首先看图：
上图是MVP，下图是MVC
MVP和MVC的区别，在于以前的View层不仅要和model层交互，还要和controller层交互。而在mvp中，view层只和presenter层交互，而model层也和presenter交互，presenter构成了view层和model层的桥梁，也解耦了view层和model层。这一点很关键。我认为，这也是mvp的本质：解耦view层和model层，让view层和model层通过presenter层进行通信。换个说法就是让诸如网络请求，数据库读写的逻辑，从activity中剥离出来。activit只负责页面的展示，不关心model层的逻辑。
简单的MVP模式，3个class 和 1个interface 就可以实现
各文件主要功能如下：
1个interface：定义activity 要实现的回调方法
3个class：1个Model层定义文件 1个业务逻辑 Presenter文件 1个Activity文件
列举实现代码
1）interface定义文件
MainCallBack.java
package com.jack.basemvp.basemvp;/** * 定义要实现的回调方法 */public interface MainCallBack { void getMessage(String message); void error();}2）Model层文件
MainModel.java
package com.jack.basemvp.basemvp;import okhttp3.Call;import okhttp3.OkHttpClient;import okhttp3.Request;/** * 定Model */public class MainModel { public Call getData(String url) { OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder().url(url).build(); return client.newCall(request); }}3)Presenter层文件
MainPresenter.java
package com.jack.basemvp.basemvp;import android.support.annotation.NonNull;import java.io.IOException;import okhttp3.Call;import okhttp3.Callback;import okhttp3.Response;/** * 定义业务逻辑 Presenter */public class MainPresenter { private MainCallBack callBack; private MainModel model; public MainPresenter(MainCallBack callBack) { this.callBack = callBack; model=new MainModel(); } public void getUrlData(String url){ model.getData(url).enqueue(new Callback() { @Override public void onFailure(@NonNull Call call, @NonNull IOException e) { callBack.error(); } @Override public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException { callBack.getMessage(response.body().string()); } }); }}4）activity调用
SimpleMvpActivity.java
package com.jack.basemvp.activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import com.jack.basemvp.R;import com.jack.basemvp.basemvp.MainCallBack;import com.jack.basemvp.basemvp.MainPresenter;import java.lang.ref.WeakReference;public class SimpleMvpActivity extends AppCompatActivity implements View.OnClickListener,MainCallBack{ public EditText simple_et; Button btn_submit_req; TextView simple_tv; private MainPresenter presenter; private MyHandler handler; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_simple_mvp); simple_et = (EditText) findViewById(R.id.simple_et); btn_submit_req = (Button) findViewById(R.id.btn_submit_req); simple_tv = (TextView) findViewById(R.id.simple_tv); handler = new MyHandler(this); presenter = new MainPresenter(this); btn_submit_req.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()){ case R.id.btn_submit_req: String url = simple_et.getText().toString(); presenter.getUrlData(url); break; } } @Override public void getMessage(String message) { Message msg = handler.obtainMessage(0, message); handler.sendMessage(msg); } @Override public void error() { Message msg = handler.obtainMessage(1, "error"); handler.sendMessage(msg); } private static class MyHandler extends Handler { private WeakReference<SimpleMvpActivity> reference; private MyHandler(SimpleMvpActivity activity) { reference = new WeakReference<>(activity); } @Override public void handleMessage(Message msg) { super.handleMessage(msg); SimpleMvpActivity activity = reference.get(); switch (msg.what) { case 0: activity.simple_tv.setText(msg.obj.toString()); break; case 1: activity.simple_tv.setText(msg.obj.toString()); break; } } }}具体代码见Github：
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本文原文地址：https://www.cnblogs.com/wukong1688/p/10794023.html
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