class MainActivity : AppCompatActivity() {

    private lateinit var navController: NavController

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val navHostFragment = supportFragmentManager.findFragmentById(
            R.id.nav_host_container
        ) as NavHostFragment
        navController = navHostFragment.navController

        // Установка navigation view
        val navigationRailView = findViewById<NavigationRailView>(R.id.navigation_rail)
        navigationRailView.setupWithNavController(navController)

    }


}

//предожение студии

private fun NavigationRailView.setupWithNavController(navController: NavController) {

}