如何使用AnimatorSet播放多个动画? [英] How to play multiple Animations using AnimatorSet?

问题描述

我正在使用 Sceneform 创建一个可播放动画的android应用.我正在尝试使用 AnimatorSet 顺序启动多个Animator.尝试播放两个动画时，代码可以完美运行，但是每当我添加第三个动画时，前两个动画就会播放，然后应用崩溃.

I'm using Sceneform to create an android app that plays animation. I'm trying to start multiple Animators sequentially using AnimatorSet. The code works perfectly when trying to play two animations, but whenever I add a 3rd animation, the first two animations play then the app crashes.

下面是一段代码:

    List<Animator> animatorList = new ArrayList<Animator>();

    AnimationData ad1 = JimRenderable.getAnimationData("Abm_09|A");

    Animator a = new ModelAnimator(ad1, JimRenderable);
    animatorList.add(a);

    AnimationData ad2 = JimRenderable.getAnimationData("Abm_09|B");

    a = new ModelAnimator(ad2, JimRenderable);
    animatorList.add(a);

    AnimationData ad3 = JimRenderable.getAnimationData("Abm_09|C");

    a = new ModelAnimator(ad3, JimRenderable);
    animatorList.add(a);

    AnimatorSet as= new AnimatorSet();
    as.playSequentially(animatorList);
    as.start();

我如何让它播放不止2个动画?

How can I let it play more than just 2 animations?

推荐答案

AnimatorSet 公共类(扩展了 Animator 类)提供了一种将动画分组在一起的机制，以使它们彼此相对运行.您可以设置动画在指定的延迟时间后同时，顺序或播放.

AnimatorSet public class, which extends Animator class, provides a mechanism to group animations together so that they run in relation to one another. You can set animations to play simultaneously, sequentially, or after a specified delay.

这是您的代码外观:

AnimatorSet bouncer = new AnimatorSet();

bouncer.play(bounceAnim).before(squashAnim1);

// THESE FOUR ANIMATIONS PLAY SIMULTANEOUSLY
bouncer.play(squashAnim1).with(squashAnim2);
bouncer.play(squashAnim1).with(stretchAnim1);
bouncer.play(squashAnim1).with(stretchAnim2);

bouncer.play(bounceBackAnim).after(stretchAnim2);

ValueAnimator fadeAnim = ObjectAnimator.ofFloat(newBall, "alpha", 1f, 0f);
fadeAnim.setDuration(250);
AnimatorSet animatorSet = new AnimatorSet();
animatorSet.play(bouncer).before(fadeAnim);

animatorSet.start();

在此代码中， squashAnim1 剪辑与 squashAnim2 ， stretchAnim1 和 stretchAnim2 同时播放.

这个示例说明了它的工作方式:我们设置了一个 AnimatorSet 进行播放:

And this example explains how it works: we set up an AnimatorSet to play:

• anim1 和 anim2 同时
• anim3 在 anim2 完成时播放，

• 和 anim4 在 anim3 完成时播放:

• anim1 and anim2 at the same time,
• anim3 to play when anim2 finishes,

• and anim4 to play when anim3 finishes:

AnimatorSet clips = new AnimatorSet();
clips.play(anim1).with(anim2);
clips.play(anim2).before(anim3);
clips.play(anim4).after(anim3);

此外，您可以使用动画侦听器.他们可以在动画播放期间收听重要事件.这是一个看起来像这样的代码:

Also, you might use Animation listeners. They can listen for important events during an animation's duration. Here's a code how it looks like:

ValueAnimator fadeAnim = ObjectAnimator.ofFloat(newBall, "alpha", 1f, 0f);
fadeAnim.setDuration(250);

fadeAnim.addListener(new AnimatorListenerAdapter() {
    public void onAnimationEnd(Animator animation) {
        balls.remove(((ObjectAnimator)animation).getTarget());
    }
}

希望这会有所帮助.

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