What’s the proper way to show an one time even? For example a toast from a

SharedFlow

?

You should use a side-effect composable for that.

LaunchedEffect

is perfect for this. See this example.

My concern is the “collecting” part. So I should make an if to see if the flow has some value and then launch the toast? I see the scaffold have some snaback state, but what about something else that doesn’t have this state ready for you?

You can add a

SnackbarHost()

outside of a

Scaffold

as well.

you can pass any key you want to launched effect, but not sure how null key for instance would work with recompositions. I got one snippet for vm in mvi architecture that collects effects in compose:

LaunchedEffect(key1 = "PackagesStartFormEffects") {
                viewModel.effect.collect { effect ->
                    val message = when (effect) {
                        PackagesStartFormContract.Effect.FormConfirmed -> {
                            "Form confirmed!"
                        }
                        is PackagesStartFormContract.Effect.UnknownError -> {
                            effect.message ?: "Unknown error."
                        }
                    }
                    snackbarHostState.showSnackbar(
                        message = message,
                        actionLabel = label,
                        duration = SnackbarDuration.Long
                    )
                }
            }

but it feels like ""PackagesStartFormEffects" is not elegant solution to fulfill the key1 parameter requirement. I think that passing null would do same thing.

I guess in this last document I found what as was doing wrong. Instead of

collectAsState()

the example just

collect{}

and do what’s needed