Custom “navigate up” behavior for certain fragment using Navigation component

Question

I want to add custom up navigation from fragment using Navigation component

In my build.gradle(app) I use androidx.appcompat:appcompat:1.1.0-

Answer 1

This set up also works and you won't need to override onSupportNavigateUp in your activity:

NavigationUI.setupWithNavController(toolbar, navController, appBarConfiguration)
toolbar.setNavigationOnClickListener {
    if (navController.currentDestination?.id == R.id.destinationOfInterest) {
        // Custom behavior here
    } else {
        NavigationUI.navigateUp(navController, configuration)
    }
}

I prefer to set up the Toolbar since it will handle automatically the up navigation and open/close a DrawerLayout if you have one.