayMetrics.density).toInt()
+
+/**
+ * Log whether current state is in the main thread
+ */
+@KauUtils fun checkThread(id: Int) {
+    val status = if (Looper.myLooper() == Looper.getMainLooper()) "is" else "is not"
+    KL.d("$id $status in the main thread")
+}
+
+/**
+ * Converts minute value to string
+ * Whole hours and days will be converted as such, otherwise it will default to x minutes
+ */
+@KauUtils fun Context.minuteToText(minutes: Long): String = with(minutes) {
+    if (this < 0L) string(R.string.kau_none)
+    else if (this == 60L) string(R.string.kau_one_hour)
+    else if (this == 1440L) string(R.string.kau_one_day)
+    else if (this % 1440L == 0L) String.format(string(R.string.kau_x_days), this / 1440L)
+    else if (this % 60L == 0L) String.format(string(R.string.kau_x_hours), this / 60L)
+    else String.format(string(R.string.kau_x_minutes), this)
+}
+
+@KauUtils fun Number.round(@IntRange(from = 1L) decimalCount: Int): String {
+    val expression = StringBuilder().append("#.")
+    (1..decimalCount).forEach { expression.append("#") }
+    val formatter = DecimalFormat(expression.toString())
+    formatter.roundingMode = RoundingMode.HALF_UP
+    return formatter.format(this)
+}
+
+/**
+ * Extracts the bitmap of a drawable, and applies a scale if given
+ * For solid colors, a 1 x 1 pixel will be generated
+ */
+@KauUtils fun Drawable.toBitmap(scaling: Float = 1f, config: Bitmap.Config = Bitmap.Config.ARGB_8888): Bitmap {
+    if (this is BitmapDrawable && bitmap != null) {
+        if (scaling == 1f) return bitmap
+        val width = (bitmap.width * scaling).toInt()
+        val height = (bitmap.height * scaling).toInt()
+        return Bitmap.createScaledBitmap(bitmap, width, height, false)
+    }
+    val bitmap = if (intrinsicWidth <= 0 || intrinsicHeight <= 0)
+        Bitmap.createBitmap(1, 1, config)
+    else
+        Bitmap.createBitmap((intrinsicWidth * scaling).toInt(), (intrinsicHeight * scaling).toInt(), config)
+    val canvas = Canvas(bitmap)
+    setBounds(0, 0, canvas.width, canvas.height)
+    draw(canvas)
+    return bitmap
+}
+
+/**
+ * Use block for autocloseables
+ */
+inline fun <T : AutoCloseable, R> T.use(block: (T) -> R): R {
+    var closed = false
+    try {
+        return block(this)
+    } catch (e: Exception) {
+        closed = true
+        try {
+            close()
+        } catch (closeException: Exception) {
+            e.addSuppressed(closeException)
+        }
+        throw e
+    } finally {
+        if (!closed) {
+            close()
+        }
+    }
+}
+
+fun postDelayed(delay: Long, action: () -> Unit) {
+    Handler().postDelayed(action, delay)
+}
+
+class KauException(message: String) : RuntimeException(message)
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/ViewUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/ViewUtils.kt
new file mode 100644
index 0000000..b4752a5
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/ViewUtils.kt
@@ -0,0 +1,126 @@
+package ca.allanwang.kau.utils
+
+import android.content.Context
+import android.graphics.Color
+import android.graphics.Outline
+import android.graphics.Rect
+import android.support.annotation.ColorInt
+import android.support.annotation.StringRes
+import android.support.annotation.TransitionRes
+import android.support.design.widget.Snackbar
+import android.support.transition.AutoTransition
+import android.support.transition.Transition
+import android.support.transition.TransitionInflater
+import android.support.transition.TransitionManager
+import android.support.v7.widget.LinearLayoutManager
+import android.support.v7.widget.RecyclerView
+import android.view.View
+import android.view.ViewGroup
+import android.view.ViewOutlineProvider
+import android.view.inputmethod.InputMethodManager
+import android.widget.ImageView
+import android.widget.TextView
+import ca.allanwang.kau.logging.KL
+import ca.allanwang.kau.views.createSimpleRippleDrawable
+import com.mikepenz.iconics.IconicsDrawable
+import com.mikepenz.iconics.typeface.IIcon
+
+
+/**
+ * Created by Allan Wang on 2017-05-31.
+ */
+@KauUtils fun <T : View> T.visible(): T {
+    visibility = View.VISIBLE
+    return this
+}
+
+@KauUtils fun <T : View> T.invisible(): T {
+    visibility = View.INVISIBLE
+    return this
+}
+
+@KauUtils fun <T : View> T.gone(): T {
+    visibility = View.GONE
+    return this
+}
+
+@KauUtils fun View.isVisible(): Boolean = visibility == View.VISIBLE
+@KauUtils fun View.isInvisible(): Boolean = visibility == View.INVISIBLE
+@KauUtils fun View.isGone(): Boolean = visibility == View.GONE
+
+fun View.snackbar(text: String, duration: Int = Snackbar.LENGTH_LONG, builder: Snackbar.() -> Unit = {}): Snackbar {
+    val snackbar = Snackbar.make(this, text, duration)
+    snackbar.builder()
+    snackbar.show()
+    return snackbar
+}
+
+fun View.snackbar(@StringRes textId: Int, duration: Int = Snackbar.LENGTH_LONG, builder: Snackbar.() -> Unit = {})
+        = snackbar(context.string(textId), duration, builder)
+
+@KauUtils fun TextView.setTextIfValid(@StringRes id: Int) {
+    if (id > 0) text = context.string(id)
+}
+
+@KauUtils fun ImageView.setIcon(icon: IIcon?, sizeDp: Int = 24, @ColorInt color: Int = Color.WHITE, builder: IconicsDrawable.() -> Unit = {}) {
+    if (icon == null) return
+    setImageDrawable(icon.toDrawable(context, sizeDp = sizeDp, color = color, builder = builder))
+}
+
+@KauUtils fun View.hideKeyboard() {
+    clearFocus()
+    (context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager).hideSoftInputFromWindow(windowToken, 0)
+}
+
+@KauUtils fun View.showKeyboard() {
+    requestFocus()
+    (context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager).showSoftInput(this, InputMethodManager.SHOW_IMPLICIT)
+}
+
+@KauUtils fun ViewGroup.transitionAuto(builder: AutoTransition.() -> Unit = {}) {
+    val transition = AutoTransition()
+    transition.builder()
+    TransitionManager.beginDelayedTransition(this, transition)
+}
+
+@KauUtils fun ViewGroup.transitionDelayed(@TransitionRes id: Int, builder: Transition.() -> Unit = {}) {
+    val transition = TransitionInflater.from(context).inflateTransition(id)
+    transition.builder()
+    TransitionManager.beginDelayedTransition(this, transition)
+}
+
+@KauUtils fun View.setRippleBackground(@ColorInt foregroundColor: Int, @ColorInt backgroundColor: Int) {
+    background = createSimpleRippleDrawable(foregroundColor, backgroundColor)
+}
+
+@KauUtils val View.parentViewGroup: ViewGroup
+    get() = parent as ViewGroup
+
+@KauUtils val View.parentVisibleHeight: Int
+    get() {
+        val r = Rect()
+        parentViewGroup.getWindowVisibleDisplayFrame(r)
+        return r.height()
+    }
+
+val CIRCULAR_OUTLINE: ViewOutlineProvider = object : ViewOutlineProvider() {
+    override fun getOutline(view: View, outline: Outline) {
+        KL.d("CIRCULAR OUTLINE")
+        outline.setOval(view.paddingLeft,
+                view.paddingTop,
+                view.width - view.paddingRight,
+                view.height - view.paddingBottom)
+    }
+}
+
+/**
+ * Generates a recycler view with match parent and a linearlayoutmanager, since it's so commonly used
+ */
+fun Context.fullLinearRecycler(rvAdapter: RecyclerView.Adapter<*>? = null, configs: RecyclerView.() -> Unit = {}): RecyclerView {
+    return RecyclerView(this).apply {
+        layoutManager = LinearLayoutManager(this@fullLinearRecycler)
+        layoutParams = RecyclerView.LayoutParams(RecyclerView.LayoutParams.MATCH_PARENT, RecyclerView.LayoutParams.MATCH_PARENT)
+        if (rvAdapter != null) adapter = rvAdapter
+        configs()
+    }
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/views/BoundedCardView.kt b/core/src/main/kotlin/ca/allanwang/kau/views/BoundedCardView.kt
new file mode 100644
index 0000000..0cb65d0
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/views/BoundedCardView.kt
@@ -0,0 +1,50 @@
+package ca.allanwang.kau.views
+
+import android.content.Context
+import android.graphics.Rect
+import android.support.v7.widget.CardView
+import android.util.AttributeSet
+import ca.allanwang.kau.R
+import ca.allanwang.kau.utils.parentViewGroup
+import ca.allanwang.kau.utils.parentVisibleHeight
+
+
+/**
+ * Created by Allan Wang on 2017-06-26.
