How should I set up NavController?

Question

enter image description here After I run it has been closed and cannot be displayed. Activity com.example.navigationdemo.MainActivity@1755f0c does not have a NavController set on 2131230916

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        NavController controller=Navigation.findNavController(this,R.id.fragmentContainerView);
        NavigationUI.setupActionBarWithNavController(this,controller);
    }

    @Override
    public boolean onSupportNavigateUp() {
        NavController controller=Navigation.findNavController(this,R.id.fragmentContainerView);
        return controller.navigateUp();
        //return super.onSupportNavigateUp();
    }