MainActivity.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        ActivityMainBinding activityMainBinding= DataBindingUtil.setContentView(this,
                R.layout.activity_main);

        UserModel userModel=new UserModel("John");
        activityMainBinding.setUser(userModel);

    }
}