Hello All,

# compose

[Deepak Gahlot]

Hello All,

[Deepak Gahlot]

I have a query regarding the coroutine in composable. I'm running an animation which rotates the icon 360 degree. What i'm doing is that in my ViewModel I have a method which which sets the value for the StateFlow of type boolean. Which i'm also collectingAsState in the composable. So I set it to True using a coroutine which is repeating after a delay of 10s. And i set it false from when the api is finished.

[Deepak Gahlot]

val isRotated = questionnaireViewModel.autoSaveStateFlow.collectAsState()
var currentDateTime = LocalDateTime.now()

    val angle: Float by animateFloatAsState(
        targetValue = if (isRotated.value) 360F else 0F,
        animationSpec = tween(
            durationMillis = 3000,
            easing = FastOutSlowInEasing
        )
    )

coroutineScope.launch(<http://Dispatchers.IO|Dispatchers.IO>) {
    //repeate Task Here
    delay(10000)
    questionnaireViewModel.setAutoSaveState(true)
    Log.i("👀mylog", "run: running animation")
}

[Deepak Gahlot]

this is the code snippet for the above

[Deepak Gahlot]

What i'm seeing is that coroutine function works fine for the first time but as the composable goes for recomposition because of the isRotated value change, coroutine runs multiple times

[Deepak Gahlot]

What i'm i missing ?

[Albert Chang]

Aren't you getting a lint error on coroutineScope.launch saying Calls to launch should happen inside a LaunchedEffect and not composition?

[Deepak Gahlot]

No i'm not getting a lint error. But i was originally using this inside a Launched Effect, but then i want this to keep running.

[Deepak Gahlot]

So ideally i thought it will be running once every time the composition recomposes, but it is running multiple times

[Albert Chang]

running once every time the composition recomposes

This is likely wrong. Why do you want this?

[Albert Chang]

Remember that recomposition can be triggered any times at any time. You shouldn't rely on when or how often it happens for correctness.

[Deepak Gahlot]

I want to have a service/task which runs every let's say 10 seconds. It basically saves the data entered by the user in the form that we are displaying.

[Albert Chang]

Then this should do.

LaunchedEffect(questionnaireViewModel) {
    while (true) {
        dalay(10000)
        questionnaireViewModel.setAutoSaveState(true)
    }
}

[Deepak Gahlot]

Okay i see. Thanks that works