+ *
+ * CardView with a limited height
+ * This view should be used with wrap_content as its height
+ * Defaults to at most the parent's visible height
+ */
+class BoundedCardView @JvmOverloads constructor(
+        context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
+) : CardView(context, attrs, defStyleAttr) {
+
+    /**
+     * Maximum height possible, defined in dp (will be converted to px)
+     * Defaults to parent's visible height
+     */
+    var maxHeight: Int = -1
+    /**
+     * Percentage of resulting max height to fill
+     * Negative value = fill all of maxHeight
+     */
+    var maxHeightPercent: Float = -1.0f
+
+    init {
+        if (attrs != null) {
+            val styledAttrs = context.obtainStyledAttributes(attrs, R.styleable.BoundedCardView)
+            maxHeight = styledAttrs.getDimensionPixelSize(R.styleable.BoundedCardView_maxHeight, -1)
+            maxHeightPercent = styledAttrs.getFloat(R.styleable.BoundedCardView_maxHeightPercent, -1.0f)
+            styledAttrs.recycle()
+        }
+    }
+
+    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
+        var maxMeasureHeight = if (maxHeight > 0) maxHeight else parentVisibleHeight
+        if (maxHeightPercent > 0f) maxMeasureHeight = (maxMeasureHeight * maxHeightPercent).toInt()
+        val trueHeightMeasureSpec = MeasureSpec.makeMeasureSpec(maxMeasureHeight, MeasureSpec.AT_MOST)
+        super.onMeasure(widthMeasureSpec, trueHeightMeasureSpec)
+    }
+
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/views/CutoutView.kt b/core/src/main/kotlin/ca/allanwang/kau/views/CutoutView.kt
new file mode 100644
index 0000000..023bdb4
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/views/CutoutView.kt
@@ -0,0 +1,183 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ca.allanwang.kau.views
+
+import android.content.Context
+import android.graphics.*
+import android.graphics.drawable.Drawable
+import android.text.TextPaint
+import android.util.AttributeSet
+import android.util.DisplayMetrics
+import android.util.TypedValue
+import android.view.View
+import ca.allanwang.kau.R
+import ca.allanwang.kau.utils.dimenPixelSize
+import ca.allanwang.kau.utils.getFont
+import ca.allanwang.kau.utils.parentVisibleHeight
+import ca.allanwang.kau.utils.toBitmap
+
+/**
+ * A view which punches out some text from an opaque color block, allowing you to see through it.
+ */
+class CutoutView @JvmOverloads constructor(
+        context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
+) : View(context, attrs, defStyleAttr) {
+
+    companion object {
+        const val PHI = 1.6182f
+        const val TYPE_TEXT = 100
+        const val TYPE_DRAWABLE = 101
+    }
+
+    private val paint: TextPaint = TextPaint(Paint.ANTI_ALIAS_FLAG)
+    private var bitmapScaling: Float = 1f
+    private var cutout: Bitmap? = null
+    var foregroundColor = Color.MAGENTA
+    var text: String? = "Text"
+        set(value) {
+            field = value
+            if (value != null) cutoutType = TYPE_TEXT
+            else if (drawable != null) cutoutType = TYPE_DRAWABLE
+        }
+    var cutoutType: Int = TYPE_TEXT
+    private var textSize: Float = 0f
+    private var cutoutY: Float = 0f
+    private var cutoutX: Float = 0f
+    var drawable: Drawable? = null
+        set(value) {
+            field = value
+            if (value != null) cutoutType = TYPE_DRAWABLE
+            else if (text != null) cutoutType = TYPE_TEXT
+        }
+    private var heightPercentage: Float = 0f
+    private var minHeight: Float = 0f
+    private val maxTextSize: Float
+
+    init {
+        if (attrs != null) {
+            val a = context.obtainStyledAttributes(attrs, R.styleable.CutoutView, 0, 0)
+            if (a.hasValue(R.styleable.CutoutView_font))
+                paint.typeface = context.getFont(a.getString(R.styleable.CutoutView_font))
+            foregroundColor = a.getColor(R.styleable.CutoutView_foregroundColor, foregroundColor)
+            text = a.getString(R.styleable.CutoutView_android_text) ?: text
+            minHeight = a.getDimension(R.styleable.CutoutView_android_minHeight, minHeight)
+            heightPercentage = a.getFloat(R.styleable.CutoutView_heightPercentageToScreen, heightPercentage)
+            a.recycle()
+        }
+        maxTextSize = context.dimenPixelSize(R.dimen.kau_display_4_text_size).toFloat()
+    }
+
+    override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
+        super.onSizeChanged(w, h, oldw, oldh)
+        calculatePosition()
+        createBitmap()
+    }
+
+    private fun calculatePosition() {
+        when (cutoutType) {
+            TYPE_TEXT -> calculateTextPosition()
+            TYPE_DRAWABLE -> calculateImagePosition()
+        }
+    }
+
+    private fun calculateTextPosition() {
+        val targetWidth = width / PHI
+        textSize = getSingleLineTextSize(text!!, paint, targetWidth, 0f, maxTextSize,
+                0.5f, resources.displayMetrics)
+        paint.textSize = textSize
+
+        // measuring text is fun :] see: https://chris.banes.me/2014/03/27/measuring-text/
+        cutoutX = (width - paint.measureText(text)) / 2
+        val textBounds = Rect()
+        paint.getTextBounds(text, 0, text!!.length, textBounds)
+        val textHeight = textBounds.height().toFloat()
+        cutoutY = (height + textHeight) / 2
+    }
+
+    private fun calculateImagePosition() {
+        if (drawable!!.intrinsicHeight <= 0 || drawable!!.intrinsicWidth <= 0) throw IllegalArgumentException("Drawable's intrinsic size cannot be less than 0")
+        val targetWidth = width / PHI
+        val targetHeight = height / PHI
+        bitmapScaling = Math.min(targetHeight / drawable!!.intrinsicHeight, targetWidth / drawable!!.intrinsicWidth)
+        cutoutX = (width - drawable!!.intrinsicWidth * bitmapScaling) / 2
+        cutoutY = (height - drawable!!.intrinsicHeight * bitmapScaling) / 2
+    }
+
+    /**
+     * If height percent is specified, ensure it is met
+     */
+    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
+        val minHeight = Math.max(minHeight, heightPercentage * parentVisibleHeight)
+        val trueHeightMeasureSpec = if (minHeight > 0)
+            MeasureSpec.makeMeasureSpec(Math.max(minHeight.toInt(), measuredHeight), MeasureSpec.EXACTLY)
+        else heightMeasureSpec
+        super.onMeasure(widthMeasureSpec, trueHeightMeasureSpec)
+    }
+
+    /**
+     * Recursive binary search to find the best size for the text.
+
+     * Adapted from https://github.com/grantland/android-autofittextview
+     */
+    fun getSingleLineTextSize(text: String,
+                              paint: TextPaint,
+                              targetWidth: Float,
+                              low: Float,
+                              high: Float,
+                              precision: Float,
+                              metrics: DisplayMetrics): Float {
+        val mid = (low + high) / 2.0f
+
+        paint.textSize = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, mid, metrics)
+        val maxLineWidth = paint.measureText(text)
+
+        return if (high - low < precision) low
+        else if (maxLineWidth > targetWidth) getSingleLineTextSize(text, paint, targetWidth, low, mid, precision, metrics)
+        else if (maxLineWidth < targetWidth) getSingleLineTextSize(text, paint, targetWidth, mid, high, precision, metrics)
+        else mid
+    }
+
+    private fun createBitmap() {
+        if (!(cutout?.isRecycled ?: true))
+            cutout?.recycle()
+        if (width == 0 || height == 0) return
+        cutout = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888)
+        cutout!!.setHasAlpha(true)
+        val cutoutCanvas = Canvas(cutout!!)
