Android基于OkHttpUtils网络请求的二次封装

 /**
  * 3,加载更多
  * 注意事项:
  * 请求成功数据更新之后,要关闭SpringView
  */
 private void onDealLoadmore() {
  //资讯的网络请求地址
  String newsUrl = Constant.NEWS_URL;
  //http://www.oschina.net/action/api/news_list?pageIndex=0&catalog=1&pageSize=20
  //关闭SpringView
  mSpringView.onFinishFreshAndLoad();
  //网络请求
  OkHttpUtils
    .get()
    .url(newsUrl)
    .addParams("pageIndex", mCurrentPageIndex + "")//固定
    .addParams("catalog", "1")//固定,1代表资讯
    .addParams("pageSize", "20")//因为,一页加载20条数据
    .build()
    .execute(new StringCallback() {
     @Override
     public void onError(Call call, Exception e, int id) {
      Toast.makeText(mContext, "上拉加载失败", Toast.LENGTH_SHORT).show();
      /* //关闭SpringView
      mSpringView.onFinishFreshAndLoad();*/
     }

     @Override
     public void onResponse(String response, int id) {
      //请求成功,将字符串转为javaBean,并获取里面的泛型为News的集合
      NewsList newsList = XmlUtils.toBean(NewsList.class, response.getBytes());
      //对请求的数据进行非空判断
      if (newsList != null) {
       List<News> list = newsList.getList();
       if (list != null && list.size() > 0) {
        //数据的更新
        mData.addAll(newsList.getList());
        //适配器的更新
        mMyNewsPagerAdapter.notifyDataSetChanged();
        //请求页的索引要加1
        ++mCurrentPageIndex;
        /* //关闭SpringView
        mSpringView.onFinishFreshAndLoad();*/

       }
      }
     }
    });

 }

/**
  * 3,加载更多
  * 注意事项:
  * 请求成功数据更新之后,要关闭SpringView
  */
 private void onDealLoadmore() {
  mSpringView.onFinishFreshAndLoad();
  mNewsPagerProtocol.setCurrentPageIndex(mCurrentPageIndex);
  mNewsPagerProtocol.loadData(new NewsPagerProtocol.Callback() {
   @Override
   public void onError(Call call, Exception e, int id) {
    Toast.makeText(mContext, "下拉刷新失败", Toast.LENGTH_SHORT).show();
   }

   @Override
   public void onResponse(NewsList newsList, int id) {

    if (newsList != null) {


     //获取刷新的数据集合
     List<News> list = newsList.getList();
     //健壮性判断
     if (list != null && list.size() > 0) {
      //更新数据集合
      mData.addAll(list);
      //更新适配器
      mMyNewsPagerAdapter.notifyDataSetChanged();
      //更新页数的索引值
      mCurrentPageIndex ++ ;
     }
    }

   }
  });

 }

/**
 * Author:  归零
 * Date:  2017/3/4 1:08
 * Email:  4994766@qq.com
 * Description：网络请求和数据解析
 */
public class NewsPagerProtocol {


 private int mCurrentPageIndex;

 public void setCurrentPageIndex(int currentPageIndex) {

  mCurrentPageIndex = currentPageIndex;
 }


 public void loadData(final Callback callback) {
  //资讯的网络请求地址
  String newsUrl = Constant.NEWS_URL;
  //http://www.oschina.net/action/api/news_list?pageIndex=0&catalog=1&pageSize=20
  //网络请求
  OkHttpUtils
    .get()
    .url(newsUrl)
    .addParams("pageIndex", mCurrentPageIndex + "")//固定
    .addParams("catalog", "1")//固定,1代表资讯
    .addParams("pageSize", "20")//因为,一页加载20条数据
    .build()
    .execute(new StringCallback() {
     @Override
     public void onError(Call call, Exception e, int id) {
      //因为返回失败处理的请求不一样,所以不处理,交给调用的方法处理
      callback.onError(call, e, id);
     }

     @Override
     public void onResponse(String response, int id) {
      //请求成功,将字符串转为javaBean,并获取里面的泛型为News的集合
      NewsList newsList = XmlUtils.toBean(NewsList.class, response.getBytes());
      //将转换后的数据通过接口回调,返回给调用方法的
      callback.onResponse(newsList, id);
     }
    });
 }


 public interface Callback {

  public void onError(Call call, Exception e, int id);

  public void onResponse(NewsList newsList, int id);
 }
}