private void prepareAnimationBackToFilmstrip(int slotIndex) {
   if (mAlbumDataAdapter == null || !mAlbumDataAdapter.isActive(slotIndex)) return;
   MediaItem item = mAlbumDataAdapter.get(slotIndex);
   if (item == null) return;
   TransitionStore transitions = mActivity.getTransitionStore();
   transitions.put(PhotoPage.KEY_INDEX_HINT, slotIndex);
   transitions.put(PhotoPage.KEY_OPEN_ANIMATION_RECT, mSlotView.getSlotRect(slotIndex, mRootPane));
 }