Android ListView内容变化后的动态刷新

//用于显示用户列表的ListView
private ListView userList = null;
//用户列表userList对应的适配器
SimpleAdapter simpleAdapter = null;
//用户列表userList对应的适配器的数据源
List<Map<String,?>> dataSimpleAdapter = new ArrayList<Map<String,?>>();
//用户列表ListView行布局元素
int[] userListViewTo = null;
//用户列表ListView行布局元素对应的适配器key值
String[] userListViewFrom = null;

    /**
     * 初始化用户列表组件适配器.
     */
    public void initUserListViewAdapter(){
        userList = (ListView)findViewById(R.id.user_list_users);        
        userListViewTo = new int[]{R.id.user_list_item_user_id,
                R.id.user_list_item_user_Login_id,
                R.id.user_list_item_user_login_pass};
        
        int len = userListViewTo.length;
        userListViewFrom = new String[len];
        for(int i=0;i<len;i++){
            userListViewFrom[i]=String.valueOf(i);
        }
    } 

    /**
     * 显示ListView组件.
     */
    public void showListView(){
        //用户列表ListView布局文件
        int resource = R.layout.user_list_item;
        //准备适配器数据源
        createAdapterData();
        //绑定适配器并返回
        simpleAdapter = new SimpleAdapter(context, dataSimpleAdapter, resource, userListViewFrom, userListViewTo);
        //设置ListView组件的适配器.
        userList.setAdapter(simpleAdapter);
    }

    /**
     * 生成适配器数据源
     * @param itemCount
     */
    public void createAdapterData(){
        //准备适配器内容
        dataSimpleAdapter.clear();//确保数据源是空的
        int itemLength = 3;
        
        for(int i=0;i<itemLength;i++){
            Map<String,Object> map = new HashMap<String,Object>();
            map.put(userListViewFrom[0], "数据列1-"+i);
            map.put(userListViewFrom[1], "数据列2-"+i);
            map.put(userListViewFrom[2], "数据列3-"+i);
            dataSimpleAdapter.add(map);
        }
    } 

//刷新listview
simpleAdapter.notifyDataSetChanged();