+        cutoutCanvas.drawColor(foregroundColor)
+        paint.xfermode = PorterDuffXfermode(PorterDuff.Mode.CLEAR)
+
+        when (cutoutType) {
+            TYPE_TEXT -> {
+                // this is the magic – Clear mode punches out the bitmap
+                paint.xfermode = PorterDuffXfermode(PorterDuff.Mode.CLEAR)
+                cutoutCanvas.drawText(text, cutoutX, cutoutY, paint)
+            }
+            TYPE_DRAWABLE -> {
+                cutoutCanvas.drawBitmap(drawable!!.toBitmap(bitmapScaling, Bitmap.Config.ALPHA_8), cutoutX, cutoutY, paint)
+            }
+
+        }
+    }
+
+    override fun onDraw(canvas: Canvas) {
+        canvas.drawBitmap(cutout!!, 0f, 0f, null)
+    }
+
+    override fun hasOverlappingRendering(): Boolean = true
+
+}
diff --git a/core/src/main/kotlin/ca/allanwang/kau/views/RippleCanvas.kt b/core/src/main/kotlin/ca/allanwang/kau/views/RippleCanvas.kt
new file mode 100644
index 0000000..805fb21
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/views/RippleCanvas.kt
@@ -0,0 +1,140 @@
+package ca.allanwang.kau.views
+
+import android.animation.ArgbEvaluator
+import android.animation.ValueAnimator
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.Color
+import android.graphics.Paint
+import android.util.AttributeSet
+import android.view.View
+import ca.allanwang.kau.utils.adjustAlpha
+
+/**
+ * Created by Allan Wang on 2016-11-17.
+ *
+ *
+ * Canvas drawn ripples that keep the previous color
+ * Extends to view dimensions
+ * Supports multiple ripples from varying locations
+ */
+class RippleCanvas @JvmOverloads constructor(
+        context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
+) : View(context, attrs, defStyleAttr) {
+    private val paint: Paint = Paint()
+    private var baseColor = Color.TRANSPARENT
+    private val ripples: MutableList<Ripple> = mutableListOf()
+
+    init {
+        paint.isAntiAlias = true
+        paint.style = Paint.Style.FILL
+    }
+
+    /**
+     * Drawing the ripples involves having access to the next layer if it exists,
+     * and using its values to decide on the current color.
+     * If the next layer requests a fade, we will adjust the alpha of our current layer before drawing.
+     * Otherwise we will just draw the color as intended
+     */
+    override fun onDraw(canvas: Canvas) {
+        val itr = ripples.listIterator()
+        if (!itr.hasNext()) return canvas.drawColor(baseColor)
+        var next = itr.next()
+        canvas.drawColor(colorToDraw(baseColor, next.fade, next.radius, next.maxRadius))
+        var last = false
+        while (!last) {
+            val current = next
+            if (itr.hasNext()) next = itr.next()
+            else last = true
+            //We may fade any layer except for the last one
+            paint.color = colorToDraw(current.color, next.fade && !last, next.radius, next.maxRadius)
+            canvas.drawCircle(current.x, current.y, current.radius, paint)
+            if (current.radius == current.maxRadius) {
+                if (!last) {
+                    itr.previous()
+                    itr.remove()
+                    itr.next()
+                } else {
+                    itr.remove()
+                }
+                baseColor = current.color
+            }
+        }
+    }
+
+    /**
+     * Given our current color and next layer's radius & max,
+     * we will decide on the alpha of our current layer
+     */
+    internal fun colorToDraw(color: Int, fade: Boolean, current: Float, goal: Float): Int {
+        if (!fade || (current / goal <= FADE_PIVOT)) return color
+        val factor = (goal - current) / (goal - FADE_PIVOT * goal)
+        return color.adjustAlpha(factor)
+    }
+
+    /**
+     * Creates a ripple effect from the given starting values
+     * [fade] will gradually transition previous ripples to a transparent color so the resulting background is what we want
+     * this is typically only necessary if the ripple color has transparency
+     */
+    fun ripple(color: Int, startX: Float = 0f, startY: Float = 0f, duration: Long = 600L, fade: Boolean = Color.alpha(color) != 255) {
+        val w = width.toFloat()
+        val h = height.toFloat()
+        val x = when (startX) {
+            MIDDLE -> w / 2
+            END -> w
+            else -> startX
+        }
+        val y = when (startY) {
+            MIDDLE -> h / 2
+            END -> h
+            else -> startY
+        }
+        val maxRadius = Math.hypot(Math.max(x, w - x).toDouble(), Math.max(y, h - y).toDouble()).toFloat()
+        val ripple = Ripple(color, x, y, 0f, maxRadius, fade)
+        ripples.add(ripple)
+        val animator = ValueAnimator.ofFloat(0f, maxRadius)
+        animator.duration = duration
+        animator.addUpdateListener { animation ->
+            ripple.radius = animation.animatedValue as Float
+            invalidate()
+        }
+        animator.start()
+    }
+
+    /**
+     * Sets a color directly; clears ripple queue if it exists
+     */
+    fun set(color: Int) {
+        baseColor = color
+        ripples.clear()
+        invalidate()
+    }
+
+    /**
+     * Sets a color directly but with a transition
+     */
+    fun fade(color: Int, duration: Long = 300L) {
+        ripples.clear()
+        val animator = ValueAnimator.ofObject(ArgbEvaluator(), baseColor, color)
+        animator.duration = duration
+        animator.addUpdateListener { animation ->
+            baseColor = animation.animatedValue as Int
+            invalidate()
+        }
+        animator.start()
+    }
+
+    internal class Ripple(val color: Int,
+                          val x: Float,
+                          val y: Float,
+                          var radius: Float,
+                          val maxRadius: Float,
+                          val fade: Boolean)
+
+    companion object {
+        const val MIDDLE = -1.0f
+        const val END = -2.0f
+        const val FADE_PIVOT = 0.5f
+    }
+}
diff --git a/core/src/main/kotlin/ca/allanwang/kau/views/SimpleRippleDrawable.kt b/core/src/main/kotlin/ca/allanwang/kau/views/SimpleRippleDrawable.kt
new file mode 100644
index 0000000..df842f6
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/views/SimpleRippleDrawable.kt
@@ -0,0 +1,19 @@
+package ca.allanwang.kau.views
+
+import android.content.res.ColorStateList
+import android.graphics.drawable.ColorDrawable
+import android.graphics.drawable.RippleDrawable
+import android.support.annotation.ColorInt
+import ca.allanwang.kau.utils.adjustAlpha
+
+/**
+ * Created by Allan Wang on 2017-06-24.
+ *
+ * Tries to mimic a standard ripple, given the foreground and background colors
+ */
+fun createSimpleRippleDrawable(@ColorInt foregroundColor: Int, @ColorInt backgroundColor: Int): RippleDrawable {
+    val states = ColorStateList(arrayOf(intArrayOf()), intArrayOf(foregroundColor))
+    val content = ColorDrawable(backgroundColor)
+    val mask = ColorDrawable(foregroundColor.adjustAlpha(0.16f))
+    return RippleDrawable(states, content, mask)
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/widgets/ElasticDragDismissFrameLayout.kt b/core/src/main/kotlin/ca/allanwang/kau/widgets/ElasticDragDismissFrameLayout.kt
new file mode 100644
index 0000000..38c99c3
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/widgets/ElasticDragDismissFrameLayout.kt
@@ -0,0 +1,234 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ca.allanwang.kau.widgets
+
+import android.app.Activity
+import android.content.Context
+import android.graphics.Color
+import android.util.AttributeSet
+import android.view.View
+import android.widget.FrameLayout
+import ca.allanwang.kau.R
+import ca.allanwang.kau.utils.*
+
+/**
+ * A [FrameLayout] which responds to nested scrolls to create drag-dismissable layouts.
+ * Applies an elasticity factor to reduce movement as you approach the given dismiss distance.
+ * Optionally also scales down content during drag.
+ */
+class ElasticDragDismissFrameLayout @JvmOverloads constructor(
+        context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0, defStyleRes: Int = 0
+) : FrameLayout(context, attrs, defStyleAttr, defStyleRes) {
+
+    // configurable attribs
+    private var dragDismissDistance = Float.MAX_VALUE
+    private var dragDismissFraction = -1f
+    private var dragDismissScale = 1f
+    private var shouldScale = false
+    private var dragElacticity = 0.8f
+
+    // state
+    private var totalDrag: Float = 0f
+    private var draggingDown = false
+    private var draggingUp = false
+
+    private var callbacks: MutableList<ElasticDragDismissCallback> = mutableListOf()
+
+    init {
+        if (attrs != null) {
+            val a = getContext().obtainStyledAttributes(attrs, R.styleable.ElasticDragDismissFrameLayout, 0, 0)
+            dragDismissDistance = a.getDimensionPixelSize(R.styleable.ElasticDragDismissFrameLayout_dragDismissDistance, Int.MAX_VALUE).toFloat()
+            dragDismissFraction = a.getFloat(R.styleable.ElasticDragDismissFrameLayout_dragDismissFraction, dragDismissFraction)
+            dragDismissScale = a.getFloat(R.styleable.ElasticDragDismissFrameLayout_dragDismissScale, dragDismissScale)
+            shouldScale = dragDismissScale != 1f
+            dragElacticity = a.getFloat(R.styleable.ElasticDragDismissFrameLayout_dragElasticity, dragElacticity)
+            a.recycle()
+        }
+    }
+
+    abstract class ElasticDragDismissCallback {
+
+        /**
+         * Called for each drag event.
