Question

我试图制作围绕圆形的图像视图的动画。以下是有效但不重复具有不同值的动画的代码：

public void runAnimation(){
    ImageView worldView=findViewById(R.id.imageView);
    int radius=worldView.getHeight()*30/70;
    int centerx = worldView.getLeft()+radius;
    int centery = worldView.getTop()+radius;
    //List<Animator> myList = new ArrayList<>();
    for (int i=0;i<360;i++) {

        /*---I calculate the points of the circle---*/
        int angle= (int) ((i * 2 * Math.PI) / 360);
        int x= (int) (centerx+(radius*Math.cos(angle)));
        int y= (int) (centery+(radius*Math.sin(angle)));

        /*---Here carView is the ImageView that need to turn around the worldView---*/
        ObjectAnimator animatorX =ObjectAnimator.ofFloat(carView, "x",x);
        ObjectAnimator animatorY =ObjectAnimator.ofFloat(carView, "y",y);
        ObjectAnimator animatorR =ObjectAnimator.ofFloat(carView, "rotation", i);

        animatorX.setDuration(500);
        animatorY.setDuration(500);
        animatorR.setDuration(500);

        AnimatorSet animatorSet=new AnimatorSet();
        animatorSet.playTogether(animatorX,animatorY,animatorR);
        animatorSet.start();
        //myList.add(animatorSet);
    }
    //AnimatorSet animatorSet=new AnimatorSet();
    //animatorSet.playSequentially(myList);
}

评论（＆＃34; //＆＃34;）在这里说明我想要创建的内容。提前感谢您的帮助。

Answer 1

您可以使用AnimatorSet为每个addListener(Animator.AnimatorListener listener)添加一个监听器。

for (int i=0;i<360;i++) {
    // ...skipped some lines here...
    AnimatorSet animatorSet=new AnimatorSet();
    animatorSet.playTogether(animatorX,animatorY,animatorR);
    myList.add(animatorSet);
    animatorSet.addListener(myListener);
}

其中 myListener 的定义如下：

private Animator.AnimatorListener myListener = new Animator.AnimatorListener(){

    @Override
    public void onAnimationStart(Animator animation){
        // no op
    }

    @Override
    public void onAnimationRepeat(Animator animation){
        // no op
    }

    @Override
    public void onAnimationCancel(Animator animation){
        // no op
    }

    @Override
    public void onAnimationEnd(Animator animation){
        startNextAnimation();
    }

};

除此之外，还需要一些变量private int counter;来迭代列表。在开始第一个动画之前，将其设置为零：

counter = 0;
myList.get(0).start();

开始下一个动画（如果还有一个动画）：

private void startNextAnimation(){
    counter++;
    if(counter == myList.size()){
        return;
    }
    myList.get(counter).start();
}

如何按顺序播放AnimatorSet列表？

1 个答案: