MainActivity.class (setData)

public class MainActivity extends AppCompatActivity {

    private ActivityMainBinding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        
        UserModel user = new UserModel();
        user.setFirstName("Jedsada");
        user.setLastName("Tiwongvorakul");
        user.setAge(22);
        
        binding.setData(user);
    }
}