动画结束后我该怎么做? [英] How do I do something when an animation finishes?

问题描述

我有一个 ImageView，用于通过 AnimationDrawable 显示进度.当我想显示我的进度微调器时，我这样做:

I have an ImageView that I use to show progress via an AnimationDrawable. When I want to show my progress spinner, I do this:

animDrawable.start();
ObjectAnimator.ofFloat(view, "alpha", 1.0f).setDuration(300).start();

当我想隐藏微调器时，我这样做:

When I want to hide the spinner, I do this:

ObjectAnimator.ofFloat(view, "alpha", 0.0f).setDuration(300).start();
animDrawable.stop();

然而，这具有动画立即停止的效果.我希望它仅在 ObjectAnimator 完全淡化到 0.0 alpha 后停止.有没有办法可以按照AnimationCompleted"回调的方式设置一些东西?

However, this has the effect that the animation stops immediately. I would like it to stop only after the ObjectAnimator has completely faded to 0.0 alpha. Is there a way I can setup something along the lines of an "AnimationCompleted" callback?

推荐答案

更现代的方法是使用 ViewPropertyAnimator:

The more modern way of doing this is to use the ViewPropertyAnimator:

view.animate()
    .alpha(0f)
    .withEndAction(new Runnable() {
      @Override
      public void run() {
        // Do something.
      }
    })
    .start();

或者，如果您使用的是 RetroLambda:

Or, if you're using RetroLambda:

view.animate()
    .alpha(0f)
    .withEndAction(() -> {
      // Do something.
    })
    .start();

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