Android Jetpack Compose get Activity View Model from Fragment inside Composable

Question

I'm having an issue getting the activity view model from a fragment in a composable

private val birthdayViewModel: BirthdayViewModel by activityViewModels()

When I use viewModels() there is no issue

private val birthdayViewModel: BirthdayViewModel by viewModels()

Fetching the view model in composable like

val birthdayViewModel: BirthdayViewModel = viewModel()
val formItem by birthdayViewModel.birthdayFormItem.observeAsState()

The issue is that the form item errors to null when using activityViewModels but not when using viewModels

When I run in debug mode to check the value of the formItem I get this error message: "Cannot find local variable 'formItem' with type com.form.FormSpec$FormItem"

Could this be a gradle versioning issue?

Please help :)

are you using `Dagger Hilt` in your project? There is a way to provide the `ViewModel` in composable using `Dagger Hilt`? — mehul bisht, Jul 20 '21 at 03:04
do you have the dependency for using `activityViewModels` inside fragment? are you able to use `activityViewModels` without any `compile time` warnings/error? — mehul bisht, Jul 20 '21 at 18:35
Yes no issues I'm able to run the code and put the error I'm receiving when using activityViewModels in the fragment above in my question — Charles Woodson, Jul 20 '21 at 18:45

score 0 · Accepted Answer · answered Dec 06 '21 at 22:13

private val activityViewModel: ActivityViewModel by activityViewModels()
private val fragmentViewModel: FragmentViewModel by viewModels()

Composable(fragmentViewModel, activityViewModel)

The problem had to do with scopes. I was not passing the view models into my composable directly, but rather, was doing this in the composable constructor which didn't lead to both of my viewModels having a fragment scope.

Composable(
   fragmentViewModel: FragmentViewModel = viewModel(), 
   activityViewModel: ActivityViewModel = viewModel()
)

Android Jetpack Compose get Activity View Model from Fragment inside Composable

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