Hi, Is it possible to share the same instance of a ViewModel between Compose screens?

# koin

[ynsok]

Hi,
Is it possible to share the same instance of a ViewModel between Compose screens?

[arnaud.giuliani]

ViewModel is backed by Activity or Fragment ... then yes

[Joel Crawford]

To add on what @arnaud.giuliani has said, yes you can with dependencies in Composable screens(ie. One Activity with Multiple Composable Screens)

[ynsok]

Are there any examples how it can be done?

[arnaud.giuliani]

for viewModel you can use koinViewModel function

[ynsok]

@arnaud.giuliani I tried it, and each time a new instance is created. Below is the code showing how I do it and the RegistrationViewModel is not shared between screens. What am I missing to achieve the result that this ViewModel will be the same between screens? 😄
Here is entry screen:

composable(EMAIL_ROUTE) {
    val vm: RegistrationViewModel = koinViewModel<RegistrationViewModel>()
    val state = vm.registrationState.collectAsState()

    EmailScreen(
        registrationState = state.value,
        onNavigateBack = onNavigateBack,
        onNextClicked = onNextClicked,
        onEmailValueChange = vm::onEmailEnter,
    )
}

And Here is my next screen that I'm navigating from EmailScreen

composable(PASSWORD_ROUTE) {
    val vm: RegistrationViewModel = koinViewModel<RegistrationViewModel>()
    val state = vm.registrationState.collectAsState()

    PasswordScreen(
        registrationState = state.value,
        onNavigateBack = onNavigateBack,
        onPasswordChange = vm::onPasswordEnter,
        onCreateAccount = onCreateAccount,
    )
}

[arnaud.giuliani]

yes a patch is available in 3.5.4-RC1 for that ViewModel recreation issue