Make sure startAnimation won't be called after onPause.

Change-Id: I6c5238394b2ad64e22fbcb250ecd1534da7e8d03
fix: 5629252

src/com/android/gallery3d/ui/SlotView.java

diff --git a/src/com/android/gallery3d/ui/SlotView.java b/src/com/android/gallery3d/ui/SlotView.java
index a6e94d2..3e0e2f2 100644
--- a/src/com/android/gallery3d/ui/SlotView.java
+++ b/src/com/android/gallery3d/ui/SlotView.java
@@ -18,6 +18,7 @@
 
 import android.content.Context;
 import android.graphics.Rect;
+import android.os.Handler;
 import android.view.GestureDetector;
 import android.view.MotionEvent;
 import android.view.animation.DecelerateInterpolator;
@@ -81,6 +82,7 @@
     // whether the down action happened while the view is scrolling.
     private boolean mDownInScrolling;
     private int mOverscrollEffect = OVERSCROLL_3D;
+    private final Handler mHandler;
 
     public static final int OVERSCROLL_3D = 0;
     public static final int OVERSCROLL_SYSTEM = 1;
@@ -90,6 +92,7 @@
         mGestureDetector =
                 new GestureDetector(context, new MyGestureListener());
         mScroller = new ScrollerHelper(context);
+        mHandler = new Handler(context.getMainLooper());
     }
 
     public void setCenterIndex(int index) {
@@ -323,8 +326,15 @@
         }
 
         if (more) invalidate();
-        if (mMoreAnimation && !more && mUIListener != null) {
-            mUIListener.onUserInteractionEnd();
+
+        final UserInteractionListener listener = mUIListener;
+        if (mMoreAnimation && !more && listener != null) {
+            mHandler.post(new Runnable() {
+                @Override
+                public void run() {
+                    listener.onUserInteractionEnd();
+                }
+            });
         }
         mMoreAnimation = more;
     }