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ap...@google.com
Oh I forgot to mention that I thought it might be connected to this issue:
ap...@google.com
Please provide a minimal sample project along with the minimal steps to recreate the issue in the project.
ap...@google.com
Sorry for the delay. I got a working example here:
I poked into it a little bit and it seems to be connected to
Steps to reproduce:
- Navigate from Second Fragment to Child nav graph (with non-nullable parameters).
- Navigate to Third fragment using SafeArgs and the app crashes.
Crash log:
Process: cz.dels.issues, PID: 1743
java.lang.NullPointerException: null cannot be cast to non-null type kotlin.Long
at androidx.navigation.NavType$Companion$LongType$1.get(NavType.kt:352)
at androidx.navigation.NavType$Companion$LongType$1.get(NavType.kt:342)
at androidx.navigation.NavArgument.verify(NavArgument.kt:76)
at androidx.navigation.NavDestination.addInDefaultArgs(NavDestination.kt:502)
at androidx.navigation.NavController.addEntryToBackStack(NavController.kt:1865)
at androidx.navigation.NavController.addEntryToBackStack$default(NavController.kt:1813)
at androidx.navigation.NavController$navigate$4.invoke(NavController.kt:1721)
at androidx.navigation.NavController$navigate$4.invoke(NavController.kt:1719)
at androidx.navigation.NavController$NavControllerNavigatorState.push(NavController.kt:287)
at androidx.navigation.fragment.FragmentNavigator.navigate(FragmentNavigator.kt:246)
at androidx.navigation.fragment.FragmentNavigator.navigate(FragmentNavigator.kt:162)
at androidx.navigation.NavController.navigateInternal(NavController.kt:260)
at androidx.navigation.NavController.navigate(NavController.kt:1719)
at androidx.navigation.NavController.navigate(NavController.kt:1545)
at androidx.navigation.NavController.navigate(NavController.kt:1472)
at androidx.navigation.NavController.navigate(NavController.kt:1930)
at cz.dels.issues.SecondFragment.onViewCreated$lambda-0(SecondFragment.kt:38)
at cz.dels.issues.SecondFragment.$r8$lambda$XDYnOS_cYrafiNQ5rcCu1WCn0IE(Unknown Source:0)
at cz.dels.issues.SecondFragment$$ExternalSyntheticLambda0.onClick(Unknown Source:2)
Note: If in step 2 SaveArgs is not used then navigation works correctly. More information is here:
jb...@google.com
Ups a typo: Navigate from Second First Fragment to Child nav graph (with non-nullable parameters).
Note: sorry for the spam but I am not able to edit my own comment.
Description
The visibleEntries stateFlow that is currently offered as an experimental API on NavController is populated based on the current lifecycle state of the entry. This means that it considers the hostLifecycleState of the entry when determining whether entries should be part of the list.
Because of this, when the navController is first created, depending on the lifecycle state when you call setGraph, it is possible for the visibleEntries to be empty until after the first navigate call. Also, if the hostLifecycle state is forced down, as in the case of using nested NavHost with different NavControllers in navigation-compose, entries are immediately removed from the list of visible entries although they might still be visible because of animations.
We should visible visible entries so that is always contains any entry that actually should be considered visible.