Hello, I have the following code in my project (I ...

# compose

[henrikhorbovyi]

Hello,
I have the following code in my project (I saw it in JetNews repo)

@Model
object AppNavigator {
    var currentScreen: Screen = Screen.Home()
}

/**
 * Temporary solution pending navigation support.
 */
fun navigateTo(destination: Screen) {
    AppNavigator.currentScreen = destination
}

But now I'm using dev12, and we know that @Model is deprecated. How do you guys would fix it?

I've tryied:

object AppNavigator {
    var currentScreen: MutableState<Screen> = state { Screen.Home() }
}

But it does not work, states must be called inside composables

[Kazemihabib1996]

var currentScreen by mutableStateOf(Screen.Home())

[Kazemihabib1996]

There are some problems with auto Import in the recent versions of AndroidStudio If the Idea throws error: Type 'MutableState<TypeVariable(T)>' has no method 'getValue(ThemeState, KProperty<*>)' and thus it cannot serve as a delegate

Import getValue and SetValue manually.

import androidx.compose.getValue
import androidx.compose.setValue

[Val Salamakha]

@Kazemihabib1996 it does not work.

[Kazemihabib1996]

@Val Salamakha throws error?

[Val Salamakha]

yes

[Kazemihabib1996]

what's the error?

[Val Salamakha]

import androidx.compose.getValue
import androidx.compose.setValue

The abovementioned is not active and they are shown as unused .

[Kazemihabib1996]

I had experiences like that but it builds with out problem, it's the kotlin plugins bug I think

[Val Salamakha]

Finally it works as Screen.Home

var currentScreen by mutableStateOf( Screen.Home )

Anyway thanks to @Kazemihabib1996

[Val Salamakha]

@henrikhorbovyi The last version of Jetnews is working when you change code in the file Status.kt to the following :

import androidx.compose.getValue
import androidx.compose.setValueobject                                              ...                                                 object JetnewsStatus {
    var currentScreen by mutableStateOf( Screen.Home as Screen )
    val favorites by mutableStateOf(ModelList<String>())
    val selectedTopics by mutableStateOf(ModelList<String>())

}

other code without changes.

[Adam Powell]

You don't need to use mutableStateOf around ModelLists

[nickbutcher]

Jetnews is updated to dev12 on the develop branch. We still need to merge this back

https://github.com/android/compose-samples/blob/develop/JetNews/app/src/main/java/com/example/jetnews/ui/Status.kt#L33

[henrikhorbovyi]

@Kazemihabib1996 it worked \o/ Thanks

[henrikhorbovyi]

I've tried this before but, I saw an error, but now it worked when I passed a <T>

[henrikhorbovyi]

... mutableStateOf<Screen>(...)

[henrikhorbovyi]

I think was exactly the "import error" that you mentioned @Kazemihabib1996

[henrikhorbovyi]

And @nickbutcher, I didn't see this pull request and I created the issue for @Model 😄

[henrikhorbovyi]

Thanks to share it

[nickbutcher]

No worries, thanks for filling it. We should maybe make the develop branch more prominent as it's the most useful.