android mvp架构 浅尝辄止

为什么是浅尝辄止呢?应为google正在酝酿mvvm框架如databiding,所以有必要等一等

对于android mvp架构,实在mvc 上面演化而来,回顾一下android mvc:

View：对应于布局文件xml

model: 模型javabean

control:Activity或者fragment

稍微有过开发经验的人都知道,activity也承担了大部分view的角色，activity在control控制层时 有时候一个activity的代码量可能超过1000行,逻辑混乱，不易维护,担任的任务太重

这时候mvp就是这样演变出来 将view和activity相对隔离:用链接者presenter 他的作用就是负责view和model之间的交互,这样view和model不直接交互,这样相对更加自由

实例:

典型的javaBean 

package com.xuan.androidmvp.bean;

/**
 * @author xuanyouwu
 * @email [email protected]
 * @time 2016-04-20 10:37
 */
public class User {

    private String name;
    private int age;

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public User() {
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

对模型的操作的接口声明:

package com.xuan.androidmvp.model;

import com.xuan.androidmvp.bean.User;

/**
 * @author xuanyouwu
 * @email [email protected]
 * @time 2016-04-20 11:05
 */
public interface IUserModel {

    void setName(String name);

    void setAge(int age);

    User getUserInfo(int id);

    void setId(int id);

    int getId();
}

对模型接口声明的实现

package com.xuan.androidmvp.model.imp;

import com.xuan.androidmvp.bean.User;
import com.xuan.androidmvp.model.IUserModel;

/**
 * @author xuanyouwu
 * @email [email protected]
 * @time 2016-04-20 11:09
 */
public class UserModel implements IUserModel {
    @Override
    public void setName(String name) {

    }

    @Override
    public void setAge(int age) {

    }

    @Override
    public User getUserInfo(int id) {

        // 从存储中获取
        // return null;
        return new User("张三", 26);
    }

    @Override
    public void setId(int id) {

    }

    @Override
    public int getId() {
        return 0;
    }
}

现在就轮到连接器或者主持人吧

package com.xuan.androidmvp.presenter;

import com.xuan.androidmvp.bean.User;
import com.xuan.androidmvp.model.IUserModel;
import com.xuan.androidmvp.model.imp.UserModel;
import com.xuan.androidmvp.view.IUserView;

/**
 * @author xuanyouwu
 * @email [email protected]
 * @time 2016-04-20 11:02
 */
public class UserParesenter {

    private IUserView userView;
    private IUserModel userModel;

    public UserParesenter(IUserView userView) {
        this.userView = userView;
        this.userModel = new UserModel();
    }

    public void saveUser(int id, String name, int age) {
        this.userModel.setId(id);
        this.userModel.setName(name);
        this.userModel.setAge(age);
    }


    public void loadUser(int id) {
        User userInfo = userModel.getUserInfo(id);
        userView.setName(userInfo.getName());
        userView.setAge(userInfo.getAge());
    }


}
 
  
UI:Activity:
 
  




    

        

        

        


        

        

        
    


 
  
 
  
 
  
 
  
package com.xuan.androidmvp;

import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import com.xuan.androidmvp.presenter.UserParesenter;
import com.xuan.androidmvp.view.IUserView;

public class MainActivity extends AppCompatActivity implements IUserView {


    UserParesenter paresenter;
    EditText et_name, et_age;
    TextView tv_name, tv_age;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        et_name = (EditText) findViewById(R.id.et_name);
        et_age = (EditText) findViewById(R.id.et_age);
        tv_name = (TextView) findViewById(R.id.tv_name);
        tv_age = (TextView) findViewById(R.id.tv_age);
        findViewById(R.id.bt_ok).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int uId = (int) SystemClock.elapsedRealtime();
                paresenter.saveUser(uId, getName(), getAge());
                paresenter.loadUser(uId);
            }
        });
        paresenter = new UserParesenter(this);
    }

    @Override
    public String getName() {
        return et_name.getText().toString();
    }

    @Override
    public int getAge() {
        return Integer.valueOf(et_age.getText().toString());
    }

    @Override
    public void setName(String name) {
        tv_name.setText(name);
    }

    @Override
    public void setAge(int age) {
        tv_age.setText(Integer.toString(age));
    }
}