当我已经在Kotlin中使用了不同布局的setContentView()时，如何在onCreate()函数中将谷歌广告加

有没有办法在onCreate((中有两个不同的setContentView((调用，或者有没有办法将它们分开？我已经使用setContentView((来加载我的导航抽屉和工具栏，我不知道如何重组代码以适应它也包括广告。

我是android开发的新手，所以我可能会错过一些非常琐碎的东西。

class MainActivity : AppCompatActivity() {
private lateinit var appBarConfiguration: AppBarConfiguration
lateinit var mAdView : AdView
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val toolbar: Toolbar = findViewById(R.id.toolbar)
setSupportActionBar(toolbar)
//Initialize fab listener and SnackBar onClick
val fab: FloatingActionButton = findViewById(R.id.fab)
fab.setOnClickListener { view ->
Snackbar.make(view, "Here goes Nothing!", Snackbar.LENGTH_LONG)
.setAction("Action", null).show()
}
val drawerLayout: DrawerLayout = findViewById(R.id.drawer_layout)
val navView: NavigationView = findViewById(R.id.nav_view)
val navController = findNavController(R.id.nav_host_fragment)

appBarConfiguration = AppBarConfiguration(setOf(
R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow), drawerLayout)
setupActionBarWithNavController(navController, appBarConfiguration)
navView.setupWithNavController(navController)
navView.setCheckedItem(R.id.nav_home)

MobileAds.initialize(this) {}
val adRequest = AdRequest.Builder().build()

//this is the line where I get an error
setContentView(R.layout.fragment_home)

mAdView = findViewById(R.id.adViewHomeFragment)
mAdView.loadAd(adRequest)

}
/**This creates the options menu**/
override fun onCreateOptionsMenu(menu: Menu): Boolean {
// Inflate the menu; this adds items to the action bar if it is present.
menuInflater.inflate(R.menu.navigation_drawer, menu)
return true
}
override fun onSupportNavigateUp(): Boolean {
val navController = findNavController(R.id.nav_host_fragment)
return navController.navigateUp(appBarConfiguration) || super.onSupportNavigateUp()
}}

如果你对这个结构有什么问题或我如何改进它有任何建议，我将不胜感激。