Xlistview刷新数据

public class MainActivity extends AppCompatActivity {

    private XListView x_list;
    //页数
    private int pageIndex = 1;
    //操作的类型 1：下拉刷新  2：上拉加载
    private int type = 1;
//    给Bean包设置一个集合
    private List<MyBean.DataBean> list = new ArrayList<>();

    private String path = "http://api.expoon.com/AppNews/getNewsList/type/1/p/1";
    private List_Baseadapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
//        设置上拉加载
        x_list.setPullLoadEnable(true);
      //设置支持下拉刷新
        x_list.setPullRefreshEnable(true);
//给xlist获得的空间设置一个点击事件
        x_list.setXListViewListener(new XListView.IXListViewListener() {
            //            刷新
            @Override
            public void onRefresh() {
                type = 1;
                //重新请求第一页的数据 10条数据
                pageIndex = 1;
                String path = "http://api.expoon.com/AppNews/getNewsList/type/1/p/" + pageIndex;
                new asyncTask().execute(path);
            }
            //加载
            @Override
            public void onLoadMore() {
                type = 2;
                pageIndex++;
                //进行地址的拼接
                String path = "http://api.expoon.com/AppNews/getNewsList/type/1/p/" + pageIndex;
                //执行异步请求
                new asyncTask().execute(path);
            }
        });
        new asyncTask().execute(path);
    }
//继承异步
    class asyncTask extends AsyncTask<String, Void, String> {

        @Override
        protected String doInBackground(String... params) {
//获取网络
            try {
                URL url = new URL(path);
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                connection.setRequestMethod("GET");
                connection.setReadTimeout(5000);
                connection.setConnectTimeout(5000);

                int responseCode = connection.getResponseCode();
                Log.d("SSS", "++++++++++++++++++" + responseCode);
//                判断是否是200响应码
                if (responseCode == 200) {
//解析
                    InputStream inputStream = connection.getInputStream();
                    String s = streamToString(inputStream, "utf-8");
                    Log.d("SSS", "+++++sssss++++" + s);
                    return s;
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }
        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            Gson gson = new Gson();
            MyBean myBean = gson.fromJson(s, MyBean.class);
            
            
            // List<MyBean.DataBean> data = myBean.getData();
            //Log.d("SSS", "+++++MY++++" + data.toString());
            if (type == 1) {//代表刷新
                //如果是刷新的话
                list.clear();//清除原有的数据
                list.addAll(myBean.getData());//添加新的数据
                setAdapter();
                //关闭xlistview的头部视图--延迟关闭
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        x_list.stopRefresh();//关闭
                        // 获得此时此刻时间
                        Date date = new Date(System.currentTimeMillis());
                        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                        String s = sdf.format(date);
                        x_list.setRefreshTime(s);//设置刷新时间
                    }
                }, 1000);
            } else if (type == 2) {//代表加载更多
                //得到数据
                list.addAll(myBean.getData());//datas.addAll(0,result.getData());//将新请求的数据添加到集合的最前面
                //设置适配器
                setAdapter();
                //关闭xlistview的底部视图--延迟关闭
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        x_list.stopLoadMore();
                    }
                }, 1000);
            } else {
            }
        }
    }
    public void setAdapter() {
        if (adapter == null) {
            Log.d("SSSSSSSSSSSSSS", "+++++++listtttttt++++++++" + list);
            adapter = new List_Baseadapter(MainActivity.this,list);
            x_list.setAdapter(adapter);
        } else {
            //否则刷新适配器
            adapter.notifyDataSetChanged();
        }
    }
//    解析数据
    private String streamToString(InputStream inputStream, String s) {
        try {
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

            String a = "";
            StringBuffer stringBuffer = new StringBuffer();
            while ((a = bufferedReader.readLine()) != null) {
                stringBuffer.append(a);
            }
            bufferedReader.close();
            return stringBuffer.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }
//获得控件
    private void initView() {
        x_list = (XListView) findViewById(R.id.x_list);
    }
}