Как вызвать список при нажатии на кнопку? Код внутри Часть fun onNavigationItemSelected Непонятно как искать по id

abstract class MainActivity : AppCompatActivity(),NavigationView.OnNavigationItemSelectedListener {
 
 
 
private lateinit var appBarConfiguration: AppBarConfiguration
 
 
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
 
////////////////////////////////////
// СПИСОК
/////////////////////////////////////
val array=resources.getStringArray(R.array.fish_array)//1
 
val adapter=ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, ArrayList<String>(Arrays.asList(*array)))//2
 
listView.adapter=adapter//3
///////////////////////////////////////////////
 
 
val toolbar: Toolbar = findViewById(R.id.toolbar)
setSupportActionBar(toolbar)
 
 
val drawerLayout: DrawerLayout = findViewById(R.id.drawer_layout)
val navView: NavigationView = findViewById(R.id.nav_view)
val 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_gallery, R.id.nav_slideshow,
R.id.nav_tools, R.id.nav_share, R.id.nav_send
), drawerLayout
)
setupActionBarWithNavController(navController, appBarConfiguration)
navView.setupWithNavController(navController)
}
 
override fun onCreateOptionsMenu(menu: Menu): Boolean {
// Inflate the menu; this adds items to the action bar if it is present.
menuInflater.inflate(R.menu.main, menu)
return true
}
 
override fun onSupportNavigateUp(): Boolean {
val navController = findNavController(R.id.nav_host_fragment)
return navController.navigateUp(appBarConfiguration) || super.onSupportNavigateUp()
}
 
override fun onNavigationItemSelected(p0: MenuItem): Boolean {
 
var id:Int=0
if (id==R.id.id_fish){
val array=resources.getStringArray(R.array.fish_array)
 
}
else {
val array=resources.getStringArray(R.array.na_array)
}
TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
}
 
}

var id:Int=menuItem.itemId
        if (id==R.id.id_fish){
           val array=resources.getStringArray(R.array.fish_array)

override fun onNavigationItemSelected(menuItem: MenuItem): Boolean {
        var id:Int=menuItem.itemId
        if (id==R.id.id_fish){
            resources.getStringArray(R.array.fish_array)
        }
        return true
    }