AndroidListView滚动到底后自动加载数据

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 package com.scott.loadmore; 
 
 import java.util.List; 
 
 import android.content.Context; 
 import android.view.LayoutInflater; 
 import android.view.View; 
 import android.view.ViewGroup; 
 import android.widget.BaseAdapter; 
 import android.widget.TextView; 
 
 public class ListViewAdapter extends BaseAdapter { 
 private List items; 
 private LayoutInflater inflater; 
  
 public ListViewAdapter(Context context, List items) { 
  this.items = items; 
  inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
 } 
  
 @Override 
 public int getCount() { 
  return items.size(); 
 } 
 
 @Override 
 public Object getItem(int position) { 
  return items.get(position); 
 } 
 
 @Override 
 public long getItemId(int position) { 
  return position; 
 } 
 
 @Override 
 public View getView(int position, View view, ViewGroup parent) { 
  if (view == null) { 
  view = inflater.inflate(R.layout.list_item, null); 
  } 
  TextView text = (TextView) view.findViewById(R.id.list_item_text); 
  text.setText(items.get(position)); 
  return view; 
 } 
  
 /** 
  * 添加列表项 
  * @param item 
  */ 
 public void addItem(String item) { 
  items.add(item); 
 } 
 } 

 package com.scott.loadmore; 
 
 import java.util.ArrayList; 
 
 import android.app.ListActivity; 
 import android.os.Bundle; 
 import android.os.Handler; 
 import android.util.Log; 
 import android.view.View; 
 import android.widget.AbsListView; 
 import android.widget.AbsListView.OnScrollListener; 
 import android.widget.Button; 
 import android.widget.ListView; 
 
 public class MainActivity extends ListActivity implements OnScrollListener { 
 private ListView listView; 
 private int visibleLastIndex = 0; //最后的可视项索引 
 private int visibleItemCount; // 当前窗口可见项总数 
 private ListViewAdapter adapter; 
 private View loadMoreView; 
 private Button loadMoreButton; 
 private Handler handler = new Handler(); 
 
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.main); 
  
  loadMoreView = getLayoutInflater().inflate(R.layout.load_more, null); 
  loadMoreButton = (Button) loadMoreView.findViewById(R.id.loadMoreButton); 
 
  listView = getListView();  //获取id是list的ListView 
  
  listView.addFooterView(loadMoreView); //设置列表底部视图 
 
  initAdapter(); 
  
  setListAdapter(adapter);  //自动为id是list的ListView设置适配器 
  
  listView.setOnScrollListener(this); //添加滑动监听 
 } 
  
 /** 
  * 初始化适配器 
  */ 
 private void initAdapter() { 
  ArrayList items = new ArrayList(); 
  for (int i = 0; i <10; i++) { 
  items.add(String.valueOf(i + 1)); 
  } 
  adapter = new ListViewAdapter(this, items); 
 } 
 
 /** 
  * 滑动时被调用 
  */ 
 @Override 
 public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { 
  this.visibleItemCount = visibleItemCount; 
  visibleLastIndex = firstVisibleItem + visibleItemCount - 1; 
 } 
 
 /** 
  * 滑动状态改变时被调用 
  */ 
 @Override 
 public void onScrollStateChanged(AbsListView view, int scrollState) { 
  int itemsLastIndex = adapter.getCount() - 1; //数据集最后一项的索引 
  int lastIndex = itemsLastIndex + 1;  //加上底部的loadMoreView项 
  if (scrollState == OnScrollListener.SCROLL_STATE_IDLE && visibleLastIndex == lastIndex) { 
  //如果是自动加载,可以在这里放置异步加载数据的代码 
  Log.i("LOADMORE", "loading..."); 
  } 
 } 
  
 /** 
  * 点击按钮事件 
  * @param view 
  */ 
 public void loadMore(View view) { 
  loadMoreButton.setText("loading..."); //设置按钮文字loading 
  handler.postDelayed(new Runnable() { 
  @Override 
  public void run() { 
   
   loadData(); 
   
   adapter.notifyDataSetChanged(); //数据集变化后,通知adapter 
   listView.setSelection(visibleLastIndex - visibleItemCount + 1); //设置选中项 
   
   loadMoreButton.setText("load more"); //恢复按钮文字 
  } 
  }, 2000); 
 } 
  
 /** 
  * 模拟加载数据 
  */ 
 private void loadData() { 
  int count = adapter.getCount(); 
  for (int i = count; i