Repeat AnimatorSet

Question

Is there a simple way to repeat a Android AnimatorSet (infinite)? Can I set a AnimationListener and restart the AnimatorSet by calling

Answer 1

How about this?

@Override
public void onAnimationEnd(Animator animation) {
    if (!mCanceled) {
        animation.reset();  //<- added.
        animation.start();
    }
}

Answer 2

Set Infinite repeat count and restart / reverse repeat mode to all child animations

animatorSet.childAnimations.forEach {
            val animator  = it as ObjectAnimator
            animator.repeatCount = ObjectAnimator.INFINITE
            animator.repeatMode = ObjectAnimator.RESTART / REVERSE
}

Answer 3

There is an answer for the first two questions

Is there a simple way to repeat a Android AnimatorSet (infinite)? Can I set a AnimationListener and restart the animatorSet by calling start() again?

Yes, there is:

mAnimationSet.addListener(new AnimatorListenerAdapter() {

  private boolean mCanceled;

  @Override
  public void onAnimationStart(Animator animation) {
    mCanceled = false;
  }

  @Override
  public void onAnimationCancel(Animator animation) {
    mCanceled = true;
  }

  @Override
  public void onAnimationEnd(Animator animation) {
    if (!mCanceled) {
      animation.start();
    }
  }

});
mAnimationSet.start();

The answer for the third question, is no. The first animation will be repeated and after all repetitions the succeeding animation will be started.

Answer 4

No, you can't repeat AnimatorSet, you can only repeat of a single ObjectAnimator/ ValueAnimator

But you can use PropertyValuesHolder, so that you can make an ObjectAnimator from a set of PropertyValuesHolder

here's example

val translateY = PropertyValuesHolder.ofFloat(View.TRANSLATION_Y, -100f, 100f)
val alpha = PropertyValuesHolder.ofFloat(View.ALPHA, 0.3f, 0.7f)
val scaleX = PropertyValuesHolder.ofFloat(View.SCALE_X, 0.8f, 1.2f)
val scaleY = PropertyValuesHolder.ofFloat(View.SCALE_Y, 0.8f, 1.2f)
// and more

ObjectAnimator.ofPropertyValuesHolder(myView, translateY, alpha, scaleX, scaleY).apply {
    interpolator = AccelerateDecelerateInterpolator()
    // duration of each animation
    duration = 500L
    // repeat infinite count (you can put n times)
    repeatCount = ValueAnimator.INFINITE
    // reverse animation after finish
    repeatMode = ValueAnimator.REVERSE
    // start animation
    start()
}

Answer 5

Out of my head - animation framework is source of pain, especially if you want to support 2.x. I usually had problems with sets trying to do anythig more complexKeep track of with AnimationListener kind-of "player". I keep track on which animation I play (like int etc) and then on onAnimationEnd I start another that should be in sequence. That way I can easily "script" my sequence, and do not bother broken framework.

Answer 6

So, none of the above options are appropriate.

If you use:

  @Override
  public void onAnimationEnd(Animator animation) {
    if (!mCanceled) {
      animation.start();
    }
  }

you will end up getting stackOverFlow exception sometimes.

The best thing is to do something like:

Thread t = new Thread(new Runnable() {
            @Override
            public void run() {
                while (true && getActivity() != null) {
                    getActivity().runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            set3.start();
                        }
                    });
                    SystemClock.sleep(1200);
                }
            }
        });
        t.start();