Repeat an Animation with a delay between each loop on Android-CodePudding

I have an animation to wiggle a button. I want it repeat infinitely with a delay between each loop.

I tried using doOnEnd with a startDelay and it worked well, but eventually caused a StackOverflowError.

Using doOnEnd with startDelay (works but causes SO error):

val animator = ObjectAnimator
    .ofFloat(premiumButton, "translationX", 0F, 25F, -25F, 25F, -25F, 15F, -15F, 6F, -6F, 0F)
    .setDuration(2000L)

animator.doOnEnd {
    it.startDelay = 10000
    it.start()
}

animator.start()

Next I tried using an AnimatorSet but my animations are different durations and so it just jiggles continuously without a delay between jiggles no matter what configuration/properties I use (since the jiggle is the shorter animation).

Using AnimatorSet (didn't work because animations are different durations):

val animatorJiggle = ObjectAnimator
    .ofFloat(myButton, "translationX", 0F, 25F, -25F, 25F, -25F, 15F, -15F, 6F, -6F, 0F)
    .setDuration(2000)
    .apply { repeatCount = ObjectAnimator.INFINITE }

val animatorDelay = ObjectAnimator
    .ofFloat(myButton, "translationX", 0F)
    .setDuration(10000)
    .apply { repeatCount = ObjectAnimator.INFINITE }

AnimatorSet().apply {
    playSequentially(animatorJiggle, animatorDelay)
    // repeat(ObjectAnimator.INFINITE) { }
    start()
}

How do I get an animation to loop with a delay between each loop without using the first solution (since it causes an SO error)?

CodePudding user response：

I found a solution using the the pause and resume functions of the ObjectAnimator with coroutines. Basically, I pause the animations, wait for the delay, then resume. I don't know if this will cause a StackOverflow error, but I don't think so.

Repeat animation with a delay:

private fun ObjectAnimator.repeatWithDelay(delay: Long, lifecycleScope: LifecycleCoroutineScope) {
    repeatCount = ObjectAnimator.INFINITE
    doOnRepeat {
        pause() // pause animator
        lifecycleScope.launchWhenResumed {
            delay(delay)
            resume() // resume animator
        }
    }
}

Using it (inside an activity):

val jiggleAnimator = ObjectAnimator
    .ofFloat(myButton, "translationX", 0F, 25F, -25F, 25F, -25F, 15F, -15F, 6F, -6F, 0F)
    .setDuration(2000)

jiggleAnimator.repeatWithDelay(10000, [email protected])
jiggleAnimator.start()

You could also use a timer or a runnable, but I chose to use coroutines because it's safer (you can make sure you're not trying access the UI or variables of an activity after its been killed).

CodePudding user response：

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