@Override
  public void onStop() {
    super.onStop();

    // close bitmaps
    mImageView.setImageBitmap(null);
    CloseableReference.closeSafely(mOriginalBitmap);
    CloseableReference.closeSafely(mDisplayedBitmap);
  }
Reference to the currently displayed bitmap
samples/showcase/src/main/java/com/facebook/fresco/samples/showcase/imagepipeline/ImagePipelineBitmapFactoryFragment.java