MVP 简单介绍

M（model）负责数据的请求，解析，过滤等数据操作

V（View）负责图示部分展示，图示事件处理，Activity，Fragment，Dialog，ViewGroup等呈现视图的组件都可以承担该角色

P（presenter）是View和Model交互的桥梁。

直接上代码

Activity

public class BaseActivity<P extends BasePresenter> extends AppCompatActivity implements MvpView {
    public P mPresenter;


    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initPresenter();
    }

    @Override
    public void showToast(String title, int des) {
        Toast.makeText(this, title, des).show();
    }

    private void initPresenter() {
        Class<P> tClass = (Class<P>) ((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0];
        try {
            this.mPresenter = tClass.newInstance();
            if (null != mPresenter) {
                mPresenter.attachView(this);
            }
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }

    public P getPersenter() {
        return mPresenter;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (null != mPresenter) {
            mPresenter.detachView();
        }
    }
}


public class WeatherActivity extends BaseActivity<PersenterWeather> implements IUIWeather, View.OnClickListener {

    private TextView mTv1;
    private TextView mTv2;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_weather);
        mTv1 = findViewById(R.id.TV1);
        mTv2 = findViewById(R.id.TV2);
        findViewById(R.id.BT1).setOnClickListener(this);
    }

    @Override
    public void updateWeather(WeatherData weather) {
        mTv1.setText("城市:" + weather.getData().getCity());
        mTv2.setText("温度:" + weather.getData().getWendu());
    }

    @Override
    public void onClick(View v) {
        mPresenter.getWeather();
    }
}

Presenter

public interface Presenter<V extends MvpView> {

    void attachView(V mMvpView);

    void detachView();

    V getMvpView();
}


public class BasePresenter<V extends MvpView> implements Presenter<V> {

    private V mMvpView;


    @Override
    public void attachView(V mMvpView) {
        this.mMvpView = mMvpView;
    }

    @Override
    public void detachView() {
        mMvpView = null;
    }

    @Override
    public V getMvpView() {
        return mMvpView;
    }
}

public class PersenterWeather extends BasePresenter<IUIWeather> {

    public void getWeather() {
        Retrofit retrofit = new Retrofit.Builder().baseUrl("https://www.apiopen.top/").addCallAdapterFactory(RxJava2CallAdapterFactory.create()).addConverterFactory(GsonConverterFactory.create()).build();
        final Api api = retrofit.create(Api.class);
        Observable<WeatherData> observable = api.getWeather("杭州");
        observable.subscribeOn(Schedulers.newThread())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Consumer<WeatherData>() {
                    @Override
                    public void accept(WeatherData weatherData) throws Exception {
                        getMvpView().updateWeather(weatherData);
                        getMvpView().showToast(new Gson().toJson(weatherData), Toast.LENGTH_LONG);
                    }
                });
    }
}

MvpView

public interface MvpView {
    void showToast(String title, int des);
}
public interface IUIWeather extends MvpView {
    void updateWeather(WeatherData weather);
}

源码地址:https://github.com/maxqiang1992/MVP