android Studio在新弹出的activity使用底部导航栏

android Studio在新弹出的activity使用底部导航栏（注意不是主Activity），在点击按钮切换到新activity时，退回到桌面，代码如下
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

    binding = FragmentnewActivity.inflate(getLayoutInflater());
    setContentView(binding.getRoot());

    BottomNavigationView navView = findViewById(R.id.nav_view);
    // Passing each menu ID as a set of Ids because each
    // menu should be considered as top level destinations.
    AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(
            R.id.nav_Fragment1, R.id.nav_Fragment2,R.id.nav_Fragment3)
            .build();

    NavController navController = Navigation.findNavController(this, R.id.nav_newview_main);
    NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
    NavigationUI.setupWithNavController(binding.navView, navController);

}

个人感觉是binding的赋值和setContenView这里出了问题，但是不知道为什么