I was wondering if it is possible to use MutableSt...

# compose

[Brett May]

I was wondering if it is possible to use MutableStateOf with a Delegates.observable ? I want to know inside my ViewModel() subclass when my MutableState variable changes. I am looking for an equivalent of the following SwiftUI code:

@Published var meInformation : Me? {
        didSet {
           print("MeInformation changed: \(meInformation)")
        }
    }

This doesn’t compile for me: (unresolved reference: by)

class AuthenticatedUser(val context: Context) : ViewModel() { 
    var meInformation: MutableState<MeInformation?> = mutableStateOf(null) by Delegates.observable("<no name>") {
        prop, old, new ->
        println("$old -> $new")
    }
}

I’m not sure if it matters (being new to Kotlin), but meInformation is a @Serializable object

[divid3d]

I think MutableStateFlow and StateFlow are what might you looking for.

https://developer.android.com/kotlin/flow/stateflow-and-sharedflow

[Adam Powell]

Can you say a bit more about the specific use case? There are a few different tools or patterns available depending on the data flow you're looking to create

[Brett May]

Sure, externally to AuthenticatedUser I want the UI to redraw when the meInformation updates (info about the current user, including purchase info), internally when meInformation is updated I want this class to write this information to the sharedPreferences.

[Brett May]

divid3d I think you are correct, looking at that link seems to fit with what I want to do.