onNavigationItemSelected not calling when item is selected

Question

I am adding footer-view in navigation drawer using following code -

Answer 1

Dear this worked for me the item R.id.nav_logout i needed finish activity and not instance a fragment:

private lateinit var appBarConfiguration: AppBarConfiguration
var drawerLayout: DrawerLayout? = null
var navView: NavigationView? = null
var navController: NavController? = null

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_customer_main)
    val toolbar: Toolbar = findViewById(R.id.toolbar)
    setSupportActionBar(toolbar)

    val fab: FloatingActionButton = findViewById(R.id.fab)
    fab.setOnClickListener { view ->
        Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                .setAction("Action", null).show()
    }

    drawerLayout = findViewById(R.id.drawer_layout)
    navView = findViewById(R.id.nav_view)
    navController = findNavController(R.id.nav_host_fragment)
    // Passing each menu ID as a set of Ids because each
    // menu should be considered as top level destinations.
    appBarConfiguration = AppBarConfiguration(setOf(
            R.id.nav_home, R.id.nav_service_requests), drawerLayout)
    setupActionBarWithNavController(navController!!, appBarConfiguration)
    navView!!.setupWithNavController(navController!!)
    navView!!.setNavigationItemSelectedListener(this)
}

override fun onSupportNavigateUp(): Boolean {
    val navController = findNavController(R.id.nav_host_fragment)
    return navController.navigateUp(appBarConfiguration) || super.onSupportNavigateUp()
}

override fun onNavigationItemSelected(menuItem: MenuItem): Boolean {
    menuItem.isChecked = true
    drawerLayout!!.closeDrawers()
    when (menuItem.itemId) {
        R.id.nav_logout -> {
            Prefs.putBoolean("flagLogin", false)
            val intent = Intent(this@CustomerMainActivity, LoginActivity::class.java)
            startActivity(intent)
            finish()
            return true
        }
    }
    if( navController!!.currentDestination!!.id != menuItem.itemId)
        navController!!.navigate(menuItem.itemId)
    return true
}

Answer 2

You attach setNavigationItemSelectedListener with NavigationView which will override during default configuration of setupWithNavController. So attach your listener after configuring default settings. Check below code.

nv_top.setupWithNavController(navController)
drawer_menu_body.setNavigationItemSelectedListener(this)

Update: To work with default navigation you have to handle like below:

override fun onNavigationItemSelected(menu: MenuItem): Boolean {
    val handled = NavigationUI.onNavDestinationSelected(menu, navController)

    if (!handled) {
        // handle other navigation other than default
    }

    drawer_layout.closeDrawer(GravityCompat.START)

    return handled
}