k0siara

NavHost(...) {
    composable("home") {
        Home(
            onClick = {
                 val example = Example("1", "Example")
                 val json = Uri.encode(Gson().toJson(example))
                 navController.navigate("details/$json")
            }
        )
    }

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class ExampleNavType : NavType<Example>(isNullableAllowed = false) {
    override fun get(bundle: Bundle, key: String): Example? {
        return bundle.getParcelable(key)
    }

    override fun parseValue(value: String): Example {
        return Gson().fromJson(value, Example::class.java)
    }

    override fun put(bundle: Bundle, key: String, value: Example) {

k0siara

@Parcelize
data class Example(val id: String, val name: String) : Parcelable

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composable(
    "profile?userId={userId}",
    arguments = listOf(navArgument("userId") { defaultValue = "me" })
) { backStackEntry ->
    Profile(backStackEntry.arguments?.getString("userId")) { friendUserId ->
        navController.navigate("profile?userId=$friendUserId")
    }
}

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NavHost(startDestination = "profile/{userId}") {
    ...
    composable(
        "profile/{userId}",
        arguments = listOf(navArgument("userId") { type = NavType.StringType })
    ) {...}
}

k0siara

class FirstScreenViewModel(
    private val navigator: Navigator
) : ViewModel {

  ...
  
  fun navigateExample() {
      navigator.navigate(NavigationActions.FirstScreen.firstScreenToSecondScreen())
  }
  

k0siara

import androidx.compose.runtime.Composable
import androidx.compose.runtime.State
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.remember
import androidx.lifecycle.Lifecycle
import androidx.lifecycle.LifecycleOwner
import androidx.lifecycle.flowWithLifecycle
import kotlinx.coroutines.flow.Flow

@Composable

k0siara

@Composable
fun NavHostExample(
   navController: NavHostController = rememberNavController(),
   navigator: Navigator = get(),
) {
   val lifecycleOwner = LocalLifecycleOwner.current
   val navigatorState by navigator.navActions.asLifecycleAwareState(
        lifecycleOwner = lifecycleOwner,
        initialState = null
   )

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val appModule = module {
    single<Navigator> {
        ComposeCustomNavigator()
    }

    viewModel {
        FirstSceenViewModel(
            navigator = get()
        )
    }

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interface Navigator {
    val navActions: StateFlow<NavigationAction?>
    fun navigate(navAction: NavigationAction?)
}

class ComposeCustomNavigator : Navigator {
    private val _navActions: MutableStateFlow<NavigationAction?> by lazy {
        MutableStateFlow(null)
    }
    override val navActions = _navActions.asStateFlow()