public class MainActivity extends BaseActivity<ActivityMainBinding, MainPresenter> implements MainView {

    @Override protected MainPresenter initPresenter() {
        return new MainPresenter(this);
    }

    @Override protected ActivityMainBinding contentView() {
        return DataBindingUtil.setContentView(this, R.layout.activity_main);
    }

    @Override protected void onCreated() {
        //do anything in here! or with android:onClick="doClick" and create doClick(view) method in this place.
        view.btnTest.onClickListener(v -> {
            Toast("Hi!");
        });
    }
    
}

class MainPresenter extends BasePresenter<MainView> {

    MainPresenter(MainView view) {
        super.attachView(view);
    }

    void example() {
        subscribe(service.getHome()
                .compose(new MainScheduler<>())
                .subscribe(res -> {
                    if (res.isSuccessful()) {
                        view.onSuccess(res.body());
                    }
                }, err -> {
                    view.onError(err.getMessage());
                })
        );
    }

}