private class MyAdapter extends BaseAdapter{    private Context context;    private String[] strs = null;    LayoutInflater inflater = null;    public MyAdapter(Context context){      this.context = context;      //listview中循環顯示的數據      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，此值為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]實現listview中數據的循環      holder.text.setText(strs[position%strs.length]);      return view;    }}class ViewHolder{    public TextView text;}

@Overridepublic 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);    //設置listview初始化以后的默認選中項，要不然listview初始化以后只能向上拖動而不能向下拖動。}