code: @Override
      public void prepareSlide(int position) {
          BitmapCache bc = cachedBitmaps.get(position);
          if (bc != null && bc.bitmap != null && bc.bitmap.get() != null) {
              bc.bitmap.get().recycle();
              bc.bitmap.clear();
          }
  
          bc = new BitmapCache();
          cachedBitmaps.put(position, bc);
  
          loadBitmap(position);
      }
docs: ==