FragmentManagerImpl.java 文件源码

static boolean modifiesAlpha(Animation anim) {
    if (anim instanceof AlphaAnimation) {
        return true;
    }
    if (anim instanceof AnimationSet) {
        List<Animation> anims = ((AnimationSet) anim).getAnimations();
        for (int i = 0; i < anims.size(); i++) {
            if (anims.get(i) instanceof AlphaAnimation) {
                return true;
            }
        }
    }
    return false;
}