Dynamic ActionBar title from a Fragment using AndroidX Navigation

Question

I am using the new Navigation component from Android Jetpack.

The root Activity setup is quite simple:

override fun onCreate(savedInstanceState: Bund         


        

Answer 1

Well, now the Navigation UI supports this feature. Now the ActionBar title changes dynamically. You just have to setup the ActionBar with the NavController.

private lateinit var appBarConfiguration: AppBarConfiguration

private lateinit var navController: NavController

override fun onCreate(savedInstanceState: Bundle?) {
    preferedTheme()
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    setSupportActionBar(toolbar)
    navController = findNavController(R.id.nav_controller_fragment)
    appBarConfiguration = AppBarConfiguration(navController.graph)
    setupActionBarWithNavController(navController, appBarConfiguration)
}

And set action bar label in nav graph:

And now its also support Navigate Up:

override fun onSupportNavigateUp(): Boolean {
    return navController.navigateUp(appBarConfiguration) || super.onSupportNavigateUp()
}