How to generate looping animation with ViewPropertyAnimator?

Question

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

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);

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.

Thanks in advance

You can use `CycleInterpolator`. See my answer [here](http://stackoverflow.com/a/40385244/2093236). — Dmide, Nov 02 '16 at 16:42
I think "this" would be what to use instead of listener, but yeah it'd probably just hold onto the memory and leak if that's what happened. Anyway I realize this is nearly 4 years old by now. — Stephen J, Mar 28 '17 at 19:36

score 8 · Accepted Answer · answered Apr 04 '13 at 17:13

Well, I am going to answer myself again.

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

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);
            }

Don't feel like this answers the question which specified ViewPropertyAnimator — Trevor, Apr 29 '19 at 00:48

score 3 · Answer 2 · answered Oct 07 '15 at 19:56

Not elegant way, but it works:

Runnable runnable = new Runnable() {
    @Override
    public void run() {
        // update newX
        v.animate().setDuration(animDuration).setInterpolator(newsInterpolator).x(newX).withEndAction(this).start(); 
    }
};

v.animate().setDuration(animDuration).setInterpolator(newsInterpolator).x(newX).withEndAction(runnable).start();

How to generate looping animation with ViewPropertyAnimator?

2 Answers2

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