Remove up button from action bar when navigating using BottomNavigationView with Android Navigation UI library

Question

I\'ve created a small app that has three fragments for top-level navigation through a BottomNavigationView. If you launch the app and click on a navigation button on the bottom

Answer 1

Starting with 1.0.0-alpha07 you can use AppBarConfiguration to configure that behaviour.

AppBarConfiguration has a Builder constructor so you can create a new Builder with a specific set of top level destinations, referenced by their id (this id is the one you set on your navigation layout).

Create new AppBarConfiguration:

val appBarConfiguration = AppBarConfiguration
            .Builder(
                    R.id.navigationHomeFragment,
                    R.id.navigationListFragment,
                    R.id.navigationProfileFragment)
            .build()

Then, instead of setupActionBarWithNavController(this, navController) you need to call setupActionBarWithNavController(this, navController, appBarConfiguration)

This is the right way to handle top navigation behaviours.