@Override
  public void onScroll(int scrolledY) {
    super.onScroll(scrolledY);

    mBoundedTranslatedRatio = clamp(getTranslationRatio(), 0f, 1f);

    if (hasAnimatorBundles) {
      mAnimatorBuilder.animateOnScroll(mBoundedTranslatedRatio, getHeader().getTranslationY());
    }
  }
 @Override
 protected void onAnimatorReady() {
   super.onAnimatorReady();
   mAnimatorBuilder = getAnimatorBuilder();
   hasAnimatorBundles = (mAnimatorBuilder != null) && (mAnimatorBuilder.hasAnimatorBundles());
 }