Is it possible to create a short lived android vie...

# android-architecture

[Arun Joseph]

Is it possible to create a short lived android viewmodel within another larger viewmodel? For example, i have a view model for a view, I would like to create a new view model that lives from start button to stop button within the view.

[Tim Oltjenbruns]

ViewModel is a pattern, and your ViewModels don’t have to inherit from androidx.lifecycle.ViewModel to follow the pattern

[Tim Oltjenbruns]

if your problem is retaining the object for the correct scope, that may be a problem for Dependency Injection

[Arun Joseph]

Its like i want to have an extra scope for the inner view model.

[Tim Oltjenbruns]

what if when you clicked that button, your “parent” view model updated a flow or livedata to contain this “child” viewmodel. (but the child would not inherit androidx viewmodel)

[Tim Oltjenbruns]

And then that child viewmodel had it’s own functions and flows/livedata

[Tim Oltjenbruns]

would that solve your issue?

[Tim Oltjenbruns]

Another option would be to make this child view a Fragment and give it a viewmodel

[Arun Joseph]

Yes, i expect child view model to have independent state(live data) and methods. I would like to have parent & child view model to observe each others state(or livedata, i use compose) and send events to each other. Or both can communicate to data layers.

[FunkyMuse]

View model inside another view model seems like a place for bugs and bad ideas, you can maybe have a shared object between those two view models that can tie their communication

[Arun Joseph]

Its not exactly view model inside view model. But a big view or composable having a larger view model and a short lived view model from button press to button press

[FunkyMuse]

That short lived view model can be that object

[Arun Joseph]

I would like to take advantage of the scope, actions and state concept of view model for my special mode which exists between the button toggles.