code: public static Animation pushDownIn() {
          AnimationSet animationSet = new AnimationSet(true);
          animationSet.setFillAfter(true);
          animationSet.addAnimation(new TranslateAnimation(0, 0, -100, 0));
          animationSet.addAnimation(new AlphaAnimation(0.0f, 1.0f));
          return animationSet;
      }
docs: Create push down animation for entering.
  
  @return Animation