If I subscribe to a flow from a `ViewModel` using ...

# android

[dave08]

If I subscribe to a flow from a ViewModel using launchIn on a `Fragment`'s lifecycleScope can I assume that the UI won't get updated if the activity is detached or the state is paused? And if not, then do I have to register all these things on onResume and cancel them on onPause or check before updating each time?

[Hakob Astvacatryan]

It depends on what kind of coroutine you launch. There are launchWhenCreated, launchWhenStarted, launchWhenResumed builder functions that you can use to launch coroutines. They all lifecycle aware.

[dave08]

This flow needs to send updates to the ui, so if I use one of those on oncreated, it will delay the starting of the collection, but won't stop it at pause and won't resume it at resume, unless i'm understandong wrong?

[Hakob Astvacatryan]

if you want get events when your view resumed you can use this launchWhenResumed in case of start launchWhenStarted

[Hakob Astvacatryan]

and it will pause listening when view is not resumed or is not started accordingly

[dave08]

But how do you do that for `Flow`s?

someFlow().launchIn(...?)
// Or do I need to do this:
lifecycleScope.launchWhenResumed {
    someFlow.collect { }
}

[Hakob Astvacatryan]

Yes the second one

[Hakob Astvacatryan]

and StateFlow instead of Flow i guess

[dave08]

Oh well, the first one looks much better..., I guess we'll need to change that, thanks!