XListView实现上拉加载下拉刷新,注意事项

使用XListview注意事项:首先将下载好的开源github代码中的view包里面的三个类,xlistview,xlistviewFooter,xlistviewHeaderlayout里面的xlistview_header,xlistview_footervalues下面的strings.xml里面的代码复制进来drawable下面的一张图片还要改那些类的R文件public class Fragmentzhu extends Fragment implements XListView.IXListViewListener {    @Nullable    private List<DBean.DataBean> list = new ArrayList<>();    int zhi = 1;    int num = 1;//页数    private MyAdapter myAdapter;    private XListView xListView;    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        View view = inflater.inflate(R.layout.fragmentzhubeijing, container, false);        xListView = view.findViewById(R.id.xlist_view);        xListView.setPullLoadEnable(true);        xListView.setPullRefreshEnable(true);        xListView.setXListViewListener(this);        return view;    }    @Override    public void onActivityCreated(@Nullable Bundle savedInstanceState) {        super.onActivityCreated(savedInstanceState);        Bundle bundle = getArguments();        zhi = bundle.getInt("key");        Log.i("zhi",zhi+"");        getDataFromNet();    }    private void getDataFromNet() {        AsyncTask<Void, Void, String> asyncTask = new AsyncTask<Void, Void, String>() {            @Override            protected String doInBackground(Void... voids) {                String path = "http://api.expoon.com/AppNews/getNewsList/type/1/p"+num;                try {                    URL url = new URL(path);                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();                    //设置请求                    connection.setRequestMethod("GET");                    connection.setReadTimeout(5000);                    connection.setConnectTimeout(5000);                    //获取                    int responseCode = connection.getResponseCode();                    if (responseCode == 200){                        InputStream inputStream = connection.getInputStream();                        String json = streamToString(inputStream,"utf-8");                        return json;                    }                } catch (Exception e) {                    e.printStackTrace();                }                return "";            }            @Override            protected void onPostExecute(String json) {                Log.i("--",json);                Gson gson = new Gson();                DBean dBean = gson.fromJson(json, DBean.class);                list.addAll(dBean.getData());                setAdapter();                xListView.stopLoadMore();            }        };        asyncTask.execute();    }    private void setAdapter() {        if (myAdapter==null) {            myAdapter = new MyAdapter(list, getActivity());             xListView.setAdapter(myAdapter);        }else{            myAdapter.notifyDataSetChanged();        }    }    private String streamToString(InputStream inputStream, String charset) {        try {            InputStreamReader inputStreamReader = new InputStreamReader(inputStream,charset);            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);            String s = null;            StringBuilder builder = new StringBuilder();            while ((s = bufferedReader.readLine()) != null){                builder.append(s);            }            bufferedReader.close();            return builder.toString();        } catch (Exception e) {            e.printStackTrace();        }        return null;    }    @Override    public void onRefresh() {        num--;        if (num>0){           refreshData();        }else{            Toast.makeText(getActivity(),"已经是第一页了",Toast.LENGTH_SHORT).show();            xListView.stopRefresh();        }    }    @Override    public void onLoadMore() {            num++;            getDataFromNet(); }    private void refreshData() {            AsyncTask<Void, Void, String> asyncTask = new AsyncTask<Void, Void, String>() {                @Override                protected String doInBackground(Void... voids) {                    String path = "http://api.expoon.com/AppNews/getNewsList/type/1/p"+num;                    try {                        URL url = new URL(path);                        HttpURLConnection connection = (HttpURLConnection) url.openConnection();                        //设置请求                        connection.setRequestMethod("GET");                        connection.setReadTimeout(5000);                        connection.setConnectTimeout(5000);                        //获取                        int responseCode = connection.getResponseCode();                        if (responseCode == 200){                            InputStream inputStream = connection.getInputStream();                            String json = streamToString(inputStream,"utf-8");                            return json;                        }                    } catch (Exception e) {                        e.printStackTrace();                    }                    return "";                }                @Override                protected void onPostExecute(String json) {                    Log.i("--",json);                    Gson gson = new Gson();                    DBean dBean = gson.fromJson(json, DBean.class);                    list.addAll(0,dBean.getData());                    setAdapter();                    xListView.stopRefresh();                    //设置刷新时间                    long currentTimeMillis = System.currentTimeMillis();                    Date date = new Date(System.currentTimeMillis());                    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("HH:mm");                    String time = simpleDateFormat.format(date);                    xListView.setRefreshTime(time);                }            };            asyncTask.execute();    }}