+
+         * @param elasticOffset       Indicating the drag offset with elasticity applied i.e. may
+         * *                            exceed 1.
+         * *
+         * @param elasticOffsetPixels The elastically scaled drag distance in pixels.
+         * *
+         * @param rawOffset           Value from [0, 1] indicating the raw drag offset i.e.
+         * *                            without elasticity applied. A value of 1 indicates that the
+         * *                            dismiss distance has been reached.
+         * *
+         * @param rawOffsetPixels     The raw distance the user has dragged
+         */
+        internal open fun onDrag(elasticOffset: Float, elasticOffsetPixels: Float,
+                                 rawOffset: Float, rawOffsetPixels: Float) {
+        }
+
+        /**
+         * Called when dragging is released and has exceeded the threshold dismiss distance.
+         */
+        internal open fun onDragDismissed() {}
+
+    }
+
+    override fun onStartNestedScroll(child: View, target: View, nestedScrollAxes: Int): Boolean {
+        return nestedScrollAxes and View.SCROLL_AXIS_VERTICAL != 0
+    }
+
+    override fun onNestedPreScroll(target: View, dx: Int, dy: Int, consumed: IntArray) {
+        // if we're in a drag gesture and the user reverses up the we should take those events
+        if (draggingDown && dy > 0 || draggingUp && dy < 0) {
+            dragScale(dy)
+            consumed[1] = dy
+        }
+    }
+
+    override fun onNestedScroll(target: View, dxConsumed: Int, dyConsumed: Int,
+                                dxUnconsumed: Int, dyUnconsumed: Int) {
+        dragScale(dyUnconsumed)
+    }
+
+    override fun onStopNestedScroll(child: View) {
+        if (Math.abs(totalDrag) >= dragDismissDistance) {
+            dispatchDismissCallback()
+        } else { // settle back to natural position
+            animate()
+                    .translationY(0f)
+                    .scaleX(1f)
+                    .scaleY(1f)
+                    .setDuration(200L)
+                    .setInterpolator(AnimHolder.fastOutSlowInInterpolator(context))
+                    .setListener(null)
+                    .start()
+            totalDrag = 0f
+            draggingUp = false
+            draggingDown = draggingUp
+            dispatchDragCallback(0f, 0f, 0f, 0f)
+        }
+    }
+
+    override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
+        super.onSizeChanged(w, h, oldw, oldh)
+        if (dragDismissFraction > 0f) {
+            dragDismissDistance = h * dragDismissFraction
+        }
+    }
+
+    fun addListener(listener: ElasticDragDismissCallback) {
+        callbacks.add(listener)
+    }
+
+    fun removeListener(listener: ElasticDragDismissCallback) {
+        callbacks.remove(listener)
+    }
+
+    private fun dragScale(scroll: Int) {
+        if (scroll == 0) return
+
+        totalDrag += scroll.toFloat()
+
+        // track the direction & set the pivot point for scaling
+        // don't double track i.e. if start dragging down and then reverse, keep tracking as
+        // dragging down until they reach the 'natural' position
+        if (scroll < 0 && !draggingUp && !draggingDown) {
+            draggingDown = true
+            if (shouldScale) pivotY = height.toFloat()
+        } else if (scroll > 0 && !draggingDown && !draggingUp) {
+            draggingUp = true
+            if (shouldScale) pivotY = 0f
+        }
+        // how far have we dragged relative to the distance to perform a dismiss
+        // (0–1 where 1 = dismiss distance). Decreasing logarithmically as we approach the limit
+        var dragFraction = Math.log10((1 + Math.abs(totalDrag) / dragDismissDistance).toDouble()).toFloat()
+
+        // calculate the desired translation given the drag fraction
+        var dragTo = dragFraction * dragDismissDistance * dragElacticity
+
+        if (draggingUp) {
+            // as we use the absolute magnitude when calculating the drag fraction, need to
+            // re-apply the drag direction
+            dragTo *= -1f
+        }
+        translationY = dragTo
+
+        if (shouldScale) {
+            val scale = 1 - (1 - dragDismissScale) * dragFraction
+            scaleX = scale
+            scaleY = scale
+        }
+
+        // if we've reversed direction and gone past the settle point then clear the flags to
+        // allow the list to get the scroll events & reset any transforms
+        if (draggingDown && totalDrag >= 0 || draggingUp && totalDrag <= 0) {
+            dragFraction = 0f
+            dragTo = dragFraction
+            totalDrag = dragTo
+            draggingUp = false
+            draggingDown = draggingUp
+            translationY = 0f
+            scaleX = 1f
+            scaleY = 1f
+        }
+        dispatchDragCallback(dragFraction, dragTo,
+                Math.min(1f, Math.abs(totalDrag) / dragDismissDistance), totalDrag)
+    }
+
+    private fun dispatchDragCallback(elasticOffset: Float, elasticOffsetPixels: Float,
+                                     rawOffset: Float, rawOffsetPixels: Float) {
+        callbacks.forEach {
+            it.onDrag(elasticOffset, elasticOffsetPixels,
+                    rawOffset, rawOffsetPixels)
+        }
+    }
+
+    private fun dispatchDismissCallback() {
+        callbacks.forEach { it.onDragDismissed() }
+    }
+
+    /**
+     * An [ElasticDragDismissCallback] which fades system chrome (i.e. status bar and
+     * navigation bar) whilst elastic drags are performed and
+     * [finishes][Activity.finishAfterTransition] the activity when drag dismissed.
+     */
+    open class SystemChromeFader(private val activity: Activity) : ElasticDragDismissCallback() {
+        private val statusBarAlpha: Int = Color.alpha(activity.statusBarColor)
+        private val navBarAlpha: Int = Color.alpha(activity.navigationBarColor)
+        private val fadeNavBar: Boolean = activity.isNavBarOnBottom
+
+        public override fun onDrag(elasticOffset: Float, elasticOffsetPixels: Float,
+                                   rawOffset: Float, rawOffsetPixels: Float) {
+            if (elasticOffsetPixels > 0) {
+                // dragging downward, fade the status bar in proportion
+                activity.statusBarColor = activity.statusBarColor.withAlpha(((1f - rawOffset) * statusBarAlpha).toInt())
+            } else if (elasticOffsetPixels == 0f) {
+                // reset
+                activity.statusBarColor = activity.statusBarColor.withAlpha(statusBarAlpha)
+                activity.navigationBarColor = activity.navigationBarColor.withAlpha(navBarAlpha)
+            } else if (fadeNavBar) {
+                // dragging upward, fade the navigation bar in proportion
+                activity.navigationBarColor = activity.navigationBarColor.withAlpha(((1f - rawOffset) * navBarAlpha).toInt())
+            }
+        }
+
+        public override fun onDragDismissed() {
+            activity.finishAfterTransition()
+        }
+    }
+
+}
diff --git a/core/src/main/kotlin/ca/allanwang/kau/widgets/InkPageIndicator.java b/core/src/main/kotlin/ca/allanwang/kau/widgets/InkPageIndicator.java
new file mode 100644
index 0000000..78e915d
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/widgets/InkPageIndicator.java
@@ -0,0 +1,859 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ca.allanwang.kau.widgets;
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.AnimatorSet;
+import android.animation.ValueAnimator;
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.database.DataSetObserver;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.RectF;
+import android.support.annotation.ColorInt;
+import android.support.v4.view.ViewPager;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.View;
+import android.view.animation.Interpolator;
+
+import java.util.Arrays;
+
+import ca.allanwang.kau.R;
+import ca.allanwang.kau.utils.AnimHolder;
+import ca.allanwang.kau.utils.ColorUtilsKt;
+
+/**
+ * An ink inspired widget for indicating pages in a {@link ViewPager}.
