MVP一路向北

官方Google的MVP

目录结构????

1.BaseView，BasePresenter

BasePresenter

所有的Presenter的初始化操作都放在start()方法中

public interface BasePresenter {
    void start();
}
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BaseView

public interface BaseView<T> {
    void setPresenter(T presenter);
}
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2.Contract--里面放的是契约接口，显示View和Presenter之间的方法

UserInfoContract

契约内部有两个接口，分别继承BaseView和BasePresenter

• View--实现 UI操作
• Presenter--实现 数据业务逻辑操作

public interface UserInfoContract {

    interface View extends BaseView<Presenter>{
        void showLoading();//展示加载框
        void dismissLoading();//取消加载框展示
        void showUserInfo(UserInfoModel userInfoModel);//将网络请求得到的用户信息回调
        String loadUserId();//假设接口请求需要一个userId
    }
    
    interface Presenter extends BasePresenter {
        void loadUserInfo();
    }
}
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3.M层：Model--set与get

public class UserInfoModel {
    private String name;
    private int age;
    private String address;
    public UserInfoModel(String name, int age, String address) {
        this.name = name;
        this.age = age;
        this.address = address;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
}
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4.P层：Presenter--实现 数据业务逻辑操作

• UserInfoPresenter 构造函数中传入UserInfoContract.View，并且调用view的setPresenter()方法

public class UserInfoPresenter implements UserInfoContract.Presenter {
    private UserInfoContract.View view;

    public UserInfoPresenter(UserInfoContract.View view) {
        this.view = view;
        view.setPresenter(this);
    }

    @Override
    public void loadUserInfo() {
        String userId = view.loadUserId();
        view.showLoading();//接口请求前显示loading
        //这里模拟接口请求回调-
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                //模拟接口返回的json，并转换为javaBean
                UserInfoModel userInfoModel = new UserInfoModel("小宝", 1, "杭州");
                view.showUserInfo(userInfoModel);
                view.dismissLoading();
            }
        }, 3000);
    }

    @Override
    public void start() {
        loadUserInfo();
    }
}
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5.V层：Activity中进行相关调用

• 所有的初始化操作都放在start()中，这样只要进入界面的时候调用start()方法就可以执行一系列初始化操作，这就相当于一种约定好的开发

public class UserInfoActivity extends AppCompatActivity implements UserInfoContract.View {
    private TextView tv_name;
    private TextView tv_age;
    private TextView tv_address;

    private UserInfoContract.Presenter presenter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv_name = (TextView) findViewById(R.id.tv_name);
        tv_age = (TextView) findViewById(R.id.tv_age);
        tv_address = (TextView) findViewById(R.id.tv_address);

        new UserInfoPresenter(this);
        presenter.start();
    }

    @Override
    public void showLoading() {
        Toast.makeText(this, "正在加载", Toast.LENGTH_LONG).show();
    }

    @Override
    public void dismissLoading() {
        Toast.makeText(this, "加载完成", Toast.LENGTH_LONG).show();
    }

    @Override
    public void showUserInfo(UserInfoModel userInfoModel) {
        if (userInfoModel != null) {
            tv_name.setText(userInfoModel.getName());
            tv_age.setText(String.valueOf(userInfoModel.getAge()));
            tv_address.setText(userInfoModel.getAddress());
        }
    }

    @Override
    public String loadUserId() {
        return "1000";//假设需要查询的用户信息的userId是1000
    }

    @Override
    public void setPresenter(UserInfoContract.Presenter presenter) {
        this.presenter = presenter;
    }
}
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2.Javabean -- 为了版本升级不被开发者打死

为了向后的兼容性

private int size;
public int getSize() { return size; }
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用户调用的永远是XXX.getSize()方法，无论方法里面包含的东西怎么变，用户都只管调用getSize()方法就能获取return 的内容

3.Model=Javabean+RxJava

现在手上写的项目Taskgo所使用的不算事真正意义上的MVP架构，为什么呢？因为将Model层应该进行的Rxjava的数据请求放在了Presenter中，真正的Model层应该是：Javabean+Rxjava网络请求，而Presenter中仅仅进行数据的判断（isDataTrue）等等