All runnable are stopped on detach. DO NOT MERGE.

This prevents these runnable from holding a reference to the context
that will prevent it from being garbage collected.

The blinking cursor is especially bad and appears in memore traces.

Change-Id: I8acbfbbfc59975dfd7bcf06e941074ea7dc0b0bc

Author: Gilles Debunne

core/java/android/widget/TextView.java

@@ -3810,6 +3810,18 @@ protected void onDetachedFromWindow() {
             hideError();
         }
 
+        if (mBlink != null) {
+            mBlink.cancel();
+        }
+
+        if (mInsertionPointCursorController != null) {
+            mInsertionPointCursorController.onDetached();
+        }
+
+        if (mSelectionModifierCursorController != null) {
+            mSelectionModifierCursorController.onDetached();
+        }
+
         hideControllers();
     }
 
@@ -7720,6 +7732,13 @@ private interface CursorController extends ViewTreeObserver.OnTouchModeChangeLis
          * @param event The touch event
          */
         public boolean onTouchEvent(MotionEvent event);
+
+        /**
+         * Called when the view is detached from window. Perform house keeping task, such as
+         * stopping Runnable thread that would otherwise keep a reference on the context, thus
+         * preventing the activity to be recycled.
+         */
+        public void onDetached();
     }
 
     private class HandleView extends View {
@@ -7997,12 +8016,12 @@ public void show() {
 
         public void hide() {
             mHandle.hide();
-            TextView.this.removeCallbacks(mHider);
+            removeCallbacks(mHider);
         }
 
         private void hideDelayed(int msec) {
-            TextView.this.removeCallbacks(mHider);
-            TextView.this.postDelayed(mHider, msec);
+            removeCallbacks(mHider);
+            postDelayed(mHider, msec);
         }
 
         public boolean isShowing() {
@@ -8042,6 +8061,11 @@ public void onTouchModeChanged(boolean isInTouchMode) {
                 hide();
             }
         }
+
+        @Override
+        public void onDetached() {
+            removeCallbacks(mHider);
+        }
     }
 
     private class SelectionModifierCursorController implements CursorController {
@@ -8219,6 +8243,11 @@ public void onTouchModeChanged(boolean isInTouchMode) {
                 hide();
             }
         }
+
+        @Override
+        public void onDetached() {
+            removeCallbacks(mHider);
+        }
     }
 
     private void hideInsertionPointCursorController() {