+ */
+public class InkPageIndicator extends View implements ViewPager.OnPageChangeListener,
+        View.OnAttachStateChangeListener {
+
+    // defaults
+    private static final int DEFAULT_DOT_SIZE = 8;                      // dp
+    private static final int DEFAULT_GAP = 12;                          // dp
+    private static final int DEFAULT_ANIM_DURATION = 400;               // ms
+    private static final int DEFAULT_UNSELECTED_COLOUR = 0x80ffffff;    // 50% white
+    private static final int DEFAULT_SELECTED_COLOUR = 0xffffffff;      // 100% white
+
+    // constants
+    private static final float INVALID_FRACTION = -1f;
+    private static final float MINIMAL_REVEAL = 0.00001f;
+
+    // configurable attributes
+    private int dotDiameter;
+    private int gap;
+    private long animDuration;
+    private int unselectedColour;
+    private int selectedColour;
+
+    public void setColour(@ColorInt int color) {
+        selectedColour = color;
+        unselectedColour = ColorUtilsKt.adjustAlpha(color, 0.5f);
+        selectedPaint.setColor(selectedColour);
+        unselectedPaint.setColor(unselectedColour);
+    }
+
+    // derived from attributes
+    private float dotRadius;
+    private float halfDotRadius;
+    private long animHalfDuration;
+    private float dotTopY;
+    private float dotCenterY;
+    private float dotBottomY;
+
+    // ViewPager
+    private ViewPager viewPager;
+
+    // state
+    private int pageCount;
+    private int currentPage;
+    private int previousPage;
+    private float selectedDotX;
+    private boolean selectedDotInPosition;
+    private float[] dotCenterX;
+    private float[] joiningFractions;
+    private float retreatingJoinX1;
+    private float retreatingJoinX2;
+    private float[] dotRevealFractions;
+    private boolean isAttachedToWindow;
+    private boolean pageChanging;
+
+    // drawing
+    private final Paint unselectedPaint;
+    private final Paint selectedPaint;
+    private final Path combinedUnselectedPath;
+    private final Path unselectedDotPath;
+    private final Path unselectedDotLeftPath;
+    private final Path unselectedDotRightPath;
+    private final RectF rectF;
+
+    // animation
+    private ValueAnimator moveAnimation;
+    private AnimatorSet joiningAnimationSet;
+    private PendingRetreatAnimator retreatAnimation;
+    private PendingRevealAnimator[] revealAnimations;
+    private final Interpolator interpolator;
+
+    // working values for beziers
+    float endX1;
+    float endY1;
+    float endX2;
+    float endY2;
+    float controlX1;
+    float controlY1;
+    float controlX2;
+    float controlY2;
+
+    public InkPageIndicator(Context context) {
+        this(context, null, 0);
+    }
+
+    public InkPageIndicator(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public InkPageIndicator(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+
+        final int density = (int) context.getResources().getDisplayMetrics().density;
+
+        // Load attributes
+        final TypedArray a = getContext().obtainStyledAttributes(
+                attrs, R.styleable.InkPageIndicator, defStyle, 0);
+
+        dotDiameter = a.getDimensionPixelSize(R.styleable.InkPageIndicator_dotDiameter,
+                DEFAULT_DOT_SIZE * density);
+        dotRadius = dotDiameter / 2;
+        halfDotRadius = dotRadius / 2;
+        gap = a.getDimensionPixelSize(R.styleable.InkPageIndicator_dotGap,
+                DEFAULT_GAP * density);
+        animDuration = (long) a.getInteger(R.styleable.InkPageIndicator_animationDuration,
+                DEFAULT_ANIM_DURATION);
+        animHalfDuration = animDuration / 2;
+        unselectedColour = a.getColor(R.styleable.InkPageIndicator_pageIndicatorColor,
+                DEFAULT_UNSELECTED_COLOUR);
+        selectedColour = a.getColor(R.styleable.InkPageIndicator_currentPageIndicatorColor,
+                DEFAULT_SELECTED_COLOUR);
+
+        a.recycle();
+
+        unselectedPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
+        unselectedPaint.setColor(unselectedColour);
+        selectedPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
+        selectedPaint.setColor(selectedColour);
+        interpolator = AnimHolder.INSTANCE.getFastOutSlowInInterpolator().invoke(context);
+
+        // create paths & rect now – reuse & rewind later
+        combinedUnselectedPath = new Path();
+        unselectedDotPath = new Path();
+        unselectedDotLeftPath = new Path();
+        unselectedDotRightPath = new Path();
+        rectF = new RectF();
+
+        addOnAttachStateChangeListener(this);
+    }
+
+    public void setViewPager(ViewPager viewPager) {
+        this.viewPager = viewPager;
+        viewPager.addOnPageChangeListener(this);
+        setPageCount(viewPager.getAdapter().getCount());
+        viewPager.getAdapter().registerDataSetObserver(new DataSetObserver() {
+            @Override
+            public void onChanged() {
+                setPageCount(InkPageIndicator.this.viewPager.getAdapter().getCount());
+            }
+        });
+        setCurrentPageImmediate();
+    }
+
+    @Override
+    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+        if (isAttachedToWindow) {
+            float fraction = positionOffset;
+            int currentPosition = pageChanging ? previousPage : currentPage;
+            int leftDotPosition = position;
+            // when swiping from #2 to #1 ViewPager reports position as 1 and a descending offset
+            // need to convert this into our left-dot-based 'coordinate space'
+            if (currentPosition != position) {
+                fraction = 1f - positionOffset;
+
+                // if user scrolls completely to next page then the position param updates to that
+                // new page but we're not ready to switch our 'current' page yet so adjust for that
+                if (fraction == 1f) {
+                    leftDotPosition = Math.min(currentPosition, position);
+                }
+            }
+            setJoiningFraction(leftDotPosition, fraction);
+        }
+    }
+
+    @Override
+    public void onPageSelected(int position) {
+        if (isAttachedToWindow) {
+            // this is the main event we're interested in!
+            setSelectedPage(position);
+        } else {
+            // when not attached, don't animate the move, just store immediately
+            setCurrentPageImmediate();
+        }
+    }
+
+    @Override
+    public void onPageScrollStateChanged(int state) {
+        // nothing to do
+    }
+
+    private void setPageCount(int pages) {
+        pageCount = pages;
+        resetState();
+        requestLayout();
+    }
+
+    private void calculateDotPositions(int width, int height) {
+        int left = getPaddingLeft();
+        int top = getPaddingTop();
+        int right = width - getPaddingRight();
+        int bottom = height - getPaddingBottom();
+
+        int requiredWidth = getRequiredWidth();
+        float startLeft = left + ((right - left - requiredWidth) / 2) + dotRadius;
+
+        dotCenterX = new float[pageCount];
+        for (int i = 0; i < pageCount; i++) {
+            dotCenterX[i] = startLeft + i * (dotDiameter + gap);
+        }
+        // todo just top aligning for now… should make this smarter
+        dotTopY = top;
+        dotCenterY = top + dotRadius;
+        dotBottomY = top + dotDiameter;
+
+        setCurrentPageImmediate();
+    }
+
+    private void setCurrentPageImmediate() {
+        if (viewPager != null) {
+            currentPage = viewPager.getCurrentItem();
+        } else {
+            currentPage = 0;
+        }
+        if (dotCenterX != null) {
+            selectedDotX = dotCenterX[currentPage];
+        }
+    }
+
+    private void resetState() {
+        joiningFractions = new float[pageCount - 1];
+        Arrays.fill(joiningFractions, 0f);
+        dotRevealFractions = new float[pageCount];
+        Arrays.fill(dotRevealFractions, 0f);
+        retreatingJoinX1 = INVALID_FRACTION;
+        retreatingJoinX2 = INVALID_FRACTION;
+        selectedDotInPosition = true;
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+
+        int desiredHeight = getDesiredHeight();
+        int height;
+        switch (MeasureSpec.getMode(heightMeasureSpec)) {
+            case MeasureSpec.EXACTLY:
+                height = MeasureSpec.getSize(heightMeasureSpec);
+                break;
+            case MeasureSpec.AT_MOST:
+                height = Math.min(desiredHeight, MeasureSpec.getSize(heightMeasureSpec));
+                break;
+            case MeasureSpec.UNSPECIFIED:
+            default:
+                height = desiredHeight;
+                break;
+        }
+
+        int desiredWidth = getDesiredWidth();
+        int width;
+        switch (MeasureSpec.getMode(widthMeasureSpec)) {
+            case MeasureSpec.EXACTLY:
+                width = MeasureSpec.getSize(widthMeasureSpec);
+                break;
+            case MeasureSpec.AT_MOST:
+                width = Math.min(desiredWidth, MeasureSpec.getSize(widthMeasureSpec));
+                break;
+            case MeasureSpec.UNSPECIFIED:
+            default:
+                width = desiredWidth;
+                break;
+        }
+        setMeasuredDimension(width, height);
+        calculateDotPositions(width, height);
+    }
+
+    private int getDesiredHeight() {
+        return getPaddingTop() + dotDiameter + getPaddingBottom();
+    }
+
+    private int getRequiredWidth() {
+        return pageCount * dotDiameter + (pageCount - 1) * gap;
+    }
+
+    private int getDesiredWidth() {
+        return getPaddingLeft() + getRequiredWidth() + getPaddingRight();
+    }
+
+    @Override
+    public void onViewAttachedToWindow(View view) {
+        isAttachedToWindow = true;
+    }
+
+    @Override
+    public void onViewDetachedFromWindow(View view) {
+        isAttachedToWindow = false;
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        if (viewPager == null || pageCount == 0) return;
+        drawUnselected(canvas);
+        drawSelected(canvas);
+    }
+
+    private void drawUnselected(Canvas canvas) {
+
+        combinedUnselectedPath.rewind();
+
+        // draw any settled, revealing or joining dots
+        for (int page = 0; page < pageCount; page++) {
+            int nextXIndex = page == pageCount - 1 ? page : page + 1;
+            combinedUnselectedPath.op(getUnselectedPath(page,
+                    dotCenterX[page],
+                    dotCenterX[nextXIndex],
+                    page == pageCount - 1 ? INVALID_FRACTION : joiningFractions[page],
+                    dotRevealFractions[page]), Path.Op.UNION);
+        }
+        // draw any retreating joins
+        if (retreatingJoinX1 != INVALID_FRACTION) {
+            combinedUnselectedPath.op(getRetreatingJoinPath(), Path.Op.UNION);
+        }
+        canvas.drawPath(combinedUnselectedPath, unselectedPaint);
+    }
+
+    /**
+     * Unselected dots can be in 6 states:
+     * <p>
+     * #1 At rest
+     * #2 Joining neighbour, still separate
+     * #3 Joining neighbour, combined curved
+     * #4 Joining neighbour, combined straight
+     * #5 Join retreating
+     * #6 Dot re-showing / revealing
+     * <p>
+     * It can also be in a combination of these states e.g. joining one neighbour while
+     * retreating from another.  We therefore create a Path so that we can examine each
+     * dot pair separately and later take the union for these cases.
