Fix overwriting accessibility delegate in setKeyboard

A keyboard accessibility delegate object should be a singleton for
each keyboard view.

Bug: 15437933
Bug: 15419386
Change-Id: Ia70853c644d950ea6130c1f209b89929b1cb1ee5

java/src/com/android/inputmethod/keyboard/MainKeyboardView.java

@@ -382,7 +382,9 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
         mLanguageOnSpacebarTextSize = keyHeight * mLanguageOnSpacebarTextRatio;
 
         if (AccessibilityUtils.getInstance().isAccessibilityEnabled()) {
+            if (mAccessibilityDelegate == null) {
                 mAccessibilityDelegate = new MainKeyboardAccessibilityDelegate(this, mKeyDetector);
+            }
             mAccessibilityDelegate.setKeyboard(keyboard);
         } else {
             mAccessibilityDelegate = null;

java/src/com/android/inputmethod/keyboard/MoreKeysKeyboardView.java

@@ -77,10 +77,13 @@ public class MoreKeysKeyboardView extends KeyboardView implements MoreKeysPanel
             // discarded at {@link InputView#dispatchHoverEvent(MotionEvent)}. Because only a hover
             // event that is on this view is dispatched by the platform, we should use a
             // {@link KeyDetector} that has no sliding allowance and no hysteresis.
+            if (mAccessibilityDelegate == null) {
                 mKeyDetector = new KeyDetector();
-            mAccessibilityDelegate = new MoreKeysKeyboardAccessibilityDelegate(this, mKeyDetector);
+                mAccessibilityDelegate = new MoreKeysKeyboardAccessibilityDelegate(
+                        this, mKeyDetector);
                 mAccessibilityDelegate.setOpenAnnounce(R.string.spoken_open_more_keys_keyboard);
                 mAccessibilityDelegate.setCloseAnnounce(R.string.spoken_close_more_keys_keyboard);
+            }
             mAccessibilityDelegate.setKeyboard(keyboard);
         } else {
             mKeyDetector = new MoreKeysDetector(getResources().getDimension(

java/src/com/android/inputmethod/keyboard/emoji/EmojiPageKeyboardView.java

@@ -55,7 +55,7 @@ final class EmojiPageKeyboardView extends KeyboardView implements
     private OnKeyEventListener mListener = EMPTY_LISTENER;
     private final KeyDetector mKeyDetector = new KeyDetector();
     private final GestureDetector mGestureDetector;
-    private final KeyboardAccessibilityDelegate<EmojiPageKeyboardView> mAccessibilityDelegate;
+    private KeyboardAccessibilityDelegate<EmojiPageKeyboardView> mAccessibilityDelegate;
 
     public EmojiPageKeyboardView(final Context context, final AttributeSet attrs) {
         this(context, attrs, R.attr.keyboardViewStyle);
@@ -67,7 +67,6 @@ final class EmojiPageKeyboardView extends KeyboardView implements
         mGestureDetector = new GestureDetector(context, this);
         mGestureDetector.setIsLongpressEnabled(false /* isLongpressEnabled */);
         mHandler = new Handler();
-        mAccessibilityDelegate = new KeyboardAccessibilityDelegate<>(this, mKeyDetector);
     }
 
     public void setOnKeyEventListener(final OnKeyEventListener listener) {
@@ -81,6 +80,14 @@ final class EmojiPageKeyboardView extends KeyboardView implements
     public void setKeyboard(final Keyboard keyboard) {
         super.setKeyboard(keyboard);
         mKeyDetector.setKeyboard(keyboard, 0 /* correctionX */, 0 /* correctionY */);
+        if (AccessibilityUtils.getInstance().isAccessibilityEnabled()) {
+            if (mAccessibilityDelegate == null) {
+                mAccessibilityDelegate = new KeyboardAccessibilityDelegate<>(this, mKeyDetector);
+            }
+            mAccessibilityDelegate.setKeyboard(keyboard);
+        } else {
+            mAccessibilityDelegate = null;
+        }
     }
 
     /**
@@ -88,8 +95,10 @@ final class EmojiPageKeyboardView extends KeyboardView implements
      */
     @Override
     public boolean onHoverEvent(final MotionEvent event) {
-        if (AccessibilityUtils.getInstance().isTouchExplorationEnabled()) {
-            return mAccessibilityDelegate.onHoverEvent(event);
+        final KeyboardAccessibilityDelegate<EmojiPageKeyboardView> accessibilityDelegate =
+                mAccessibilityDelegate;
+        if (accessibilityDelegate != null) {
+            return accessibilityDelegate.onHoverEvent(event);
         }
         return super.onHoverEvent(event);
     }

java/src/com/android/inputmethod/latin/suggestions/MoreSuggestionsView.java

@@ -56,11 +56,19 @@ public final class MoreSuggestionsView extends MoreKeysKeyboardView {
         super.setKeyboard(keyboard);
         // With accessibility mode off, {@link #mAccessibilityDelegate} is set to null at the
         // above {@link MoreKeysKeyboardView#setKeyboard(Keyboard)} call.
+        // With accessibility mode on, {@link #mAccessibilityDelegate} is set to a
+        // {@link MoreKeysKeyboardAccessibilityDelegate} object at the above
+        // {@link MoreKeysKeyboardView#setKeyboard(Keyboard)} call. And the object has to be
+        // overwritten by a {@link MoreSuggestionsAccessibilityDelegate} object here.
         if (AccessibilityUtils.getInstance().isAccessibilityEnabled()) {
-            mAccessibilityDelegate = new MoreSuggestionsAccessibilityDelegate(this, mKeyDetector);
+            if (!(mAccessibilityDelegate instanceof MoreSuggestionsAccessibilityDelegate)) {
+                mAccessibilityDelegate = new MoreSuggestionsAccessibilityDelegate(
+                        this, mKeyDetector);
                 mAccessibilityDelegate.setOpenAnnounce(R.string.spoken_open_more_suggestions);
                 mAccessibilityDelegate.setCloseAnnounce(R.string.spoken_close_more_suggestions);
             }
+            mAccessibilityDelegate.setKeyboard(keyboard);
+        }
     }
 
     @Override