xlistview基础使用

public class Fragment01 extends Fragment{

    private XListView xlistview;
    private int pageIndex=1;
    private int operType=1;
    private String myurl="http://www.yulin520.com/a2a/impressApi/news/mergeList?pageSize=10&page="+pageIndex;
    private ArrayList<JsonData.DataBean> datas;
    private MyAdapter adapter;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment01, container, false);
        xlistview = view.findViewById(R.id.xlistview);
        //初始化
        initXlv();
        return view;

    }
    
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        datas = new ArrayList<>();
        //请求网络数据
        requestNetData();
    }
    

    private void requestNetData() {
        new MyAsyncTask().execute(myurl);
    }
    class MyAsyncTask extends AsyncTask<String,Void,String>{
        @Override
        protected String doInBackground(String... strings) {
            RequestNetJson netJson = new RequestNetJson();
            String json = netJson.getJson(strings[0]);

            return json;
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            Gson gson = new Gson();
            JsonData jsonData = gson.fromJson(s, JsonData.class);
            List<JsonData.DataBean> data = jsonData.getData();
            if (operType==1){//代表刷新操作清空集合
                datas.clear();
            }
            //集合添加数据
            datas.addAll(data);
            setAdapter();
            if(operType==1){
                //关闭头部刷新视图
                xlistview.stopRefresh();
                //上次刷新时间
                Date date=new Date(System.currentTimeMillis());
                SimpleDateFormat sdf=new SimpleDateFormat("MM-dd HH:mm:ss");
                String time = sdf.format(date);
                xlistview.setRefreshTime(time);
            }else {
                //关闭底部加载视图
                xlistview.stopLoadMore();
    }
}
    }
    //设置适配器
    private void setAdapter(){
        if(adapter==null){
            adapter = new MyAdapter(getContext(), datas);
            xlistview.setAdapter(adapter);
        }else {
            adapter.notifyDataSetChanged();
        }
    }
    private void initXlv() {
        xlistview.setPullLoadEnable(true);//上拉加载
        xlistview.setPullRefreshEnable(true);//下拉刷新
        //上下拉刷新回调接口
        xlistview.setXListViewListener(new XListView.IXListViewListener() {
            @Override
            public void onRefresh() {//刷新时回调
                operType=1;
                pageIndex=1;
                myurl="http://www.yulin520.com/a2a/impressApi/news/mergeList?pageSize=10&page="+pageIndex;
                requestNetData();
            }

            @Override
            public void onLoadMore() {//加载更多时回调
                operType=2;
                pageIndex++;
                myurl="http://www.yulin520.com/a2a/impressApi/news/mergeList?pageSize=10&page="+pageIndex;
                requestNetData();
            }
        });
    }
}