Fix memory leak of Dnd tile

The instance of Dnd tile leaks when user taps the edit button
of Quick Settings. To fix this issue, QSTile#destroy should be
called when the tile is no longer needed.

Bug: 32103239
Test: manual - go to Quick Settings -> Edit repeatedly

Change-Id: I9bc9ee836be5c8e46eb1ccd202bd5cc50070ef47

packages/SystemUI/src/com/android/systemui/qs/customize/TileQueryHelper.java

@@ -65,7 +65,10 @@ public class TileQueryHelper {
         for (int i = 0; i < possibleTiles.length; i++) {
             final String spec = possibleTiles[i];
             final QSTile<?> tile = host.createTile(spec);
-            if (tile == null || !tile.isAvailable()) {
+            if (tile == null) {
+                continue;
+            } else if (!tile.isAvailable()) {
+                tile.destroy();
                 continue;
             }
             tile.setListening(this, true);
@@ -79,6 +82,7 @@ public class TileQueryHelper {
                     tile.getState().copyTo(state);
                     // Ignore the current state and get the generic label instead.
                     state.label = tile.getTileLabel();
+                    tile.destroy();
                     mainHandler.post(new Runnable() {
                         @Override
                         public void run() {

packages/SystemUI/src/com/android/systemui/qs/tiles/DndTile.java

@@ -68,12 +68,23 @@ public class DndTile extends QSTile<QSTile.BooleanState> {
 
     private boolean mListening;
     private boolean mShowingDetail;
+    private boolean mReceiverRegistered;
 
     public DndTile(Host host) {
         super(host);
         mController = host.getZenModeController();
         mDetailAdapter = new DndDetailAdapter();
         mContext.registerReceiver(mReceiver, new IntentFilter(ACTION_SET_VISIBLE));
+        mReceiverRegistered = true;
+    }
+
+    @Override
+    protected void handleDestroy() {
+        super.handleDestroy();
+        if (mReceiverRegistered) {
+            mContext.unregisterReceiver(mReceiver);
+            mReceiverRegistered = false;
+        }
     }
 
     public static void setVisible(Context context, boolean visible) {