Reduce memory of emoji palette

Bug: 10902556
Change-Id: I3c8da35a601de2bfb248292c7b59235fc1120988

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

@@ -74,6 +74,7 @@ public final class EmojiPalettesView extends LinearLayout implements OnTabChange
         ViewPager.OnPageChangeListener, View.OnClickListener,
         ScrollKeyboardView.OnKeyClickListener {
     private static final String TAG = EmojiPalettesView.class.getSimpleName();
+    private static final boolean DEBUG_PAGER = false;
     private final int mKeyBackgroundId;
     private final int mEmojiFunctionalKeyBackgroundId;
     private final KeyboardLayoutSet mLayoutSet;
@@ -566,6 +567,20 @@ public final class EmojiPalettesView extends LinearLayout implements OnTabChange
         // TODO:
     }
 
+    public void startEmojiPalettes() {
+        if (DEBUG_PAGER) {
+            Log.d(TAG, "allocate emoji palettes memory");
+        }
+        mEmojiPager.setAdapter(mEmojiPalettesAdapter);
+    }
+
+    public void stopEmojiPalettes() {
+        if (DEBUG_PAGER) {
+            Log.d(TAG, "deallocate emoji palettes memory");
+        }
+        mEmojiPager.setAdapter(null);
+    }
+
     public void setKeyboardActionListener(final KeyboardActionListener listener) {
         mKeyboardActionListener = listener;
         mDeleteKeyOnTouchListener.setKeyboardActionListener(mKeyboardActionListener);
@@ -663,6 +678,9 @@ public final class EmojiPalettesView extends LinearLayout implements OnTabChange
 
         @Override
         public Object instantiateItem(final ViewGroup container, final int position) {
+            if (DEBUG_PAGER) {
+                Log.d(TAG, "instantiate item: " + position);
+            }
             final ScrollKeyboardView oldKeyboardView = mActiveKeyboardViews.get(position);
             if (oldKeyboardView != null) {
                 oldKeyboardView.deallocateMemory();
@@ -694,6 +712,9 @@ public final class EmojiPalettesView extends LinearLayout implements OnTabChange
         @Override
         public void destroyItem(final ViewGroup container, final int position,
                 final Object object) {
+            if (DEBUG_PAGER) {
+                Log.d(TAG, "destroy item: " + position + ", " + object.getClass().getSimpleName());
+            }
             final ScrollKeyboardView keyboardView = mActiveKeyboardViews.get(position);
             if (keyboardView != null) {
                 keyboardView.deallocateMemory();

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

@@ -260,12 +260,14 @@ public final class KeyboardSwitcher implements KeyboardState.SwitchActions {
     private void setMainKeyboardFrame() {
         mMainKeyboardFrame.setVisibility(View.VISIBLE);
         mEmojiPalettesView.setVisibility(View.GONE);
+        mEmojiPalettesView.stopEmojiPalettes();
     }
 
     // Implements {@link KeyboardState.SwitchActions}.
     @Override
     public void setEmojiKeyboard() {
         mMainKeyboardFrame.setVisibility(View.GONE);
+        mEmojiPalettesView.startEmojiPalettes();
         mEmojiPalettesView.setVisibility(View.VISIBLE);
     }
 
@@ -336,6 +338,16 @@ public final class KeyboardSwitcher implements KeyboardState.SwitchActions {
         return mKeyboardView;
     }
 
+    public void deallocateMemory() {
+        if (mKeyboardView != null) {
+            mKeyboardView.cancelAllOngoingEvents();
+            mKeyboardView.deallocateMemory();
+        }
+        if (mEmojiPalettesView != null) {
+            mEmojiPalettesView.stopEmojiPalettes();
+        }
+    }
+
     public View onCreateInputView(final boolean isHardwareAcceleratedDrawingEnabled) {
         if (mKeyboardView != null) {
             mKeyboardView.closing();

java/src/com/android/inputmethod/latin/LatinIME.java

@@ -1049,11 +1049,7 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
     private void onFinishInputViewInternal(final boolean finishingInput) {
         super.onFinishInputView(finishingInput);
         mKeyboardSwitcher.onFinishInputView();
-        final MainKeyboardView mainKeyboardView = mKeyboardSwitcher.getMainKeyboardView();
+        mKeyboardSwitcher.deallocateMemory();
-        if (mainKeyboardView != null) {
-            mainKeyboardView.cancelAllOngoingEvents();
-            mainKeyboardView.deallocateMemory();
-        }
         // Remove pending messages related to update suggestions
         mHandler.cancelUpdateSuggestionStrip();
         // Should do the following in onFinishInputInternal but until JB MR2 it's not called :(