IssueTracker

Component used: Navigation, androidx.navigation:navigation-compose Version used: 2.4.0-alpha06 Devices/Android versions reproduced on: 11

When using NavHost composable in a Fragment, the start destination is not displayed. This only happens when using the composable in a Fragment with 2.4.0-alpha06. It works fine in 2.4.0-alpha05 or when using NavHost in an Activity.

class SampleFragment: Fragment() {
  override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        return ComposeView(requireContext()).apply {
            setContent {
               Column(Modifier.fillMaxSize().padding(56.dp)) {
                    Text("This is displayed")
                    val navController = rememberNavController()
                    NavHost(navController = navController, "start" ) {
                        composable("start") {
                            Column {
                                Text("Start destination is not displayed")
                                Button(onClick = {
                                    navController.navigate("end")
                                } ) {
                                    Text("next")
                                }
                            }
                        }
                        composable("end") {
                            Text("End destination")
                        }
                    }
                }
            }
      }
}

It looks like the NavHost composable is not recomposed when the NavBackstackEntry state is changed. So the initial backStackEntry is null, then lifecycle is updated but NavHost isn't recomposed so the destination content is not displayed.