How can I repeat a property animation?

Question

I'm doing an animation of bubbles on the screen, but the bubbles stop after finishing the animation time. How do I repeat the animation or make it infinite?

bub.animate();
bub.animate().x(x2).y(y2);
bub.animate().setDuration(animationTime);       
bub.animate().setListener(new AnimatorListenerAdapter() {

    @Override
    public void onAnimationStart(Animator animation) {
        animators.add(animation); 
    } 

    @Override
    public void onAnimationRepeat(Animator animation) {
    }

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

Answer 1

Here is an example in Kotlin with a simple way to repeat the animation by recursively calling it in withEndAction

Example

private var animationCount = 0

private fun gyrate() {
    val scale = if (animationCount++ % 2 == 0) 0.92f else 1f
    animate().scaleX(scale).scaleY(scale).setDuration(725).withEndAction(::gyrate)
}

This repeatedly animates the size of a view to get smaller, return to normal, get smaller, return to normal, etc. This is a pretty simple pattern to repeat whatever animation you'd like.

Answer 2

You can use CycleInterpolator. For example, like this:

    int durationMs = 60000;
    int cycleDurationMs = 1000;
    view.setAlpha(0f);
    view.animate().alpha(1f)
            .setInterpolator(new CycleInterpolator(durationMs / cycleDurationMs))
            .setDuration(durationMs)
            .start();