Hi, im trying to learn coroutines/Flow I want to subscribe my `viewModel.state` flow in android Ac...

# coroutines

[ursus]

Hi, im trying to learn coroutines/Flow

I want to subscribe my viewModel.state flow in android Activity, between onStart and onStop
I do that, and notice that after having activity.onStop called, next activity.onStart doesn't start listening to the flow
So I conclude scopes are not reusable

But this is android reality and I need that. I need equivalent of rx compositeDisposable.clear()

Is the only solution to have abstraction over the scope which will create new scope instances?

[flosch]

One possible solution: https://github.com/floschu/loco/blob/97ce8499f9139602fdd6243b6a96592d1d6e0c32/loco-core/src/main/kotlin/at/florianschuster/loco/activity.kt#L61

[Ian Lake]

Sounds like you should be using lifecycleScope.launchWhenStarted

[Ian Lake]

As that stops collect callbacks when you get stopped and resumes callbacks when you get started again: https://developer.android.com/topic/libraries/architecture/coroutines#suspend

[ursus]

sure, but I'd like to know the underlying issue, so solving it without lifecycleScope

[Ian Lake]

Cancel means permanently cancelled, yes. That's why those methods are there to handle this correctly