ScrollAwareFABBehavior.java 文件源码

private void animateIn(FloatingActionButton button) {
    button.setVisibility(View.VISIBLE);
    if (Build.VERSION.SDK_INT >= 14) {
        ViewCompat.animate(button)
                .translationY(0)
                .setInterpolator(INTERPOLATOR)
                .withLayer()
                .setListener(null)
                .start();
    } else {
        Animation anim = AnimationUtils.loadAnimation(button.getContext(),
                android.support.design.R.anim.design_fab_in);
        anim.setDuration(200L);
        anim.setInterpolator(INTERPOLATOR);
        button.startAnimation(anim);
    }
}