如何知道共享元素转换何时结束

Question

我在活动之间使用Shared Element Transitions。过渡效果很好，但我想知道共享元素过渡何时结束，以便显示其他内容。

我尝试在要转换到的活动中使用 SharedElementCallback 中的 onSharedElementEnd，但在转换开始之前会调用它。

还有其他我可以监听的回调吗？

Answer 1

您是否尝试将动画侦听器绑定到onMapSharedElements 内的共享元素视图？ ViewCompat.animate(view) 会给你一个新的或缓存的ViewPropertyAnimator(Compat)，然后绑定动画监听器应该很简单。不过我没试过。

setEnterSharedElementCallback(new SharedElementCallback() {
            @Override
            public void onMapSharedElements(List<String> names, Map<String, View> sharedElements) {
                super.onMapSharedElements(names, sharedElements);
                View keySharedElementView = sharedElements.get("keySharedElement");
                if(keySharedElementView != null){
                    ViewCompat.animate(keySharedElementView).setListener(new ViewPropertyAnimatorListenerAdapter(){
                        @Override
                        public void onAnimationEnd(View view) {
                            super.onAnimationEnd(view);
                        }
                    });
                }
            }
        });

将Transition.Listener 添加到共享元素过渡效果如何？

 Transition sharedElementEnterTransition = getWindow().getSharedElementEnterTransition();
 sharedElementEnterTransition.addListener(new TransitionListenerAdapter() {
         @Override
          public void onTransitionEnd(android.support.transition.Transition transition) {
                    super.onTransitionEnd(transition);
           }
      });

Answer 2

请尝试onEnterAnimationComplete() 回调您的活动。

我敢打赌，这正是您要找的。​​p>

 @Override
    public void onEnterAnimationComplete() {
        super.onEnterAnimationComplete();

    //your code 
    }

Answer 3

这是我在片段中所做的：

Transition sharedElementEnterTransition = getActivity().getWindow().getSharedElementEnterTransition();
    sharedElementEnterTransition.addListener(new Transition.TransitionListener() {
        @Override
        public void onTransitionStart(Transition transition) {

        }

        @Override
        public void onTransitionEnd(Transition transition) {

        }

        @Override
        public void onTransitionCancel(Transition transition) {

        }

        @Override
        public void onTransitionPause(Transition transition) {

        }

        @Override
        public void onTransitionResume(Transition transition) {

        }
    });

Answer 4

尝试在 Fragment A 而不是 B 上添加 TransitionListener。并使用android.support.transition.Transition

片段 A

            val anim = DetailsTransition()
            anim.addListener(object : android.support.transition.Transition.TransitionListener
            {
                override fun onTransitionEnd(transition: android.support.transition.Transition) {
                }

                override fun onTransitionResume(transition: android.support.transition.Transition) {
                }

                override fun onTransitionPause(transition: android.support.transition.Transition) {
                }

                override fun onTransitionCancel(transition: android.support.transition.Transition) {
                }

                override fun onTransitionStart(transition: android.support.transition.Transition) {
                }

            })

Answer 5

我在 Kotlin 中使用导航组件努力做到这一点，但设法让它与它一起工作

override fun onCreateView(
    inflater: LayoutInflater, container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    setAndPostponeEnterAnimation()
    _binding = PokemonDetailFragmentBinding.inflate(inflater, container, false)
    setInsets()
    handleNavigationArgs()
    return binding.root
}

private fun setAndPostponeEnterAnimation() {
    postponeEnterTransition()
    sharedElementEnterTransition = TransitionInflater.from(context)
        .inflateTransition(R.transition.shared_element_transition)
    addSharedElementListener()
}

private fun addSharedElementListener() {
    (sharedElementEnterTransition as TransitionSet).addListener((object :
        TransitionListenerAdapter() {
        override fun onTransitionEnd(transition: Transition) {
            super.onTransitionEnd(transition)
            createRevealAnimation()
        }
    }))
}

所以我可以在开始新动画之前等待共享过渡完成