Android通过XListView实现上拉加载下拉刷新功能

## 导入XListVIew第三方库文件。通过LinkedList将刷新数据插入到集合头部，将加载的数据放入集合尾部 ##
  private Context context;
  private View view;
  private String path;
  private XListView xlv;
  private LinkedList listData;

  private Handler handler = new Handler() {

    @SuppressWarnings("unchecked")
    public void handleMessage(android.os.Message msg) {

      int code = msg.arg1;
      if(msg.arg1==400){
        Toast.makeText(context, "数据格式解析不正确", 0).show();
      }
      else{
        NewsFragmentAdapter myAdapter = null;
        switch (code) {
        case 0:
          // 默认
          listData = (LinkedList) msg.obj;
          myAdapter = new NewsFragmentAdapter(context, listData);
          xlv.setAdapter(myAdapter);
          break;
        case 1:
          LinkedList shualist = (LinkedList) msg.obj;
          myAdapter = new NewsFragmentAdapter(context, shualist);
          for (int i = 0; i  loadlist = (LinkedList) msg.obj;
          myAdapter = new NewsFragmentAdapter(context, loadlist);
          for (int i = 0; i  arg0, View arg1, int arg2, long arg3) {
        Intent intent=new Intent(context, WebViewActivity.class);
        intent.putExtra("path", listData.get(arg2-1).article_url);
        startActivity(intent);
      }
    });
  }

  public void xListViewListener() {
    xlv.setXListViewListener(new IXListViewListener() {

      // 当下拉刷新时实现的操作
      @Override
      public void onRefresh() {
        getMessage(path, 1);  // 请求网络，将新请求的内容加载到集合前端
      }

      // 当上拉加载时实现的操作内容
      @Override
      public void onLoadMore() { // 请求网络，将请求的新内容加载到集合后端
        getMessage(path, 2);
      }
    });

  }

  public void getMessage(String path, final int code) {

    HttpUtils utils = new HttpUtils();

    // 设置刷新间隔时间，如果不设置默认一分钟后才能刷新出新内容
    utils.configCurrentHttpCacheExpiry(0);

    utils.send(HttpMethod.GET, path, new RequestCallBack() {

      // 请求网络失败回调的方法
      @Override
      public void onFailure(HttpException arg0, String arg1) {
      }

      // 请求网络成功回调的方法
      @Override
      public void onSuccess(ResponseInfo arg0) {
        String info = arg0.result;

        Gson gson = new Gson();
        LinkedList list = gson.fromJson(info, ModelBean.class).data;
        Message message = new Message();
        if(list != null){
          message.arg1 = code;
          message.obj = list;
        }else{
          message.arg1=400;
        }
        handler.sendMessage(message);
      }
    });
  }

  private void stopLoadOrRefresh() {
    // 停止加载
    xlv.stopLoadMore();
    // 停止刷新
    xlv.stopRefresh();
    // 最近一次刷新时间
    xlv.setRefreshTime(getTime());
  }

  public String getTime() {
    // 格式化时间
    SimpleDateFormat format = new SimpleDateFormat("hh:mm:ss");
    Date date = new Date();
    String time = format.format(date);
    return time;
  }