?Android? MVP 架構下? 最簡單的 代碼實現

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首先看圖：

上圖是MVP，下圖是MVC

MVP和MVC的區別，在于以前的View層不僅要和model層交互，還要和controller層交互。而在mvp中，view層只和presenter層交互，而model層也和presenter交互，presenter構成了view層和model層的橋梁，也解耦了view層和model層。這一點很關鍵。我認為，這也是mvp的本質：

解耦view層和model層，讓view層和model層通過presenter層進行通信。換個說法就是讓諸如網絡請求，數據庫讀寫的邏輯，從activity中剝離出來。activit只負責頁面的展示，不關心model層的邏輯。

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簡單的MVP模式，3個class 和 1個interface 就可以實現

各文件主要功能如下：

1個interface：定義activity 要實現的回調方法

3個class：1個Model層定義文件 +? 1個業務邏輯 Presenter文件? + 1個Activity文件

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列舉實現代碼

1）interface定義文件

MainCallBack.java

package com.jack.basemvp.basemvp;/*** 定義要實現的回調方法*/
public interface MainCallBack {void getMessage(String message);void error();
}

2）Model層文件

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層文件

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;/*** 定義業務邏輯 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() {@Overridepublic void onFailure(@NonNull Call call, @NonNull IOException e) {callBack.error();}@Overridepublic void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {callBack.getMessage(response.body().string());}});}}

4）activity調用

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;@Overrideprotected 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);}@Overridepublic void onClick(View v) {switch (v.getId()){case R.id.btn_submit_req:String url = simple_et.getText().toString();presenter.getUrlData(url);break;}}@Overridepublic void getMessage(String message) {Message msg = handler.obtainMessage(0, message);handler.sendMessage(msg);}@Overridepublic 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);}@Overridepublic 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;}}}
}

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具體代碼見Github：

https://github.com/wukong1688

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本博客地址： wukong1688

本文原文地址：https://www.cnblogs.com/wukong1688/p/10794023.html

轉載請著名出處！謝謝~~

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轉載于:https://www.cnblogs.com/wukong1688/p/10794023.html

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