如何生成循环动画与ViewPropertyAnimator？ [英] How to generate looping animation with ViewPropertyAnimator?

问题描述

我想建立TextViews的动画，这只是完成后重演。

I want to build an animation of TextViews, which repeats itself just after completion.

对于每个视图我想动画，我用的是下面这段code

For each View I want to animate, I use the following piece of code

final float oldX = v.getX();
final float newX = v.getX() - (float)totalWidth;
final AnimatorListenerAdapter listener = new AnimatorListenerAdapter() {
    @Override
    public void onAnimationEnd(Animator animation) {
        v.setX(oldX);
        animFinished = true;

        //This line won't compile
        //v.animate().setDuration(animDuration).setInterpolator(newsInterpolator)
        //    .setListener(listener).x(newX);
    }
};

v.animate().setDuration(animDuration).setInterpolator(newsInterpolator)
    .setListener(listener).x(newX); 

我试图把最后一块code到onAnimationEnd，但因为它认为该对象监听器未初始化的Java将无法编译。此外，我不认为这种递归动画调用是一个很好的解决方案，这是它来到我想到的第一件事。我怀疑是有实现循环属性动画一个简单而完善的方式，但我没能找到它，所以我把这里寻求帮助。

I tried to place the last piece of code into the onAnimationEnd, but Java will not compile since it considers the object listener as not initialized. Moreover, I don't think that this "recursive" animation invocation is a good solution, it was the first thing which came to my mind. I am suspicious that there is a simple and sound way to implement looping property animation, but I failed to locate it, so I turned here for help.

在此先感谢

推荐答案

嗯，我会再回答我。

TranslateAnimation类有关于重复动画的方法，所以我用，而不是ViewPropertyAnimator吧。

TranslateAnimation class has methods about repeating the animation, so I used it instead of ViewPropertyAnimator.

下面code似乎工作：

The following code seems to work:

            long duration = 1000* ((long)totalWidth / newsScrollSpeed);
            System.out.println("totalWidth="+totalWidth);
            TranslateAnimation  anim = new TranslateAnimation(0,-totalWidth,0,0);
            anim.setInterpolator(linearInterpolator);
            anim.setDuration(duration);
            anim.setRepeatCount(TranslateAnimation.INFINITE);
            anim.setRepeatMode(TranslateAnimation.RESTART);

            for(i=0;i<this.getChildCount();i++)
            {
                View v = this.getChildAt(i);

                if(v.getId() == R.id.yuruyen_yazi)
                {
                    continue;
                }

                v.startAnimation(anim);
            }

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