Jetpack compose how to recompose when coming to foreground

Question

I'd like to make status bar hidden and I've managed to do it like so using the accompanist library:

val systemUiController = rememberSystemUiController()
systemUiController.isStatusBarVisible = false

The issue is that when the app goes to background and comes to foreground, this piece of code is not run and therefore the status bar is shown again. How can I fix that?

Thanks.

Answer 1

You can use OnLifecycleEvent from this answer.

val systemUiController = rememberSystemUiController()
OnLifecycleEvent { _, event ->
    when (event) {
        Lifecycle.Event.ON_RESUME,
        Lifecycle.Event.ON_START,
        -> {
            systemUiController.isStatusBarVisible = false
        }
        else -> Unit
    }
}

OnLifecycleEvent:

@Composable
fun OnLifecycleEvent(onEvent: (owner: LifecycleOwner, event: Lifecycle.Event) -> Unit) {
    val eventHandler = rememberUpdatedState(onEvent)
    val lifecycleOwner = rememberUpdatedState(LocalLifecycleOwner.current)

    DisposableEffect(lifecycleOwner.value) {
        val lifecycle = lifecycleOwner.value.lifecycle
        val observer = LifecycleEventObserver { owner, event ->
            eventHandler.value(owner, event)
        }

        lifecycle.addObserver(observer)
        onDispose {
            lifecycle.removeObserver(observer)
        }
    }
}