I want to do navigation with Scaffold and BottomNavigation in Jetpack Compose. They are in the MainPage. But when I click the content in the MainPage and navigate to DetailPage, the BottomNavigation also exist, like the image:
How can I hide the BottomNavigation in the DetailPage?
You need to specify which screens you want to show and which screens you dont want; Otherwise it will show to all the screens inside Scaffold's body (which you have bottomBar). The code below was from my app.
Create a state which observes any destination changes on the navController
Inside when you can put any screens that you want to show navigationBar else just set currentScreen to NoBottomBar
@Composable private fun NavController.currentScreen(): State<MainSubScreen> { val currentScreen = remember { mutableStateOf<MainSubScreen>(MainSubScreen.Home) } DisposableEffect(key1 = this) { val listener = NavController.OnDestinationChangedListener { _, destination, _ -> when { destination.hierarchy.any { it.route == MainSubScreen.Home.route } -> { currentScreen.value = MainSubScreen.Home } else -> currentScreen.value = MainSubScreen.NoBottomBar } } addOnDestinationChangedListener(listener) } return currentScreen } On the Scaffold where you put ur bottomBar
so you can check if currentScreen was NoBottomBar if it was, don't show it
// initialized currentScreeen above val currentScreen by navController.currentScreen() Scaffold( bottomBar = { if (currentScreen != MainSubScreen.NoBottomBar) { MainBottomNavigation() } else Unit } ) { // Your screen } 
It depends on where you put your NavHost. If it wraps your Scaffold then you navigate that Composable covers entire screen
NavHost( navController = navController, startDestination = "start_destination" ) { composable(route = "start_destination") { -> Scaffold(){...} } } If NavHost is inside content: @Composable (PaddingValues) -> Unit, when you navigate while your TopAbbpar, Tabs or BottomNavigation remains on screen
I fond a way to do it.
Try to use ViewModle to controll the visibility of BottomNavigation, show it when enter to MainPage and hide it when leave MainPage
// ViewModel class VM: ViewModel() { private val _state: MutableLiveData<Boolean> = MutableLiveData(true) val state: LiveData<Boolean> get() = _state fun setState(status: Boolean) { _state.postValue(status) } } // MainPage @Compose MainPage(vm: VM) { LaunchedEffect(key1 = true) { vm.setState(true) } DisposableEffect(key1 = true) { onDispose { vm.setState(false) } } } // page contains Scaffold @Composable fun Greeting(vm: VM) { // State of BottomNavigation`s visibility val state = remember { mutableStateOf<Boolean>(true) } // read the BottomNavigation`s visibility from ViewModel and send to State vm.state.observeAsState().value?.let { state.value = it } Scaffold(bottomBar = { // show / hide BottomNavigation controlled by State state.takeIf { it.value }?.let { BottomNavigation { list.forEachIndexed { index, label -> BottomNavigationItem( label = { Text(text = label) }, selected = index == selectedItem.value, onClick = { selectedItem.value = index }, icon = { Icon( painter = painterResource(id = R.drawable.ic_launcher_foreground), contentDescription = null ) }) } } } }) { NavHost(navController = navController, startDestination = "one") { composable(route = "one") { PageList(navController, vm) } composable(route = "detail") { PageDetail(vm) } } } } If you want ot hide the BottomNavigation quickly, you can hide BottomNavigation before Navigation.