加载刷新

到官方网站上下载XListview SDK,把view中的三个java类，复制到工程中，布局中的三个布局文件也复制过去，Strings中也要复制

public class Fragment extends android.support.v4.app.Fragment {

    private XListView lv;
    private String pathUrl;
    private MainAdapter adapter;
    //集合和数组再用之前需要new出来
    private List<Bean1.Data> dataList = new ArrayList<>();//适配数据集合

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view=inflater.inflate(R.layout.fragment,container,false);
        //获得控件
        lv = (XListView) view.findViewById(R.id.main_fragment_lv);

        //获得传值
        Bundle arguments = getArguments();
        pathUrl = arguments.getString("pathUrl", "");
        //请求数据
        getData(0);

        //初始化事件
        initEvent();

        return view;
    }

    private void initEvent() {
        //设置激活上拉加载更多
        lv.setPullLoadEnable(true);
        //下拉刷新
        lv.setPullRefreshEnable(true);
        //监听
        lv.setXListViewListener(new XListView.IXListViewListener() {
            @Override
            public void onRefresh() {

                //下拉刷新
                //清空集合数据
                dataList.clear();
                //刷新
                getData(1);
                //刷新时间
                refreshTime();

            }
            @Override
            public void onLoadMore() {
                getData(2);
            }
        });
        //lv条目监听
        lv.setOnItemClickListener(itemListenr);
    }

    private void getData(final int i) {
        new AsyncTask<String,Void,String>(){
            @Override
            protected String doInBackground(String... strings) {

                try {
                    String path=strings[0];
                    URL url=new URL(path);
                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                    conn.setRequestMethod("GET");
                    conn.setConnectTimeout(5000);
                    int code=conn.getResponseCode();
                    if(code==200){
                        InputStream is = conn.getInputStream();
                        //调用方法，读取流
                        String json = StreamTools.readData(is);
                        return json;
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
                return null;
            }

            @Override
            protected void onPostExecute(String s) {
                //把json串转成对象
                Gson gson=new Gson();
                Bean1 bean1 = gson.fromJson(s,Bean1.class);
                //获得适配数据集合
                List<Bean1.Data> data = bean1.getData();
                //创建新集合，addAll（）是添加集合的，add()是添加元素，把元素添加到集合
                dataList.addAll(data);

                //适配器
                if(i == 0){//第一次加载
                    adapter = new MainAdapter(dataList,getContext());
                    lv.setAdapter(adapter);
                }else if(i == 1 || i==2){//上拉，下拉状态
                    adapter.notifyDataSetChanged();
                    stopXlistView();//停止刷新
                }

                super.onPostExecute(s);
            }
        }.execute(pathUrl);
    }

    private void refreshTime() {
        //设置刷新时间
        Date date=new Date();
        SimpleDateFormat format=new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");
        String time = format.format(date);
        lv.setRefreshTime(time);
    }

    private void stopXlistView() {
        //停止加载，刷新
        lv.stopLoadMore();
        lv.stopRefresh();
    }
    //条目监听
    AdapterView.OnItemClickListener itemListenr=new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            //跳转
            Intent intent=new Intent(getContext(),WebViewActivity.class);
            //传值
            intent.putExtra("article_path",dataList.get(i-1).getArticle_url());
            startActivity(intent);
        }
    };

}

注意：引用xlistview时需要引用全类名