code: public boolean isInBitmapMemoryCache(final Uri uri) {
      if (uri == null) {
        return false;
      }
      Predicate<CacheKey> bitmapCachePredicate = predicateForUri(uri);
      return mBitmapMemoryCache.contains(bitmapCachePredicate);
    }
docs: Returns whether the image is stored in the bitmap memory cache.
  
  @param uri the uri for the image to be looked up.
  @return true if the image was found in the bitmap memory cache, false otherwise