public class HandlerDemo extends Activity implements OnScrollListener {

 private ListView mListView;
 LinearLayout loadingLayout;
 private Thread mThread;
 private ListViewAdapter adapter;

 private int startIndex = 1;// 從第1條開始
 private int size = 10;// 每次下載十條數(shù)據(jù)
 private List<News> newsList;
 List<Map<String, String>> data ;

 /*
 * 設置布局顯示屬性
 */
 private LayoutParams mLayoutParams = new LayoutParams(
  LinearLayout.LayoutParams.WRAP_CONTENT,
  LinearLayout.LayoutParams.WRAP_CONTENT);

 private LayoutParams ffLayoutParams = new LayoutParams(
  LinearLayout.LayoutParams.FILL_PARENT,
  LinearLayout.LayoutParams.FILL_PARENT);

 private ProgressBar progressBar;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 // TODO Auto-generated method stub
 super.onCreate(savedInstanceState);
 setContentView(R.layout.news_main);
 data=new ArrayList<Map<String, String>>();
 addView();
 }

 private void addView() {
 if (startIndex == 1) {
  newsList = new ArrayList<News>();
  newsList = getNewsList();
 }
 getdata(newsList);
 LinearLayout layout = new LinearLayout(this);
 layout.setOrientation(LinearLayout.HORIZONTAL);
 progressBar = new ProgressBar(this);
 layout.addView(progressBar, mLayoutParams);
 TextView textView = new TextView(this);
 textView.setText("加載中...");
 textView.setGravity(Gravity.CENTER_VERTICAL);
 layout.addView(textView, ffLayoutParams);
 layout.setGravity(Gravity.CENTER);
 loadingLayout = new LinearLayout(this);
 loadingLayout.addView(layout, mLayoutParams);
 loadingLayout.setGravity(Gravity.CENTER);

 // 得到一個ListView用來顯示條目
 mListView = (ListView) findViewById(R.id.listView);
 mListView.addFooterView(loadingLayout);
 adapter = new ListViewAdapter();
 mListView.setAdapter(adapter);
 mListView.setOnScrollListener(this);
 mListView.setTextFilterEnabled(true);
 }

 @Override
 public void onScroll(AbsListView view, int firstVisibleItem,
  int visibleItemCount, int totalItemCount) {
 // TODO Auto-generated method stub
 if (firstVisibleItem + visibleItemCount == totalItemCount) {
  if (mThread == null || !mThread.isAlive()) {
  mThread = new Thread() {

   @Override
   public void run() {
   newsList = new ArrayList<News>();
   newsList = getNewsList();
   getdata(newsList);
   Message msg = new Message();
   msg.what = 1;
   handler.sendMessage(msg);
   }
  };
  mThread.run();
  }
 }
 }
 
 Handler handler = new Handler() {

 @Override
 public void handleMessage(Message msg) {
  // TODO Auto-generated method stub
  if (msg.what == 1) {
  startIndex = startIndex + size;
  Log.v("startindex", startIndex + "");
  mListView.removeFooterView(loadingLayout);
  mThread.stop();
  adapter.count += size;
  adapter.notifyDataSetChanged();
  return;
  }
 }
 };

 class ListViewAdapter extends BaseAdapter {
 int count = 10;

 @Override
 public int getCount() {
  // TODO Auto-generated method stub
  return count;
 }

 @Override
 public Object getItem(int position) {
  // TODO Auto-generated method stub
  return position;
 }

 @Override
 public long getItemId(int position) {
  // TODO Auto-generated method stub
  return position;
 }
 
 @Override
 public View getView(int position, View convertView, ViewGroup parent) {
  // TODO Auto-generated method stub
  convertView = LayoutInflater.from(getApplicationContext()).inflate(
   R.layout.news_item, null);
  TextView textView = (TextView) convertView
   .findViewById(R.id.textNewsTitle);
  textView.setText((data.get(position)).get("title"));
  return convertView;
 }
 }

 @Override
 public void onScrollStateChanged(AbsListView view, int scrollState) {
 // TODO Auto-generated method stub

 }

 private List<Map<String, String>> getdata(List<News> list) {

 if (list == null)
  return null;
 for (News news : list) {
  Map<String, String> map = new HashMap<String, String>();
  map.put("title", news.getTitle());
  data.add(map);
 }
 return data;
 }

 /*
 * 獲取網絡數(shù)據(jù) 注：我是訪問本機的一個新聞服務，使用asp.net技術來實現(xiàn)的
 * 這個是項目是一個基于android的資訊播報軟件
 */
 private List<News> getNewsList() {
 String path = "http://10.0.2.2/getNewsList.aspx";
 String xmlStr = "<?xml version='1.0' encoding='utf-8'?><source><categoryIds>1,3,7</categoryIds><startIndex>"
  + startIndex
  + "</startIndex><detail>2</detail><count>"
  + size
  + "</count></source>";
 NewsConnector newsConnector = new NewsConnector();
 List<News> list = new ArrayList<News>();
 list = newsConnector.getNewsList(path, xmlStr);
 return list;
 }
}

@Override
 public void onScroll(AbsListView arg0, int arg1, int arg2, int arg3) {
 // TODO Auto-generated method stub
 if(arg1+arg2==arg3)
 {
  if(!isloading)
  {
  new myAsyncTask().execute(null);
  }
  else
  {
  mListView.removeFooterView(loadingLayout);
  }
 }
 }

 @Override
 public void onScrollStateChanged(AbsListView arg0, int arg1) {
 // TODO Auto-generated method stub
 
 }
 
 private class myAsyncTask extends AsyncTask<Void, Void, Void>
 {

 @Override
 protected Void doInBackground(Void... params) {
  // TODO Auto-generated method stub
  
  newsList = new ArrayList<News>();
  newsList = getNewsList();
  getdata(newsList);
  return null;
  
 }

 @Override
 protected void onPostExecute(Void result) {
  // TODO Auto-generated method stub
  super.onPostExecute(result);
  adapter.count+=size;
  adapter.notifyDataSetChanged();
  startIndex+=size;
  isloading=false;
 }

 @Override
 protected void onPreExecute() {
  // TODO Auto-generated method stub
  super.onPreExecute();
  isloading=true;
 }
 
 }