code: protected void onBitmapLoaded(int position, Bitmap bitmap) {
          BitmapCache bc = cachedBitmaps.get(position);
          if (bc != null) {
              bc.status = bitmap == null ? SlideStatus.NOT_AVAILABLE : SlideStatus.READY;
              bc.bitmap = new WeakReference<Bitmap>(bitmap);
          }
      }
docs: This function should be called by subclasses once they have actually loaded the bitmap.
  
  @param position the position of the item
  @param bitmap   the bitmap that has been loaded