diff options
Diffstat (limited to 'imagepicker/src/main/kotlin/ca/allanwang/kau/imagepicker/ImagePickerActivityBase.kt')
| -rw-r--r-- | imagepicker/src/main/kotlin/ca/allanwang/kau/imagepicker/ImagePickerActivityBase.kt | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/imagepicker/src/main/kotlin/ca/allanwang/kau/imagepicker/ImagePickerActivityBase.kt b/imagepicker/src/main/kotlin/ca/allanwang/kau/imagepicker/ImagePickerActivityBase.kt new file mode 100644 index 0000000..9d988d1 --- /dev/null +++ b/imagepicker/src/main/kotlin/ca/allanwang/kau/imagepicker/ImagePickerActivityBase.kt @@ -0,0 +1,200 @@ +package ca.allanwang.kau.imagepicker + +import android.Manifest +import android.app.Activity +import android.content.Context +import android.content.Intent +import android.database.Cursor +import android.os.Bundle +import android.provider.MediaStore +import android.support.design.widget.AppBarLayout +import android.support.design.widget.CoordinatorLayout +import android.support.design.widget.FloatingActionButton +import android.support.v4.app.LoaderManager +import android.support.v4.content.CursorLoader +import android.support.v4.content.Loader +import android.support.v7.app.AppCompatActivity +import android.support.v7.widget.GridLayoutManager +import android.support.v7.widget.LinearLayoutManager +import android.support.v7.widget.RecyclerView +import android.support.v7.widget.Toolbar +import android.widget.TextView +import ca.allanwang.kau.animators.FadeScaleAnimatorAdd +import ca.allanwang.kau.animators.KauAnimator +import ca.allanwang.kau.permissions.kauRequestPermissions +import ca.allanwang.kau.utils.* +import com.mikepenz.fastadapter.commons.adapters.FastItemAdapter +import com.mikepenz.google_material_typeface_library.GoogleMaterial + + +/** + * Created by Allan Wang on 2017-07-04. + * + * Base activity for selecting images from storage + */ +abstract class ImagePickerActivityBase : AppCompatActivity(), LoaderManager.LoaderCallbacks<Cursor> { + + val imageAdapter = FastItemAdapter<ImageItem>() + + val coordinator: CoordinatorLayout by bindView(R.id.kau_coordinator) + val toolbar: Toolbar by bindView(R.id.kau_toolbar) + val selectionCount: TextView by bindView(R.id.kau_selection_count) + val recycler: RecyclerView by bindView(R.id.kau_recyclerview) + val fab: FloatingActionButton by bindView(R.id.kau_fab) + + companion object { + /** + * Given the dimensions of our device and a minimum image size, + * Computer the optimal column count for our grid layout + * + * @return column count + */ + fun computeColumnCount(context: Context): Int { + val minImageSizePx = context.dimenPixelSize(R.dimen.kau_image_minimum_size) + val screenWidthPx = context.resources.displayMetrics.widthPixels + return screenWidthPx / minImageSizePx + } + + var accentColor: Int = 0xff666666.toInt() + + fun onImagePickerResult(resultCode: Int, data: Intent?): List<ImageModel> { + if (resultCode != Activity.RESULT_OK || data == null || !data.hasExtra(IMAGE_PICKER_RESULT)) + return emptyList() + return data.getParcelableArrayListExtra(IMAGE_PICKER_RESULT) + } + } + + override fun onCreate(savedInstanceState: Bundle?) { + super.onCreate(savedInstanceState) + + setContentView(R.layout.kau_activity_image_picker) + + selectionCount.setCompoundDrawables(null, null, GoogleMaterial.Icon.gmd_image.toDrawable(this, 18), null) + + setSupportActionBar(toolbar) + supportActionBar?.apply { + setDisplayHomeAsUpEnabled(true) + setDisplayShowHomeEnabled(true) + setHomeAsUpIndicator(GoogleMaterial.Icon.gmd_close.toDrawable(this@ImagePickerActivityBase, 18)) + } + toolbar.setNavigationOnClickListener { onBackPressed() } + + recycler.apply { + layoutManager = GridLayoutManager(context, computeColumnCount(context)) + adapter = imageAdapter + setHasFixedSize(true) + itemAnimator = KauAnimator(FadeScaleAnimatorAdd(0.8f)) + } + + ImageItem.bindEvents(imageAdapter) + imageAdapter.withSelectionListener({ _, _ -> selectionCount.text = imageAdapter.selections.size.toString() }) + + fab.apply { + show() + setIcon(GoogleMaterial.Icon.gmd_send) + setOnClickListener { + val selection = imageAdapter.selectedItems + if (selection.isEmpty()) { + toast(R.string.kau_no_images_selected) + } else { + val intent = Intent() + val data = ArrayList(selection.map { it.data }) + intent.putParcelableArrayListExtra(IMAGE_PICKER_RESULT, data) + setResult(RESULT_OK, intent) + finish() + } + } + hideOnDownwardsScroll(recycler) + } + + loadImages() + } + + /** + * Request read permissions and load all external images + * The result will be filtered through {@link #onLoadFinished(Loader, Cursor)} + * Call this to make sure that we request permissions each time + * The adapter will be cleared on each successful call + */ + private fun loadImages() { + kauRequestPermissions(Manifest.permission.READ_EXTERNAL_STORAGE) { + granted, _ -> + if (granted) { + supportLoaderManager.initLoader(LOADER_ID, null, this) + setToolbarScrollable(true) + } else { + toast(R.string.kau_permission_denied) + setToolbarScrollable(false) + } + } + } + + /** + * Decide whether the toolbar can hide itself + * We typically want this behaviour unless we don't have enough images + * to fill the entire screen. In that case we don't want the recyclerview to be scrollable + * which means the toolbar shouldn't scroll either + + * @param scrollable true if scroll flags are enabled, false otherwise + */ + private fun setToolbarScrollable(scrollable: Boolean) { + val params = toolbar.layoutParams as AppBarLayout.LayoutParams + if (scrollable) + params.scrollFlags = AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS or AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL + else + params.scrollFlags = 0 + } + + override fun onCreateLoader(id: Int, args: Bundle?): Loader<Cursor> { + val columns = arrayOf( + MediaStore.Images.Media._ID, + MediaStore.Images.Media.TITLE, + MediaStore.Images.Media.DATA, + MediaStore.Images.Media.SIZE, + MediaStore.Images.Media.DISPLAY_NAME, + MediaStore.Images.Media.DATE_MODIFIED + ) + return CursorLoader(this, + MediaStore.Images.Media.EXTERNAL_CONTENT_URI, + columns, + null, + null, + //Sort by descending date + MediaStore.Images.Media.DATE_MODIFIED + " DESC") + } + + override fun onLoadFinished(loader: Loader<Cursor>, data: Cursor?) { + reset() + if (data == null || !data.moveToFirst()) { + toast(R.string.kau_no_images_found) + setToolbarScrollable(false) + return + } + do { + val model = ImageModel(data) + if (!shouldLoad(model)) continue + imageAdapter.add(ImageItem(model)) + } while (data.moveToNext()) + setToolbarScrollable((recycler.layoutManager as LinearLayoutManager).findLastCompletelyVisibleItemPosition() < imageAdapter.getItemCount() - 1) + } + + /** + * Optional filter to decide which images get displayed + * Defaults to checking their sizes to filter out + * very small images such as lurking drawables/icons + * + * Returns true if model should be displayed, false otherwise + */ + open fun shouldLoad(model: ImageModel): Boolean = model.size > 10000L + + private fun reset() { + imageAdapter.clear(); + } + + override fun onLoaderReset(loader: Loader<Cursor>) = reset() + + override fun onBackPressed() { + setResult(RESULT_CANCELED) + super.onBackPressed() + } +}
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