private class MyAdapter extends BaseAdapter{
    private Context context;
    private String[] strs = null;
    LayoutInflater inflater = null;
    public MyAdapter(Context context){
      this.context = context;
      //listview中循环显示的数据
      strs = new String[]{"0","1","2","3","4","5","6","7","8","9"};
      inflater = LayoutInflater.from(context);
    }
    public MyAdapter(){
    }
    @Override
    public int getCount() {
      // TODO Auto-generated method stub
      //返回int可以保存的最大值，此值为2147483647
      return Integer.MAX_VALUE;
    }
    @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 view, ViewGroup parent) {
      // TODO Auto-generated method stub
      ViewHolder holder = null;
      if(view == null){
        holder = new ViewHolder();
        view = inflater.inflate(R.layout.textview, null);
        holder.text = (TextView) view.findViewById(R.id.text);
        view.setTag(holder);
      }else{
        holder = (ViewHolder) view.getTag();
      }
      //strs[position%strs.length]实现listview中数据的循环
      holder.text.setText(strs[position%strs.length]);
      return view;
    }
}
class ViewHolder{
    public TextView text;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    listView = (ListView) findViewById(R.id.listview);
    MyAdapter adapter = new MyAdapter(this);
    listView.setAdapter(adapter);
    listView.setSelection(Integer.MAX_VALUE/2+1);
    //设置listview初始化以后的默认选中项，要不然listview初始化以后只能向上拖动而不能向下拖动。
}