code: @Override
      public void onNextItemAppear(View view) {
  
          View descriptionLayout = view.findViewById(R.id.description_layout);
          if(descriptionLayout!=null){
              float layoutY = ViewHelper.getY(descriptionLayout);
              view.findViewById(R.id.description_layout).setVisibility(View.VISIBLE);
              ValueAnimator animator = ObjectAnimator.ofFloat(
                      descriptionLayout,"y",layoutY + descriptionLayout.getHeight(),
                      layoutY).setDuration(500);
              animator.start();
          }
  
      }
docs: When next item show in ViewPagerEx, let's make an animation to show the
  description layout.
  @param view