[Android Studio] เรื่องการนำเมนู Login ไปไว้ใน Navigation

public class MenuLogin extends Fragment{}

public class MenuLogin extends ActionBarActivity{

    Button bLogin;
    EditText etUsername, etPassword ;
    View rootview;
    @Nullable
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        rootview = inflater.inflate(R.layout.activity_menu_login,container,false);

        etUsername = (EditText) findViewById(R.id.etUsername);
        etPassword = (EditText) findViewById(R.id.etPassword);
        bLogin = (Button) findViewById(R.id.bLogin);

        return rootview;
    }
}