简述

MVC：即Model，View，Controller

代码流程：

MVP: 即Model，View，Presenter；是从经典的MVC模式演变出来的升级版。

代码流程：

在MVP中各层负责的内容是这样的...

• Model层

负责访问数据,数据源可以是远端数据,也可是本地数据库内的数据.

• View层

对应的Activity、Fragment类

• Presenter

负责View层与Model层的交互

MVP与MVC的区别

MVP与MVC的最大区别在于MVC允许View层对Model层直接进行交互，而MVP则不然，MVP中Model层只能通过Presenter与View层进行交互极大程度上实现了解耦。

MVP在代码中的基本流程

个人理解： MVP在庞大的项目结构中可能会充分发挥作用，可以由不同的人来完成不同的模块，充分的节省项目开发周期。但是应用在小项目里，却是增加了不少的类与接口，同时也增加了代码量，让本来很简洁的代码变得繁重。

实例：

大致流程

首先创建对应的接口 DemoView DemoModel DemoPresenter onFunctionListener 接口创建好了之后创建对应的实现类 MainActivity DemoModelClass DemoPresenterClass 以及对应的实体类

DemoView接口中所做的操作

public interface DemoView {// 开始网络请求的动画效果void showDialogDemo();// 关闭动画效果void dismissDialogDemo();// 请求成功void MainSuccess(Object object);// 请求失败void MainFial(Throwable throwable);
}
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DemoModel接口中的操作

// 主要是网络请求
public interface DemoModel {void shozanen(int id, OnFunctionListener listener);// 发现的接口数据void search(OnFunctionListener listener);}
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DemoPresenter接口

public interface DemoPresenter {// 用来调用M层网络请求void dataprocessing(int id);// 具体操作结束后关闭当前Viewvoid onDestroy();
}
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MainActivity 需要实现View的接口

public class MainActivity extends AppCompatActivity implements DemoView {private ImageView mImageView;private TextView mTextView;private Button mButton;private ProgressBar mBar;private DemoPresenterClass mLoginPresenter;private TextView mFial;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mImageView = (ImageView) findViewById(R.id.imageTV);mTextView = (TextView) findViewById(R.id.text_name);mButton = (Button) findViewById(R.id.ok_BT);mBar = (ProgressBar) findViewById(R.id.progr);mFial = (TextView) findViewById(R.id.fialTV);mLoginPresenter = new DemoPresenterClass(this);mButton.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Log.d("MainActivity", "点击事件");mLoginPresenter.dataprocessing(1);}});}@Overridepublic void showDialogDemo() {mBar.setVisibility(View.VISIBLE);}@Overridepublic void dismissDialogDemo() {mBar.setVisibility(View.GONE);}@Overridepublic void MainSuccess(Object object) {Log.d("MainActivity", "接收到最终的请求成功数据");Toast.makeText(this, "网络请求成功", Toast.LENGTH_SHORT).show();List<SearchEntity> list = (List<SearchEntity>) object;mTextView.setText(list.get(2).getKeyword());}@Overridepublic void MainFial(Throwable throwable) {Log.d("MainActivity", "最终接收到的失败数据");mFial.setText(throwable+"");}
}
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Presenter实现类

public class DemoPresenterClass implements DemoPresenter, OnFunctionListener {private DemoView mDemoView;private DemoModel mDemoModel;public DemoPresenterClass(DemoView demoView) {this.mDemoView = demoView;// 这里new出来的是Mode层的实现类this.mDemoModel = new DemoModelClass();}@Overridepublic void dataprocessing(int id) {Log.d("DemoPresenterClass", "准备网络请求");mDemoView.showDialogDemo();Log.d("DemoPresenterClass", "开始请求动画");switch (id){case 5:Log.d("DemoPresenterClass", "开始网络请求");mDemoModel.shozanen(id, this);break;case 1:Log.d("DemoPresenterClass", "开始网络请求search");mDemoModel.search(this);break;default:}}@Overridepublic void onDestroy() {mDemoView = null;}@Overridepublic void onSuccess(Object object) {Log.d("DemoPresenterClass", "接收Model请求成功层发来的数据");mDemoView.dismissDialogDemo();Log.d("DemoPresenterClass", "关闭请求动画");if (mDemoView != null) {Log.d("DemoPresenterClass", "将请求成功的数据发送到Activity");mDemoView.MainSuccess(object);}}@Overridepublic void onFail(Throwable throwable) {mDemoView.dismissDialogDemo();mDemoView.MainFial(throwable);Log.d("DemoPresenterClass", "接收Model层请求失败发来的数据");Log.d("DemoPresenterClass", "异常:" + throwable);}
}
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Model实现类

// 在这个类中做对数据的请求以及数据处理，并将数据发送给Presenterpublic class DemoModelClass implements DemoModel {@Overridepublic void shozanen(int id, final OnFunctionListener listener) {Log.d("DemoModelClass", "正在网络请求");RetrofitEncapsulation.getInstance().getFunctionApi().getShoZane(id).subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()).subscribe(new Consumer<ShoZaneEntity>() {@Overridepublic void accept(@NonNull ShoZaneEntity shoZaneEntity) throws Exception {Log.d("DemoModelClass", "请求成功,发送数据");listener.onSuccess(shoZaneEntity);}}, new Consumer<Throwable>() {@Overridepublic void accept(@NonNull Throwable throwable) throws Exception {Log.d("DemoModelClass", "请求失败,发送数据");listener.onFail(throwable);}});}@Overridepublic void search(final OnFunctionListener listener) {Log.d("DemoModelClass", "正在网络请求search");RetrofitEncapsulation.getInstance().getFunctionApi().getSearch().subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()).subscribe(new Consumer<List<SearchEntity>>() {@Overridepublic void accept(@NonNull List<SearchEntity> shoZaneEntities) throws Exception {Log.d("DemoModelClass", "请求成功,发送数据ShoZane");listener.onSuccess(shoZaneEntities);}}, new Consumer<Throwable>() {@Overridepublic void accept(@NonNull Throwable throwable) throws Exception {Log.d("DemoModelClass", "请求失败,发送数据ShoZane");listener.onFail(throwable);}});}}复制代码

最后onFunctionListener

public interface OnFunctionListener {// 成功void onSuccess(Object object);// 失败void onFail(Throwable throwable);
}
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效果展示：

最后的Log打印：

GitHub地址

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