What are the ways to replace the use of fragments in Single Activity architecture?

In Single Activity architecture, fragments are traditionally used to display different screens within a single Activity. However, there are alternative approaches:

1. Navigation Component with NavHostFragment — although this also uses fragments, the Navigation Component simplifies navigation and back stack management.

2. Jetpack Compose — a modern declarative UI framework from Google that allows building interfaces without fragments and XML layouts. In Compose, navigation can be managed through NavController, and screens are created as functions.

3. Using multiple Activities — although this contradicts the Single Activity idea, in some cases, logic can be split across multiple Activities.

4. View-based Navigation — managing the visibility and replacement of Views within a single Activity without using fragments.

Example of navigation in Jetpack Compose:

@Composable
fun NavGraph(navController: NavHostController) {
    NavHost(navController, startDestination = "home") {
        composable("home") { HomeScreen(navController) }
        composable("details") { DetailsScreen(navController) }
    }
}

Thus, modern approaches allow for abandoning fragments by using Compose or simpler View management.