Animations

CustomAnimationUtils.java

public class CustomAnimationUtils {
  public static void animateY(@NonNull View view, int startY, int endY, int duration) {
    animateY(view, startY, endY, duration, new AccelerateDecelerateInterpolator());
  }
  
  public static void animateY(@NonNull View view, int startY, int endY, int duration,
                              @NonNull Interpolator interpolator) {

    view.clearAnimation();
    
    view.setTranslationY(startY);
    ViewCompat.animate(view).translationY(endY)
              .setInterpolator(interpolator)
              .setDuration(duration)
              .withLayer()
              .setListener(null)
              .start();
    }
}

IndieAnimations.java

private void animateIn() {
  
  // Get view from PagerAdapter or ViewPager -> viewPager.getChildAt(0)
  
  View page0 = adapter.getViewAt(0);
  View page1 = adapter.getViewAt(1);
  
  // Make second page appear slower than the first one
  // so that user notices there are more pages
  
  CustomAnimationUtils.animateY(page0, 2000, 0, 500);
  CustomAnimationUtils.animateY(page1, 3000, 0, 700);
}

private void animateOut() {

  int position = viewPager.getCurrentItem();
  
  View currentPage = adapter.getViewAt(position);
  CustomAnimationUtils.animateY(currentPage, 0, 2000, 400, new AnticipateInterpolator(1));
  
  if (position != 0) {
    View previousPage = adapter.getViewAt(position - 1);
    CustomAnimationUtils.animateY(previousPage, 0, 2000, 500);
  }
  
  if (position < adapter.getCount() - 1) {
    View nextPage = adapter.getViewAt(position + 1);
    CustomAnimationUtils.animateY(nextPage, 0, 2000, 500);
  }
  
}

SimpleAnimations.java

private void animateIn() {
  // start translationY - 2000
  // final translationY - 0
  // Duration - 1 sec
  CustomAnimationUtils.animateY(viewPager, 2000, 0, 1000);
}

private void animateOut() {
  // start translationY - 0
  // final translationY - 2000
  // Duration - 1 sec
  CustomAnimationUtils.animateY(viewPager, 0, 2000, 1000);
}