How can i solve this exception with my navGraphs on orientat

Question

How can i solve this exception with my navGraphs on orientation change I do not get this error when top starting navGraph ```java lang IllegalStateException Restoring the Navigation back stack failed destination 1666506032 cannot be found from the current destination Destination 0xcf551cdb route=SettingsNavGraph```

Niklas Bolwede · Answer

Error ```Process com example testapp PID 4498 java lang IllegalStateException Restoring the Navigation back stack failed destination 1666506032 cannot be found from the current destination Destination 0xcf551cdb route=SettingsNavGraph at androidx navigation NavController onGraphCreated NavController kt 1125 at androidx navigation NavController setGraph NavController kt 1086 at androidx navigation NavController setGraph NavController kt 100 at androidx navigation compose NavHostKt NavHost NavHost kt 120 at androidx navigation compose NavHostKt NavHost NavHost kt 69 at com example testapp navigation NavGraphKt SetupNavGraph NavGraph kt 38 at com example testapp MainActivity$onCreate$1$1$1 invoke MainActivity kt 45 at com example testapp MainActivity$onCreate$1$1$1 invoke MainActivity kt 44 at androidx compose runtime internal ComposableLambdaImpl invoke ComposableLambda jvm kt 107 at androidx compose runtime internal ComposableLambdaImpl invoke ComposableLambda jvm kt 34 at androidx compose material SurfaceKt$Surface$6 invoke Surface kt 268 at androidx compose material SurfaceKt$Surface$6 invoke Surface kt 255 at androidx compose runtime internal ComposableLambdaImpl invoke ComposableLambda jvm kt 107 at androidx compose runtime internal ComposableLambdaImpl invoke ComposableLambda jvm kt 34 at androidx compose runtime CompositionLocalKt CompositionLocalProvider CompositionLocal kt 228 at androidx compose material SurfaceKt Surface F jzlyU Surface kt 252 at androidx compose material SurfaceKt Surface F jzlyU Surface kt 110 at com example testapp MainActivity$onCreate$1$1 invoke MainActivity kt 41 at com example testapp MainActivity$onCreate$1$1 invoke MainActivity kt 39 at androidx compose runtime internal ComposableLambdaImpl invoke ComposableLambda jvm kt 107 at androidx compose runtime internal ComposableLambdaImpl invoke ComposableLambda jvm kt 34 at com example testapp ui theme ThemeKt$AppTheme$2 invoke Theme kt 72 at com example testapp ui theme ThemeKt$AppTheme$2 invoke Theme kt 71 at androidx compose runtime internal ComposableLambdaImpl invoke ComposableLambda jvm kt 107 at androidx compose runtime internal ComposableLambdaImpl invoke ComposableLambda jvm kt 34 at androidx compose material MaterialTheme androidKt PlatformMaterialTheme MaterialTheme android kt 23 at androidx compose material MaterialThemeKt$MaterialTheme$1$1 invoke MaterialTheme kt 82 at androidx compose material MaterialThemeKt$MaterialTheme$1$1 invoke MaterialTheme kt 81 at androidx compose runtime internal ComposableLambdaImpl invoke ComposableLambda jvm kt 107 at androidx compose runtime internal ComposableLambdaImpl invoke ComposableLambda jvm kt 34 at androidx compose runtime CompositionLocalKt CompositionLocalProvider CompositionLocal kt 228 at androidx compose material TextKt ProvideTextStyle Text kt 265 at androidx compose material MaterialThemeKt$MaterialTheme$1 invoke MaterialTheme kt 81 at androidx compose material MaterialThemeKt$MaterialTheme$1 invoke MaterialTheme kt 80 at androidx compose runtime internal ComposableLambdaImpl invoke ComposableLambda jvm kt 107 at androidx compose runtime internal ComposableLambdaImpl invoke ComposableLambda jvm kt 34 at androidx compose runtime CompositionLocalKt CompositionLocalProvider CompositionLocal kt 228 at androidx compose material MaterialThemeKt MaterialTheme MaterialTheme kt 72 at com example testapp ui theme ThemeKt AppTheme Theme kt 67 at com example testapp MainActivity$onCreate$1 invoke MainActivity kt 39 at com example testapp MainActivity$onCreate$1 invoke MainActivity kt 38 at androidx compose runtime internal ComposableLambdaImpl invoke ComposableLambda jvm kt 107 at androidx compose runtime internal ComposableLambdaImpl invoke ComposableLambda jvm kt 34 at androidx compose ui platform ComposeView Content ComposeView android kt 410 ```