+     * <p>
+     * This function returns a path for the given dot **and any action to it's right** e.g. joining
+     * or retreating from it's neighbour
+     *
+     * @param page
+     * @return
+     */
+    private Path getUnselectedPath(int page,
+                                   float centerX,
+                                   float nextCenterX,
+                                   float joiningFraction,
+                                   float dotRevealFraction) {
+
+        unselectedDotPath.rewind();
+
+        if ((joiningFraction == 0f || joiningFraction == INVALID_FRACTION)
+                && dotRevealFraction == 0f
+                && !(page == currentPage && selectedDotInPosition == true)) {
+
+            // case #1 – At rest
+            unselectedDotPath.addCircle(dotCenterX[page], dotCenterY, dotRadius, Path.Direction.CW);
+        }
+
+        if (joiningFraction > 0f && joiningFraction <= 0.5f
+                && retreatingJoinX1 == INVALID_FRACTION) {
+
+            // case #2 – Joining neighbour, still separate
+
+            // start with the left dot
+            unselectedDotLeftPath.rewind();
+
+            // start at the bottom center
+            unselectedDotLeftPath.moveTo(centerX, dotBottomY);
+
+            // semi circle to the top center
+            rectF.set(centerX - dotRadius, dotTopY, centerX + dotRadius, dotBottomY);
+            unselectedDotLeftPath.arcTo(rectF, 90, 180, true);
+
+            // cubic to the right middle
+            endX1 = centerX + dotRadius + (joiningFraction * gap);
+            endY1 = dotCenterY;
+            controlX1 = centerX + halfDotRadius;
+            controlY1 = dotTopY;
+            controlX2 = endX1;
+            controlY2 = endY1 - halfDotRadius;
+            unselectedDotLeftPath.cubicTo(controlX1, controlY1,
+                    controlX2, controlY2,
+                    endX1, endY1);
+
+            // cubic back to the bottom center
+            endX2 = centerX;
+            endY2 = dotBottomY;
+            controlX1 = endX1;
+            controlY1 = endY1 + halfDotRadius;
+            controlX2 = centerX + halfDotRadius;
+            controlY2 = dotBottomY;
+            unselectedDotLeftPath.cubicTo(controlX1, controlY1,
+                    controlX2, controlY2,
+                    endX2, endY2);
+
+            unselectedDotPath.op(unselectedDotLeftPath, Path.Op.UNION);
+
+            // now do the next dot to the right
+            unselectedDotRightPath.rewind();
+
+            // start at the bottom center
+            unselectedDotRightPath.moveTo(nextCenterX, dotBottomY);
+
+            // semi circle to the top center
+            rectF.set(nextCenterX - dotRadius, dotTopY, nextCenterX + dotRadius, dotBottomY);
+            unselectedDotRightPath.arcTo(rectF, 90, -180, true);
+
+            // cubic to the left middle
+            endX1 = nextCenterX - dotRadius - (joiningFraction * gap);
+            endY1 = dotCenterY;
+            controlX1 = nextCenterX - halfDotRadius;
+            controlY1 = dotTopY;
+            controlX2 = endX1;
+            controlY2 = endY1 - halfDotRadius;
+            unselectedDotRightPath.cubicTo(controlX1, controlY1,
+                    controlX2, controlY2,
+                    endX1, endY1);
+
+            // cubic back to the bottom center
+            endX2 = nextCenterX;
+            endY2 = dotBottomY;
+            controlX1 = endX1;
+            controlY1 = endY1 + halfDotRadius;
+            controlX2 = endX2 - halfDotRadius;
+            controlY2 = dotBottomY;
+            unselectedDotRightPath.cubicTo(controlX1, controlY1,
+                    controlX2, controlY2,
+                    endX2, endY2);
+            unselectedDotPath.op(unselectedDotRightPath, Path.Op.UNION);
+        }
+
+        if (joiningFraction > 0.5f && joiningFraction < 1f
+                && retreatingJoinX1 == INVALID_FRACTION) {
+
+            // case #3 – Joining neighbour, combined curved
+
+            // adjust the fraction so that it goes from 0.3 -> 1 to produce a more realistic 'join'
+            float adjustedFraction = (joiningFraction - 0.2f) * 1.25f;
+
+            // start in the bottom left
+            unselectedDotPath.moveTo(centerX, dotBottomY);
+
+            // semi-circle to the top left
+            rectF.set(centerX - dotRadius, dotTopY, centerX + dotRadius, dotBottomY);
+            unselectedDotPath.arcTo(rectF, 90, 180, true);
+
+            // bezier to the middle top of the join
+            endX1 = centerX + dotRadius + (gap / 2);
+            endY1 = dotCenterY - (adjustedFraction * dotRadius);
+            controlX1 = endX1 - (adjustedFraction * dotRadius);
+            controlY1 = dotTopY;
+            controlX2 = endX1 - ((1 - adjustedFraction) * dotRadius);
+            controlY2 = endY1;
+            unselectedDotPath.cubicTo(controlX1, controlY1,
+                    controlX2, controlY2,
+                    endX1, endY1);
+
+            // bezier to the top right of the join
+            endX2 = nextCenterX;
+            endY2 = dotTopY;
+            controlX1 = endX1 + ((1 - adjustedFraction) * dotRadius);
+            controlY1 = endY1;
+            controlX2 = endX1 + (adjustedFraction * dotRadius);
+            controlY2 = dotTopY;
+            unselectedDotPath.cubicTo(controlX1, controlY1,
+                    controlX2, controlY2,
+                    endX2, endY2);
+
+            // semi-circle to the bottom right
+            rectF.set(nextCenterX - dotRadius, dotTopY, nextCenterX + dotRadius, dotBottomY);
+            unselectedDotPath.arcTo(rectF, 270, 180, true);
+
+            // bezier to the middle bottom of the join
+            // endX1 stays the same
+            endY1 = dotCenterY + (adjustedFraction * dotRadius);
+            controlX1 = endX1 + (adjustedFraction * dotRadius);
+            controlY1 = dotBottomY;
+            controlX2 = endX1 + ((1 - adjustedFraction) * dotRadius);
+            controlY2 = endY1;
+            unselectedDotPath.cubicTo(controlX1, controlY1,
+                    controlX2, controlY2,
+                    endX1, endY1);
+
+            // bezier back to the start point in the bottom left
+            endX2 = centerX;
+            endY2 = dotBottomY;
+            controlX1 = endX1 - ((1 - adjustedFraction) * dotRadius);
+            controlY1 = endY1;
+            controlX2 = endX1 - (adjustedFraction * dotRadius);
+            controlY2 = endY2;
+            unselectedDotPath.cubicTo(controlX1, controlY1,
+                    controlX2, controlY2,
+                    endX2, endY2);
+        }
+        if (joiningFraction == 1 && retreatingJoinX1 == INVALID_FRACTION) {
+
+            // case #4 Joining neighbour, combined straight technically we could use case 3 for this
+            // situation as well but assume that this is an optimization rather than faffing around
+            // with beziers just to draw a rounded rect
+            rectF.set(centerX - dotRadius, dotTopY, nextCenterX + dotRadius, dotBottomY);
+            unselectedDotPath.addRoundRect(rectF, dotRadius, dotRadius, Path.Direction.CW);
+        }
+
+        // case #5 is handled by #getRetreatingJoinPath()
+        // this is done separately so that we can have a single retreating path spanning
+        // multiple dots and therefore animate it's movement smoothly
+
+        if (dotRevealFraction > MINIMAL_REVEAL) {
+
+            // case #6 – previously hidden dot revealing
+            unselectedDotPath.addCircle(centerX, dotCenterY, dotRevealFraction * dotRadius,
+                    Path.Direction.CW);
+        }
+
+        return unselectedDotPath;
+    }
+
+    private Path getRetreatingJoinPath() {
+        unselectedDotPath.rewind();
+        rectF.set(retreatingJoinX1, dotTopY, retreatingJoinX2, dotBottomY);
+        unselectedDotPath.addRoundRect(rectF, dotRadius, dotRadius, Path.Direction.CW);
+        return unselectedDotPath;
+    }
+
+    private void drawSelected(Canvas canvas) {
+        canvas.drawCircle(selectedDotX, dotCenterY, dotRadius, selectedPaint);
+    }
+
+    private void setSelectedPage(int now) {
+        if (now == currentPage) return;
+
+        pageChanging = true;
+        previousPage = currentPage;
+        currentPage = now;
+        final int steps = Math.abs(now - previousPage);
+
+        if (steps > 1) {
+            if (now > previousPage) {
+                for (int i = 0; i < steps; i++) {
+                    setJoiningFraction(previousPage + i, 1f);
+                }
+            } else {
+                for (int i = -1; i > -steps; i--) {
+                    setJoiningFraction(previousPage + i, 1f);
+                }
+            }
+        }
+
+        // create the anim to move the selected dot – this animator will kick off
+        // retreat animations when it has moved 75% of the way.
