compose-navigation-reimagined.kt

// 1. Create a destination
sealed class Destination : Parcelable { // parcelable so that it can be saved in a bundle.
  object First : Destination()
  data class Second(val name: String, val hobbies: List<String>) : Destination()
}

// 2. Setup the navigation
@Composable
fun MainScreen() {
  // Create a NavController
  val controller = rememberNavController<Destination>(
    startDestination = Destination.First
  )
  
  NavBackHandler(controller) // Very important, otherwise system back action will not pop the backstack.
  
  // Could be NavHost or etc.
  AnimatedNavHost(
    controller = controller,
    transitionSpec = ...
  ) { destination ->
    when(destination) {
      Destination.First -> { /* composable content */ }
      Destination.Second -> { /* composable content */ }
    }
  }
}