MVP

《MainModel》
public interface MainModel {
interface CallBackListener {
void success(String data);

    void fail();
}

void getData(CallBackListener listener);

}

《MainModelIml 》
public class MainModelIml implements MainModel {

@Override
public void getData(final CallBackListener listener) {
    //请求数据
    new OkHttpUtils().get("http://365jia.cn/news/api3/365jia/news/headline?page=1").result(new OkHttpUtils.HttpListener() {
        @Override
        public void success(String data) {
            listener.success(data);
        }

        @Override
        public void fail() {
            listener.fail();
        }
    });
}

}

《MainPresenter 》
public interface MainPresenter {
void doData();
}

《MainPresenterIml 》
public class MainPresenterIml implements MainPresenter, MainModel.CallBackListener {
private MainModel mainModel;
private MainView mainView;

public MainPresenterIml(MainModel mainModel, MainView mainView) {
    this.mainModel = mainModel;
    this.mainView = mainView;
}

@Override
public void doData() {
    mainModel.getData(this);
}

@Override
public void success(String data) {
    mainView.success(data);
}

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

//解决内存泄漏
public void destroy() {
    if (mainView != null) {
        mainView = null;
    }
    if (mainModel != null) {
        mainModel = null;
    }
    System.gc();
}

}

《MainView 》
public interface MainView {

void success(String data);

void fail();

}

《OkHttpUtils 》
public class OkHttpUtils {

private int HTTP_SUCCESS=1000;

private int HTTP_FAIL=1001;

private HttpListener mHttpListener;



public OkHttpUtils get(String url) {
    doHttp(url, 0,null);
    return this;
}

public OkHttpUtils post(String url,FormBody.Builder bodyBuilder) {
    doHttp(url, 1,bodyBuilder);
    return this;
}

//网络请求
private void doHttp(String url, int i,FormBody.Builder bodyBuilder) {
    OkHttpClient client = new OkHttpClient();
    Request.Builder builder = new Request.Builder();
    builder.url(url);
    if (i == 0) {//Get请求
        builder.get();
    } else {
        RequestBody body=bodyBuilder.build();
        builder.post(body);
    }
    Request request = builder.build();

   final Message message=Message.obtain();
    client.newCall(request).enqueue(new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
            message.what=HTTP_FAIL;
            handler.sendMessage(message);
        }

        @Override
        public void onResponse(Call call, Response response) throws IOException {

            message.obj=response.body().string();
            message.what=HTTP_SUCCESS;
            handler.sendMessage(message);
        }
    });
}

private Handler handler=new Handler(){
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        if(msg.what==HTTP_SUCCESS){//成功
            String data= (String) msg.obj;
            mHttpListener.success(data);
        }else{
            mHttpListener.fail();
        }
    }
};


//通过方法传递接口
public void result(HttpListener mHttpListener){
    this.mHttpListener=mHttpListener;
}


public interface HttpListener{
    void success(String data);
    void fail();
}

}

《MainActivity 》
public class MainActivity extends AppCompatActivity implements MainView {

private MainPresenterIml mMainPresenterIml;
private XRecyclerView mRecyclerView;
private NewsAdapter mNewsAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mRecyclerView = (XRecyclerView) findViewById(R.id.recycler);

    //设置布局管理器
    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
    linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
    mRecyclerView.setLayoutManager(linearLayoutManager);

    //设置适配器
    mNewsAdapter = new NewsAdapter(this);
    mRecyclerView.setAdapter(mNewsAdapter);

    //开启上拉加载
    mRecyclerView.setLoadingMoreEnabled(true);

    mRecyclerView.setLoadingListener(new XRecyclerView.LoadingListener() {
        @Override
        public void onRefresh() {
            //下拉刷新
            mMainPresenterIml.doData();
        }

        @Override
        public void onLoadMore() {
            //上拉加载
            mMainPresenterIml.doData();

        }
    });


    mMainPresenterIml = new MainPresenterIml(new MainModelIml(), this);
    //获取数据
    mMainPresenterIml.doData();
}

@Override
public void success(String data) {
    //请求成功之后
    NewsBean bean = new Gson().fromJson(data, NewsBean.class);
    mNewsAdapter.setData(bean.getData().getData());
    mRecyclerView.refreshComplete();//关闭下拉
    mRecyclerView.loadMoreComplete();//关闭上拉


}

@Override
public void fail() {
    //失败
    mRecyclerView.refreshComplete();
    mRecyclerView.loadMoreComplete();
}


@Override
protected void onDestroy() {
    super.onDestroy();
    mMainPresenterIml.destroy();
}

}

《activity_main》

<com.jcodecraeer.xrecyclerview.XRecyclerView
android:id="@+id/recycler"
android:layout_width=“match_parent”
android:layout_height=“match_parent”/>

《news_itme》

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <ImageView
        android:id="@+id/image"
        android:layout_width="100dp"
        android:layout_height="100dp" />

    <TextView
        android:id="@+id/tv_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/image" />

</RelativeLayout>