+        // The retreat animation in turn will kick of reveal anims when the
+        // retreat has passed any dots to be revealed
+        moveAnimation = createMoveSelectedAnimator(dotCenterX[now], previousPage, now, steps);
+        moveAnimation.start();
+    }
+
+    private ValueAnimator createMoveSelectedAnimator(
+            final float moveTo, int was, int now, int steps) {
+
+        // create the actual move animator
+        ValueAnimator moveSelected = ValueAnimator.ofFloat(selectedDotX, moveTo);
+
+        // also set up a pending retreat anim – this starts when the move is 75% complete
+        retreatAnimation = new PendingRetreatAnimator(was, now, steps,
+                now > was ?
+                        new RightwardStartPredicate(moveTo - ((moveTo - selectedDotX) * 0.25f)) :
+                        new LeftwardStartPredicate(moveTo + ((selectedDotX - moveTo) * 0.25f)));
+        retreatAnimation.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationEnd(Animator animation) {
+                resetState();
+                pageChanging = false;
+            }
+        });
+        moveSelected.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
+            @Override
+            public void onAnimationUpdate(ValueAnimator valueAnimator) {
+                // todo avoid autoboxing
+                selectedDotX = (Float) valueAnimator.getAnimatedValue();
+                retreatAnimation.startIfNecessary(selectedDotX);
+                postInvalidateOnAnimation();
+            }
+        });
+        moveSelected.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationStart(Animator animation) {
+                // set a flag so that we continue to draw the unselected dot in the target position
+                // until the selected dot has finished moving into place
+                selectedDotInPosition = false;
+            }
+
+            @Override
+            public void onAnimationEnd(Animator animation) {
+                // set a flag when anim finishes so that we don't draw both selected & unselected
+                // page dots
+                selectedDotInPosition = true;
+            }
+        });
+        // slightly delay the start to give the joins a chance to run
+        // unless dot isn't in position yet – then don't delay!
+        moveSelected.setStartDelay(selectedDotInPosition ? animDuration / 4l : 0l);
+        moveSelected.setDuration(animDuration * 3l / 4l);
+        moveSelected.setInterpolator(interpolator);
+        return moveSelected;
+    }
+
+    private void setJoiningFraction(int leftDot, float fraction) {
+        if (leftDot < joiningFractions.length) {
+
+            if (leftDot == 1) {
+                Log.d("PageIndicator", "dot 1 fraction:\t" + fraction);
+            }
+
+            joiningFractions[leftDot] = fraction;
+            postInvalidateOnAnimation();
+        }
+    }
+
+    private void clearJoiningFractions() {
+        Arrays.fill(joiningFractions, 0f);
+        postInvalidateOnAnimation();
+    }
+
+    private void setDotRevealFraction(int dot, float fraction) {
+        dotRevealFractions[dot] = fraction;
+        postInvalidateOnAnimation();
+    }
+
+    private void cancelJoiningAnimations() {
+        if (joiningAnimationSet != null && joiningAnimationSet.isRunning()) {
+            joiningAnimationSet.cancel();
+        }
+    }
+
+    /**
+     * A {@link ValueAnimator} that starts once a given predicate returns true.
+     */
+    public abstract class PendingStartAnimator extends ValueAnimator {
+
+        protected boolean hasStarted;
+        protected StartPredicate predicate;
+
+        public PendingStartAnimator(StartPredicate predicate) {
+            super();
+            this.predicate = predicate;
+            hasStarted = false;
+        }
+
+        public void startIfNecessary(float currentValue) {
+            if (!hasStarted && predicate.shouldStart(currentValue)) {
+                start();
+                hasStarted = true;
+            }
+        }
+    }
+
+    /**
+     * An Animator that shows and then shrinks a retreating join between the previous and newly
+     * selected pages.  This also sets up some pending dot reveals – to be started when the retreat
+     * has passed the dot to be revealed.
+     */
+    public class PendingRetreatAnimator extends PendingStartAnimator {
+
+        public PendingRetreatAnimator(int was, int now, int steps, StartPredicate predicate) {
+            super(predicate);
+            setDuration(animHalfDuration);
+            setInterpolator(interpolator);
+
+            // work out the start/end values of the retreating join from the direction we're
+            // travelling in.  Also look at the current selected dot position, i.e. we're moving on
+            // before a prior anim has finished.
