Improve emoji picker accessibility (#944)

* set emoji shortcode as content description on ImageView

* hide bottom sheets on back press

app/src/main/java/com/keylesspalace/tusky/ComposeActivity.java

@@ -1479,6 +1479,16 @@ public final class ComposeActivity
     }
 
     private void handleCloseButton() {
+
+        if(composeOptionsBehavior.getState() == BottomSheetBehavior.STATE_EXPANDED ||
+                addMediaBehavior.getState() == BottomSheetBehavior.STATE_EXPANDED ||
+                emojiBehavior.getState() == BottomSheetBehavior.STATE_EXPANDED ) {
+            composeOptionsBehavior.setState(BottomSheetBehavior.STATE_HIDDEN);
+            addMediaBehavior.setState(BottomSheetBehavior.STATE_HIDDEN);
+            emojiBehavior.setState(BottomSheetBehavior.STATE_HIDDEN);
+            return;
+        }
+
         CharSequence contentText = textEditor.getText();
         CharSequence contentWarning = contentWarningEditor.getText();
 

app/src/main/java/com/keylesspalace/tusky/adapter/EmojiAdapter.kt

@@ -35,20 +35,22 @@ class EmojiAdapter(emojiList: List<Emoji>, private val onEmojiSelectedListener:
     }
 
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): EmojiAdapter.EmojiHolder {
-
-                val view = LayoutInflater.from(parent.context).inflate(R.layout.item_emoji_button, parent, false) as ImageView
-                return EmojiHolder(view)
-
+        val view = LayoutInflater.from(parent.context).inflate(R.layout.item_emoji_button, parent, false) as ImageView
+        return EmojiHolder(view)
     }
 
     override fun onBindViewHolder(viewHolder: EmojiAdapter.EmojiHolder, position: Int) {
+        val emoji = emojiList[position]
+
         Picasso.with(viewHolder.emojiImageView.context)
-                .load(emojiList[position].url)
+                .load(emoji.url)
                 .into(viewHolder.emojiImageView)
 
         viewHolder.emojiImageView.setOnClickListener {
-            onEmojiSelectedListener.onEmojiSelected(emojiList[position].shortcode)
+            onEmojiSelectedListener.onEmojiSelected(emoji.shortcode)
         }
+
+        viewHolder.emojiImageView.contentDescription = emoji.shortcode
     }
 
     class EmojiHolder(val emojiImageView: ImageView) : RecyclerView.ViewHolder(emojiImageView)