Niklas Bolwede · Answer

MainActivity kt ``` AndroidEntryPoint class MainActivity ComponentActivity private val appVM AppViewModel by viewModels override fun attachBaseContext base Context LocaleHelper setLocale base LocaleHelper getLanguage base super attachBaseContext LocaleHelper onAttach base override fun onCreate savedInstanceState Bundle super onCreate savedInstanceState setContent AppTheme darkTheme = false val navController = rememberNavController Surface modifier = Modifier fillMaxSize color = MaterialTheme colors background SetupNavGraph navController = navController appVM = appVM ```

Niklas Bolwede · Answer

NavGraph kt ``` Composable fun SetupNavGraph navController NavHostController appVM AppViewModel LaunchedEffect navigation appVM navigator sharedFlow onEach navController navigate it label launchIn this NavHost navController = navController startDestination = Navigator NavGraphRoot MainMenuNavGraph root route = Navigator NavGraphRoot NavHostRoot root mainMenuNavGraph appVM = appVM navController = navController settingsNavGraph appVM = appVM navController = navController ```

Niklas Bolwede · Answer

MainMenuNavGraph kt ```un NavGraphBuilder mainMenuNavGraph navController NavHostController appVM AppViewModel navigation startDestination = Navigator NavTarget MainMenu label route = Navigator NavGraphRoot MainMenuNavGraph root composable route = Navigator NavTarget MainMenu label MainMenuView appVM = appVM composable route = Navigator NavTarget Test label TestView appVM = appVM composable route = Navigator NavGraphRoot SettingsNavGraph root ```

Niklas Bolwede · Answer

SettingsNavGraph kt ```fun NavGraphBuilder settingsNavGraph navController NavHostController appVM AppViewModel navigation startDestination = Navigator NavTarget Settings label route = Navigator NavGraphRoot SettingsNavGraph root composable route = Navigator NavTarget Settings label val navGraphEntry = remember navController getBackStackEntry Navigator NavGraphRoot SettingsNavGraph root val graphViewModel = hiltViewModel lt SettingsViewModel gt navGraphEntry SettingsView appVM = appVM settingsVM = graphViewModel composable route = Navigator NavTarget UserSettings label val navGraphEntry = remember navController getBackStackEntry Navigator NavGraphRoot SettingsNavGraph root val graphViewModel = hiltViewModel lt SettingsViewModel gt navGraphEntry UserSettingsView appVM = appVM settingsVM = graphViewModel composable route = Navigator NavTarget LanguageSettings label val navGraphEntry = remember navController getBackStackEntry Navigator NavGraphRoot SettingsNavGraph root val graphViewModel = hiltViewModel lt SettingsViewModel gt navGraphEntry LanguageSettingsView appVM = appVM settingsVM = graphViewModel ```

Niklas Bolwede · Answer

Navigation kt ```class Navigator Inject constructor private val sharedFlow = MutableSharedFlow lt NavTarget gt extraBufferCapacity = 1 val sharedFlow = sharedFlow asSharedFlow fun navigateTo navTarget NavTarget sharedFlow tryEmit navTarget enum class NavTarget val label String MainMenu MainMenu Settings Settings Test Test UserSettings UserSettings LanguageSettings LanguageSettings enum class NavGraphRoot val root String NavHostRoot NavHostRoot MainMenuNavGraph MainMenuNavGraph SettingsNavGraph SettingsNavGraph ```

Niklas Bolwede · Answer

Dependencies ```implementation androidx core core ktx 1 7 0 implementation androidx compose ui ui $compose version implementation androidx compose material material $compose version implementation androidx compose ui ui tooling preview $compose version implementation androidx lifecycle lifecycle runtime ktx 2 4 1 implementation androidx activity activity compose 1 4 0 implementation com google accompanist accompanist systemuicontroller 0 23 1 implementation androidx navigation navigation compose 2 4 1 hilt implementation com google dagger hilt android 2 38 1 kapt com google dagger hilt compiler 2 38 1 implementation androidx hilt hilt navigation compose 1 0 0 implementation androidx hilt hilt lifecycle viewmodel 1 0 0 alpha03 ```