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# KAU
Kotlin Android Utils
This library contains small helper functions used throughout almost all of my other projects. The goal is to make common interactions executable in a single line.
# Features
* [KPrefs](#kprefs)
* [Changelog Xml](#changelog)
* [Extensions](#extensions)
<a name="kprefs"></a>
## KPrefs
A typical SharedPreference contains items that look like so:
```Java
class MyPrefs {
public static final String TEXT_COLOR = "text_color";
private static SharedPreference prefs = ...
public static void setTextColor(int color) {
prefs.edit().putInt(TEXT_COLOR, color).apply();
}
public static int getTextColor() {
prefs.getInt(TEXT_COLOR, 0xff000000);
}
}
```
KPrefs greatly simplifies it by using Kotlin's object pattern and delegates to achieve the following:
```Kotlin
object KPrefSample : KPref() {
var textColor: Int by kpref("TEXT_COLOR", Color.WHITE)
var bgColor: Int by kpref("BG_COLOR", Color.BLACK)
var isFirstLaunch: Boolean by kpref("IS_FIRST_LAUNCH", true)
...
}
```
By using `KPrefSample.textColor = Color.RED` or `textView.setTextColor(KPrefSample.textColor)` we can effectively set and save the value.
The values are retrieved lazily and are only done so once; future retrievals will be done with a local value, and updating a preference will both save it in the SharedPreference and update it locally.
The object inherits the initializer method `fun initialize(c: Context, preferenceName: String)`, which must be invoked (preferably in the Application class) before using a preference.
There is also a `reset()` method to clear the local values and have them retrieve from the SharedPreference again
<a name="changelog"></a>
## Changelog XML
Create an xml resource with the following structure:
```xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<version title="v0.1" />
<item text="Initial Changelog" />
<item text="Bullet point here" />
<item text="More points" />
<item text="" /> <!-- this one is empty and therefore ignored -->
</resources>
```
And show it with `context.showChangelog(@XmlRes xmlRes: Int)`
As mentioned, blank items will be ignored, so feel free to create a bunch of empty lines to facilitate updating the items in the future.
<a name="extensions"></a>
## Extension Functions
> "[Extensions](https://kotlinlang.org/docs/reference/extensions.html) provides the ability to extend a class with new functionality without having to inherit from the class"
### AnimUtils
> Extends View
* Fade In/Fade Out/Circle Reveal with callbacks
* Switch texts in a TextView with a fade transition
### ColorUtils
> Extends Int
* Check if color is dark or light
* Check if color is visible against another color
* Convert color to HSV (float[]) or hex (String)
* Get the disabled color of a theme
* Adjust alpha
> Extends String
* Parses color; adds onto the original parser by supporting #AAA values
> Extends View
* Various tinting for different views; taken from [MDTintHelper](https://github.com/afollestad/material-dialogs/blob/master/core/src/main/java/com/afollestad/materialdialogs/internal/MDTintHelper.java)
### ContextUtils
> Extends Activity
* Restart an activity
> Extends Context
* Create a toast directly
* Get resource values through `.color(id)`, `.dimen(id)`, `.drawable(id)`, `.integer(id)`, `.string(id)`
* Get attribute values through resolve methods
* Show a Changelog by parsing an xml resource
* Check if network is available
### FragmentUtils
> Extends Fragment
* Directly put extras into a fragment; if a bundle does not exist, it will be created
### IIconUtils
> Extends [IIcon](https://github.com/mikepenz/Android-Iconics)
* toDrawable method that only requires a context; defaults to a white icon of size 24dp and uses a ColorStateList to allow for dimming
### Utils [Misc]
> Extends Int
* dpToPx & pxToDp conversions
### ViewUtils
> Extends View
* `visible()`, `invisible()`, `gone()`, `isVisible()`, `isInvisible()`, `isGone()` methods
* matchParent method to set the layout params to match_parent
* Create snackbar directly
* Set IIcon into ImageView directly
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