@Override
  public void stop() {
    mDrawable.stopAnimation();
    mAnimating = false;
  }
Animation of KeyframesDrawables needs to be explicitly started and stopped.
AnimatableKeyframesDrawable wraps a KeyframesDrawables and allows Fresco to automatically start
and stop the animated as needed (as long as setAutoPlayAnimations(true) is called on the
DraweeController associated with the DraweeView used to display the image.
samples/showcase/src/main/java/com/facebook/fresco/samples/showcase/imageformat/keyframes/AnimatableKeyframesDrawable.java