public class BaseApp extends FDApp {
    @Override
    protected void config() {
	// 此处可以进行您项目其它库的初始化
    }
}

public abstract class BaseActivity<V extends FDView, P extends FDPresenter<V>> extends FDActivity<V, P> {

}
public abstract class BaseFragment<V extends FDView, P extends FDPresenter<V>> extends FDFragment<V, P> {

}

public interface TestContract {
    interface View extends FDView {
        void getUserName(String username);
    }

    abstract class Presenter extends FDPresenter<View> {
        public abstract void getUserName();
    }
}

public class TestPresenter extends TestContract.Presenter {
    @Override
    public void getUserName() {
        // 步骤二
        // 这里进行具体的业务
        // ...
        // 简单模拟获取到的用户名是“小飞”
        String username = "小飞";
        // 回调结果给View层
        mView.getUserName(username);
    }
}

public class TestActivity extends FDActivity<TestContract.View, TestContract.Presenter> implements TestContract.View {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test);
        // 步骤一
        // 调用Presenter层，获取用户名
        mPresenter.getUserName();		
    }

    @Override
    protected TestContract.Presenter initPresenter() {
        return new TestPresenter();
    }

    @Override
    public void getUserName(String username) {
        // 步骤三
        // 显示获取的用户名
        Toast.makeText(this, "用户名是" + username, Toast.LENGTH_SHORT).show();
    }
}