MVP_Retrofit

MVP设计模式在Android中的应用

MVC_Retrofit_Android

MVC设计模式和Retrofit框架在Android项目中的应用

#先看项目演示

#MVP

视图（View）：也就是Android中的Activity。同时需要创建一个View的抽象接口View interface。需要View实现的接口，View通过View interface与Presenter进行交互，降低耦合。。
纽带（Persenter）：作为View与Model交互的中间纽带，处理与用户交互的负责逻辑。(抽象接口出来方便通信)
模型（Model）：用来操做实际数据（譬如数据存储等）。有时也需要创建一个Model的抽象接口Model interface用来降低耦合

如下图很直观的展示了MVP框架的核心：

View实例化Persenter抽象类,通过Persenter控制Model获取数据，Model获取了数据回调Persenter改变View。简单来说就是在MVC的基础上把VC都当作了V，通过中间纽带Persenter连接V和M。

#应用 架构图：

View层：MainActivity实现View接口方便实例化时交给Persenter管理，通过Persenter回调，activity中只做UI操作。

public class MainActivity extends AppCompatActivity implements MainView{

@Bind(R.id.edit_num)
EditText editNum;
@Bind(R.id.btn_go)
Button btnGo;
@Bind(R.id.loadding)
LoadingView loadding;
@Bind(R.id.show_text)
TextView showText;
private MainPresenterImpl presenter = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ButterKnife.bind(this);
    if (null == presenter) {
        presenter = new MainPresenterImpl(this);
    }
    presenter.initView();
}
@Override
public void initView() {
    loadding.withLoadedEmptyText("≥﹏≤ , 连条毛都没有 !").withEmptyIco(R.mipmap.disk_file_no_data).withBtnEmptyEnnable(false)
            .withErrorIco(R.mipmap.ic_chat_empty).withLoadedErrorText("(῀( ˙᷄ỏ˙᷅ )῀)ᵒᵐᵍᵎᵎᵎ,我家程序猿跑路了 !").withbtnErrorText("去找回她!!!")
            .withLoadedNoNetText("你挡着信号啦o(￣ヘ￣o)☞ᗒᗒ 你走").withNoNetIco(R.mipmap.ic_chat_empty).withbtnNoNetText("网弄好了，重试")
            .withLoadingIco(R.drawable.loading_animation).withLoadingText("加载中...").withOnRetryListener(new OnRetryListener() {
        @Override
        public void onRetry(){
            //传送给P层次
            presenter.sendRequest(MainActivity.this,editNum.getText().toString().trim());
        }
    }).build();
    btnGo.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //传送给P层次
            presenter.sendRequest(MainActivity.this,editNum.getText().toString().trim());
        }
    });
    loadding.setVisibility(View.GONE);
    showText.setVisibility(View.GONE);
}

@Override
public void showSuccess(Weather weather) {
    showText.setText(weather.toString());
    loadding.setVisibility(View.GONE);
    showText.setVisibility(View.VISIBLE);
}

@Override
public void showNoNet() {
    loadding.setState(LoadingState.STATE_NO_NET);
    loadding.setVisibility(View.VISIBLE);
    showText.setVisibility(View.GONE);
}

@Override
public void showError() {
    loadding.setState(LoadingState.STATE_ERROR);
    loadding.setVisibility(View.VISIBLE);
    showText.setVisibility(View.GONE);
}

@Override
public void showLoadding() {
    loadding.setState(LoadingState.STATE_LOADING);
    loadding.setVisibility(View.VISIBLE);
    showText.setVisibility(View.GONE);
}
}

Model层做一些获取数据或者改变数据的操作，可以通过传递Persenter接口实现回掉，也可以直接实例化Persenter实现回调（接口比较直观）：

public class MainModelImpl implements MainModle{
private static final String TAG = "MainModelImpl";
/**
 * 实现MainModole获取天气信息
 * Created by fan on 2016/10/16.
 * cityNum:城市代码
 * listener:网络连接是否成功接口
 */
@Override
public void getWeather(Context context, String cityNum, final MainPresenter listener) {
    ApiManager.getWeather(cityNum)
            .subscribeOn(Schedulers.io())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(new Action1<Weather>() {
        @Override
        public void call(Weather weather) {
            Log.e(TAG, "MainModelImpl:" + weather);
            listener.onSuccess(weather);
        }
    }, new Action1<Throwable>() {
        @Override
        public void call(Throwable throwable) {
            Log.e(TAG, "MainModelImpl:" + throwable);
            listener.onError();
        }
    });
}
}

Persenter层：控制View和Modle

public class MainPresenterImpl implements MainPresenter{
private MainView mainView;
private MainModle mainModle;
public MainPresenterImpl(MainView mainView){
    this.mainView = mainView;
    mainModle = new MainModelImpl();
}

@Override
public void onSuccess(Weather weather) {
    mainView.showSuccess(weather);
}

@Override
public void onError() {
    mainView.showError();
}

@Override
public void showNoNet() {
    mainView.showNoNet();
}

@Override
public void initView() {
    mainView.initView();
}

@Override
public void sendRequest(Context context, String cityNum) {
    mainView.showLoadding();
    mainModle.getWeather(context,cityNum,this);
}

#主要代码 *MainActivity:

private MainPresenter presenter = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ButterKnife.bind(this);
    if (null == presenter) {
        presenter = new MainPresenterImpl(this);//实例化Persenter
    }
    presenter.initView();
}

*Presenter:

private MainView mainView;
private MainModle mainModle;
public MainPresenterImpl(MainView mainView){
    this.mainView = mainView;
    mainModle = new MainModelImpl();
}

*Model: 通过接口连接M和View

public void getWeather(Context context, String cityNum, final MainPresenter listener) {
    ApiManager.getWeather(cityNum)
            .subscribeOn(Schedulers.io())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(new Action1<Weather>() {
        @Override
        public void call(Weather weather) {
            Log.e(TAG, "MainModelImpl:" + weather);
            listener.onSuccess(weather);
        }
    }, new Action1<Throwable>() {
        @Override
        public void call(Throwable throwable) {
            Log.e(TAG, "MainModelImpl:" + throwable);
            listener.onError();
        }
    });
}

#Retrofit2

private static final String STARTURL = "http://apis.baidu.com";
private static final Retrofit getServiceList = new Retrofit.Builder()
        .baseUrl(STARTURL)
        .addConverterFactory(GsonConverterFactory.create())
        .addCallAdapterFactory(RxJavaCallAdapterFactory.create()) // 使用RxJava作为回调适配器
        .build();
private static final ApiService apiManager = getServiceList.create(ApiService.class);
public static Observable<Weather> getWeather(String pinyin){
    return apiManager.getWeather("c50757d2e4d31f64290d503c74fe6054",pinyin);
}


public interface ApiService {


@GET("/apistore/weatherservice/weather")
Observable<Weather> getWeather(@Header("apikey") String apikey, @Query("citypinyin") String pinyin);
}