ActionBarPopupWindow.java 文件源码

private void startChildAnimation(View child) {
    if (animationEnabled) {
        AnimatorSet animatorSet = new AnimatorSet();
        animatorSet.playTogether(
                ObjectAnimator.ofFloat(child, "alpha", 0.0f, 1.0f),
                ObjectAnimator.ofFloat(child, "translationY", AndroidUtilities.dp(showedFromBotton ? 6 : -6), 0));
        animatorSet.setDuration(180);
        animatorSet.setInterpolator(decelerateInterpolator);
        animatorSet.start();
    }
}