Simple BottomBar navigation in Jetpack Compose

MainActivity.kt

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContent {
            ComposeTypeSafeNavigationTheme {
                val navController = rememberNavController()
                
                val navBackStackEntry by navController.currentBackStackEntryAsState()
                val currentRoute = navBackStackEntry?.destination?.route

                Scaffold(
                    bottomBar = {
                        BottomAppBar {
                            BottomNavigation.entries
                                .forEachIndexed { index, navigationItem ->

                                    val isSelected by remember(currentRoute) {
                                        ...
                                    }

                                    NavigationBarItem(
                                        selected = isSelected,
                                        label = { Text(navigationItem.label) },
                                        icon = {
                                            Icon(
                                                navigationItem.icon,
                                                contentDescription = navigationItem.label
                                            )
                                        },
                                        onClick = {
                                            navController.navigate(navigationItem.route)
                                        }
                                    )
                                }
                        }
                    }
                ) {
                    NavHost(
                        modifier = Modifier
                            .fillMaxSize()
                            .padding(it),
                        navController = navController,
                        startDestination = Destinations.HomeGraph
                    ) {
                        navigation<Destinations.HomeGraph>(
                            startDestination = Destinations.Home,
                        ) {

                            composable<Destinations.Home> {
                                Greeting("HomeScreen")
                            }

                            composable<Destinations.Search> {
                                Greeting("Search")
                            }

                            composable<Destinations.Profile> { backStackEntry ->
                                Greeting("Profile")
                            }
                        }
                    }
                }
            }
        }
    }
}

Navigation.kt

sealed class Destinations {

    @Serializable
    data object HomeGraph: Destinations()
    
    @Serializable
    data object Home : Destinations()

    @Serializable
    data class Search(val searchText: String? = null) : Destinations()

    @Serializable
    data object Profile : Destinations()
}

enum class BottomNavigation(val label: String, val icon: ImageVector, val route: Destinations) {
    HOME("Home", Icons.Filled.Home, Destinations.Home),
    SEARCH("Search", Icons.Filled.Search, Destinations.Search()),
    PROFILE("Profile", Icons.Filled.AccountCircle, Destinations.Profile);
}