android Mvp简单实用

View 对应于Activity，负责View的绘制以及与用户交互
Model 依然是业务逻辑和实体模型
Presenter 负责完成View于Model间的交互

模拟客户端的登录操作，并实现登录成功与登录失败的回调。

1.bean文件

package com.mvp.bean;

public class UserBean {
    private String username;
    private String pwd;

    public UserBean() {
        super();
    }

    public UserBean(String username, String pwd) {
        super();
        this.username = username;
        this.pwd = pwd;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

}

2.Model

package com.mvp.model;

import com.mvp.listener.OnLoginListener;

public interface UserModel {
    // 登录
    void Login(String username, String pwd,OnLoginListener listener);
}

3.Model的实现，OnLoginListener是成功、失败的回调 

package com.mvp.model;

import android.annotation.SuppressLint;

import com.mvp.listener.OnLoginListener;

@SuppressLint("HandlerLeak")
public class UserModelImpl implements UserModel {
    /**
     * 实现业务操作
     */
    @Override
    public void Login(final String username, String pwd,
            final OnLoginListener listener) {
        new Thread() {

            @Override
            public void run() {
                if (username.equals("1")) {
                    listener.onSuccess();
                } else if (username.equals("2")) {
                    listener.onError();
                }
            }
        }.start();
    }
}

4.UserView

package com.mvp.view;

public interface UserView {

    String getUserName();

    String getPwd();

    void showDialog(String title);
}

5.Presenter

package com.mvp.presenter;

import android.os.Handler;

import com.mvp.listener.OnLoginListener;
import com.mvp.model.UserModel;
import com.mvp.model.UserModelImpl;
import com.mvp.view.UserView;

public class UserPresenter {
    private UserModel userModel;
    private UserView userView;
    private Handler mHandler = new Handler();

    public UserPresenter(UserView userView) {
        this.userView = userView;
        userModel = new UserModelImpl();
    }

    public void login(String username, String pwd) {
        userModel.Login(username, pwd, new OnLoginListener() {

            @Override
            public void onSuccess() {
                mHandler.post(new Runnable() {

                    @Override
                    public void run() {
                        userView.showDialog("success");
                    }
                });
            }

            @Override
            public void onError() {
                mHandler.post(new Runnable() {

                    @Override
                    public void run() {
                        userView.showDialog("error");
                    }
                });
            }
        });
    }
}

6.Activity文件

package com.mvp.view;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import com.mvp.presenter.UserPresenter;

public class MainActivity extends Activity implements UserView, OnClickListener {
    private TextView tv_show;
    private EditText et_username, et_pwd;
    private Button btn_save, btn_clear;
    private UserPresenter userPresenter;
    private Context context;

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

    private void initView() {
        userPresenter = new UserPresenter(this);
        tv_show = (TextView) findViewById(R.id.tv_show);
        et_username = (EditText) findViewById(R.id.et_username);
        et_pwd = (EditText) findViewById(R.id.et_pwd);
        findViewById(R.id.btn_save).setOnClickListener(this);
        findViewById(R.id.btn_clear).setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.btn_save:
            userPresenter.login(getUserName(), getPwd());
            break;
        case R.id.btn_clear:
            break;
        }
    }

    @Override
    public String getUserName() {
        return et_username.getText().toString();
    }

    @Override
    public String getPwd() {
        return et_pwd.getText().toString();
    }

    @Override
    public void showDialog(String title) {
        new AlertDialog.Builder(this).setTitle(title)
                .setPositiveButton("确定", null).setNegativeButton("取消", null)
                .show();
    }
}