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<Data  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<Data ) msg.obj;
myAdapter = new NewsFragmentAdapter(context, listData);
xlv.setAdapter(myAdapter);
break;
case 1:
LinkedList<Data  shualist = (LinkedList<Data ) msg.obj;
myAdapter = new NewsFragmentAdapter(context, shualist);
for (int i = 0; i < shualist.size(); i++) {
listData.addFirst(shualist.get(i));
}
myAdapter.notifyDataSetChanged();
stopLoadOrRefresh();
break;
case 2:
LinkedList<Data  loadlist = (LinkedList<Data ) msg.obj;
myAdapter = new NewsFragmentAdapter(context, loadlist);
for (int i = 0; i < loadlist.size(); i++) {
listData.addLast(loadlist.get(i));
}
myAdapter.notifyDataSetChanged();
stopLoadOrRefresh();
break;
default:
break;
}
}
};
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
context=getActivity();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment, container, false);
path = getArguments().getString("path");
// 配置Xlist
xlv = (XListView) view.findViewById(R.id.xlv); // 获得控件
xlv.setPullRefreshEnable(true);         // 设置可以下拉刷新
xlv.setPullLoadEnable(true);          // 设置可以上拉加载
xListViewListener();              // 调用XListView的监听方法
if(path != null){
getMessage(path, 0);            // 调用方法请求数据
}
itemClickListner();               // 调用XListView条目点击监听方法
return view;
}
private void itemClickListner() {
xlv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?  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<String () {
// 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<String  arg0) {
String info = arg0.result;
Gson gson = new Gson();
LinkedList<Data  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;
}