通过XListView实现上拉加载下拉刷新

来源：互联网发布：管家婆软件下载试用编辑：程序博客网时间：2024/05/22 03:12
## 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;    }
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