Floating action button start up animation

Question

I have been looking around online for a while, but I can't seem to find it anywhere. I have a floating action button that I have working already. It shows up and is clickable etc, but at this point has nothing wired up to it. Before I go any further I want to know how to make it animate on startup.

On the material design page for FAB it shows like a sprout type animation where it comes from the correct location, but animates to its intended size. Found here.

Any info is appreciated.

Answer 1

You want to use AnimationUtils here. Here is an easy tutorial: Android Animations

Answer 2

You can take a look at the Behavior class inside of FloatingActionButton. For example this is how the enter animation is implemented:

private void animateIn(FloatingActionButton button) {
    button.setVisibility(0);
    if(VERSION.SDK_INT >= 14) {
        ViewCompat.animate(button).scaleX(1.0F).scaleY(1.0F).alpha(1.0F).setInterpolator(AnimationUtils.FAST_OUT_SLOW_IN_INTERPOLATOR).withLayer().setListener((ViewPropertyAnimatorListener)null).start();
    } else {
        Animation anim = android.view.animation.AnimationUtils.loadAnimation(button.getContext(), anim.fab_in);
        anim.setDuration(200L);
        anim.setInterpolator(AnimationUtils.FAST_OUT_SLOW_IN_INTERPOLATOR);
        button.startAnimation(anim);
    }
}