AnimatorUtils.java 文件源码

static void openMenu(ViewGroup viewGroup, int openIndex, AnimatorListenerAdapter endListener) {
    List<Animator> animList = new ArrayList<>();

    for (int i = viewGroup.getChildCount() - 1; i >= 0; i--) {
        if (openIndex == i) {
            animList.add(createOpenItemAnimator(viewGroup.getChildAt(i)));
        } else {
            animList.add(createStayHideItemAnimator(viewGroup.getChildAt(i)));
        }
    }
    AnimatorSet animSet = new AnimatorSet();
    animSet.setDuration(ANIM_DURATION);
    animSet.setInterpolator(new AnticipateInterpolator());
    animSet.playTogether(animList);
    animSet.addListener(endListener);
    animSet.start();
}