Enter animation demo: Re run LayoutAnimation

example.java

private void runLayoutAnimation(final RecyclerView recyclerView) {
    final Context context = recyclerView.getContext();
    final LayoutAnimationController controller =
            AnimationUtils.loadLayoutAnimation(context, R.anim.layout_animation_fall_down);

    recyclerView.setLayoutAnimation(controller);
    recyclerView.getAdapter().notifyDataSetChanged();
    recyclerView.scheduleLayoutAnimation();
}

Hi, the demo code at Github has actually been re-written in Kotlin as of Part 3 of the tutorial, so you could check out ListDemoFragment for some ideas:
https://github.com/patrick-elmquist/Demo-RecyclerViewEnterAnimation/blob/master/app/src/main/java/com/patrickiv/demo/enteranimationdemo/fragment/ListDemoFragment.kt#L70

Doing it now, I would probably add an extension function instead, like this:

private fun RecyclerView.runLayoutAnimation() {
    val animation = R.anim.layout_animation_fall_down
    layoutAnimation = AnimationUtils.loadLayoutAnimation(context, animation)
    adapter?.notifyDataSetChanged()
    scheduleLayoutAnimation()
}

and invoke it like recyclerView.runLayoutAnimation().

Gonna update the blog posts with Kotlin as well when I get the time.