+            final float initialX1 = now > was ? Math.min(dotCenterX[was], selectedDotX) - dotRadius
+                    : dotCenterX[now] - dotRadius;
+            final float finalX1 = now > was ? dotCenterX[now] - dotRadius
+                    : dotCenterX[now] - dotRadius;
+            final float initialX2 = now > was ? dotCenterX[now] + dotRadius
+                    : Math.max(dotCenterX[was], selectedDotX) + dotRadius;
+            final float finalX2 = now > was ? dotCenterX[now] + dotRadius
+                    : dotCenterX[now] + dotRadius;
+
+            revealAnimations = new PendingRevealAnimator[steps];
+            // hold on to the indexes of the dots that will be hidden by the retreat so that
+            // we can initialize their revealFraction's i.e. make sure they're hidden while the
+            // reveal animation runs
+            final int[] dotsToHide = new int[steps];
+            if (initialX1 != finalX1) { // rightward retreat
+                setFloatValues(initialX1, finalX1);
+                // create the reveal animations that will run when the retreat passes them
+                for (int i = 0; i < steps; i++) {
+                    revealAnimations[i] = new PendingRevealAnimator(was + i,
+                            new RightwardStartPredicate(dotCenterX[was + i]));
+                    dotsToHide[i] = was + i;
+                }
+                addUpdateListener(new AnimatorUpdateListener() {
+                    @Override
+                    public void onAnimationUpdate(ValueAnimator valueAnimator) {
+                        // todo avoid autoboxing
+                        retreatingJoinX1 = (Float) valueAnimator.getAnimatedValue();
+                        postInvalidateOnAnimation();
+                        // start any reveal animations if we've passed them
+                        for (PendingRevealAnimator pendingReveal : revealAnimations) {
+                            pendingReveal.startIfNecessary(retreatingJoinX1);
+                        }
+                    }
+                });
+            } else { // (initialX2 != finalX2) leftward retreat
+                setFloatValues(initialX2, finalX2);
+                // create the reveal animations that will run when the retreat passes them
+                for (int i = 0; i < steps; i++) {
+                    revealAnimations[i] = new PendingRevealAnimator(was - i,
+                            new LeftwardStartPredicate(dotCenterX[was - i]));
+                    dotsToHide[i] = was - i;
+                }
+                addUpdateListener(new AnimatorUpdateListener() {
+                    @Override
+                    public void onAnimationUpdate(ValueAnimator valueAnimator) {
+                        // todo avoid autoboxing
+                        retreatingJoinX2 = (Float) valueAnimator.getAnimatedValue();
+                        postInvalidateOnAnimation();
+                        // start any reveal animations if we've passed them
+                        for (PendingRevealAnimator pendingReveal : revealAnimations) {
+                            pendingReveal.startIfNecessary(retreatingJoinX2);
+                        }
+                    }
+                });
+            }
+
+            addListener(new AnimatorListenerAdapter() {
+                @Override
+                public void onAnimationStart(Animator animation) {
+                    cancelJoiningAnimations();
+                    clearJoiningFractions();
+                    // we need to set this so that the dots are hidden until the reveal anim runs
+                    for (int dot : dotsToHide) {
+                        setDotRevealFraction(dot, MINIMAL_REVEAL);
+                    }
+                    retreatingJoinX1 = initialX1;
+                    retreatingJoinX2 = initialX2;
+                    postInvalidateOnAnimation();
+                }
+
+                @Override
+                public void onAnimationEnd(Animator animation) {
+                    retreatingJoinX1 = INVALID_FRACTION;
+                    retreatingJoinX2 = INVALID_FRACTION;
+                    postInvalidateOnAnimation();
+                }
+            });
+        }
+    }
+
+    /**
+     * An Animator that animates a given dot's revealFraction i.e. scales it up
+     */
+    public class PendingRevealAnimator extends PendingStartAnimator {
+
+        private int dot;
+
+        public PendingRevealAnimator(int dot, StartPredicate predicate) {
+            super(predicate);
+            setFloatValues(MINIMAL_REVEAL, 1f);
+            this.dot = dot;
+            setDuration(animHalfDuration);
+            setInterpolator(interpolator);
+            addUpdateListener(new AnimatorUpdateListener() {
+                @Override
+                public void onAnimationUpdate(ValueAnimator valueAnimator) {
+                    // todo avoid autoboxing
+                    setDotRevealFraction(PendingRevealAnimator.this.dot,
+                            (Float) valueAnimator.getAnimatedValue());
+                }
+            });
+            addListener(new AnimatorListenerAdapter() {
+                @Override
+                public void onAnimationEnd(Animator animation) {
+                    setDotRevealFraction(PendingRevealAnimator.this.dot, 0f);
+                    postInvalidateOnAnimation();
+                }
+            });
+        }
+    }
+
+    /**
+     * A predicate used to start an animation when a test passes
+     */
+    public abstract class StartPredicate {
+
+        protected float thresholdValue;
+
+        public StartPredicate(float thresholdValue) {
+            this.thresholdValue = thresholdValue;
+        }
+
+        abstract boolean shouldStart(float currentValue);
+
+    }
+
+    /**
+     * A predicate used to start an animation when a given value is greater than a threshold
+     */
+    public class RightwardStartPredicate extends StartPredicate {
+
+        public RightwardStartPredicate(float thresholdValue) {
+            super(thresholdValue);
+        }
+
+        boolean shouldStart(float currentValue) {
+            return currentValue > thresholdValue;
+        }
+    }
+
+    /**
+     * A predicate used to start an animation then a given value is less than a threshold
+     */
+    public class LeftwardStartPredicate extends StartPredicate {
+
+        public LeftwardStartPredicate(float thresholdValue) {
+            super(thresholdValue);
+        }
+
+        boolean shouldStart(float currentValue) {
+            return currentValue < thresholdValue;
+        }
+    }
+}
diff --git a/core/src/main/kotlin/ca/allanwang/kau/widgets/TextSlider.kt b/core/src/main/kotlin/ca/allanwang/kau/widgets/TextSlider.kt
new file mode 100644
index 0000000..528dabc
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/widgets/TextSlider.kt
@@ -0,0 +1,125 @@
+package ca.allanwang.kau.widgets
+
+import android.content.Context
+import android.graphics.Color
+import android.support.v4.widget.TextViewCompat
+import android.text.TextUtils
+import android.util.AttributeSet
+import android.view.Gravity
+import android.view.animation.Animation
+import android.view.animation.AnimationUtils
+import android.widget.TextSwitcher
+import android.widget.TextView
+import ca.allanwang.kau.R
+import java.util.*
+
+/**
+ * Created by Allan Wang on 2017-06-21.
+ *
+ * Text switcher with global text color and embedded sliding animations
+ * Also has a stack to keep track of title changes
+ */
+class TextSlider @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null
+) : TextSwitcher(context, attrs) {
+
+    val titleStack: Stack<CharSequence?> = Stack()
+
+    /**
+     * Holds a mapping of animation types to their respective animations
+     */
+    val animationMap = mapOf(
+            ANIMATION_NONE to null,
+            ANIMATION_SLIDE_HORIZONTAL to AnimationBundle(
+                    R.anim.kau_slide_in_right, R.anim.kau_slide_out_left,
+                    R.anim.kau_slide_in_left, R.anim.kau_slide_out_right),
+            ANIMATION_SLIDE_VERTICAL to AnimationBundle(
+                    R.anim.kau_slide_in_bottom, R.anim.kau_slide_out_top,
+                    R.anim.kau_slide_in_top, R.anim.kau_slide_out_bottom
+            )
+    )
+
+    /**
+     * Holds lazy instances of the animations
+     */
+    inner class AnimationBundle(private val nextIn: Int, private val nextOut: Int, private val prevIn: Int, private val prevOut: Int) {
+        val NEXT_IN: Animation by lazy { AnimationUtils.loadAnimation(context, nextIn) }
+        val NEXT_OUT: Animation by lazy { AnimationUtils.loadAnimation(context, nextOut) }
+        val PREV_IN: Animation by lazy { AnimationUtils.loadAnimation(context, prevIn) }
+        val PREV_OUT: Animation by lazy { AnimationUtils.loadAnimation(context, prevOut) }
+    }
+
+    companion object {
+        const val ANIMATION_NONE = 1000
+        const val ANIMATION_SLIDE_HORIZONTAL = 1001
+        const val ANIMATION_SLIDE_VERTICAL = 1002
+    }
+
+    var animationType: Int = ANIMATION_SLIDE_HORIZONTAL
+
+    var textColor: Int = Color.WHITE
+        get() = field
+        set(value) {
+            field = value
+            (getChildAt(0) as TextView).setTextColor(value)
+            (getChildAt(1) as TextView).setTextColor(value)
+        }
+    val isRoot: Boolean
+        get() = titleStack.size <= 1
+
+    init {
+        if (attrs != null) {
+            val styledAttrs = context.obtainStyledAttributes(attrs, R.styleable.TextSlider)
+            animationType = styledAttrs.getInteger(R.styleable.TextSlider_animation_type, ANIMATION_SLIDE_HORIZONTAL)
+            styledAttrs.recycle()
+        }
+    }
+
+    override fun setText(text: CharSequence?) {
+        if ((currentView as TextView).text == text) return
+        super.setText(text)
+    }
+
+    override fun setCurrentText(text: CharSequence?) {
+        if (titleStack.isNotEmpty()) titleStack.pop()
+        titleStack.push(text)
+        super.setCurrentText(text)
+    }
+
+    fun setNextText(text: CharSequence?) {
+        if (titleStack.isEmpty()) {
+            setCurrentText(text)
+            return
+        }
+        titleStack.push(text)
+        val anim = animationMap[animationType]
+        inAnimation = anim?.NEXT_IN
+        outAnimation = anim?.NEXT_OUT
+        setText(text)
+    }
+
+    /**
+     * Sets the text as the previous title
+     * No further checks are done, so be sure to verify with [isRoot]
+     */
+    @Throws(EmptyStackException::class)
+    fun setPrevText() {
+        titleStack.pop()
+        val anim = animationMap[animationType]
+        inAnimation = anim?.PREV_IN
+        outAnimation = anim?.PREV_OUT
+        val text = titleStack.peek()
+        setText(text)
+    }
+
+    init {
+        setFactory {
+            TextView(context).apply {
+                //replica of toolbar title
+                gravity = Gravity.START
+                setSingleLine()
+                ellipsize = TextUtils.TruncateAt.END
+                TextViewCompat.setTextAppearance(this, R.style.TextAppearance_AppCompat_Title)
+            }
+        }
+    }
+}
\ No newline at end of file