listView传递数据

listView= (ListView) this.findViewById(R.id.listview); 
            List<HashMap<String,String>>data = new ArrayList<HashMap<String,String>>(); 
            UserService us = new UserService(this); 
            List<User> users = us.getScrollDate(0, 10); 
            for(User u : users){ 
             HashMap<String,String> map = new HashMap<String, String>(); 
             map.put("userid", String.valueOf(u.getUserid())); 
             map.put("name", u.getName()); 
             map.put("age", String.valueOf(u.getAge())); 
             data.add(map); 
            } 
            SimpleAdapter adapter = new SimpleAdapter(this,data,R.layout.useritem,new String[]{"userid","name","age"},new int[]{R.id.userid,R.id.name,R.id.age}); 
             
           listView.setAdapter(adapter); 
            listView.setOnItemClickListener(new OnItemClickListener(){ 
     
       @SuppressWarnings("unchecked") 
       @Override 
       public void onItemClick(AdapterView<?> parent, View view, 
         int position, long id) { 
        ListView listView = (ListView)parent; 
        HashMap<String, String> map = (HashMap<String, String>) listView.getItemAtPosition(position); 
        String userid = map.get("userid"); 
        String name = map.get("name"); 
        String age = map.get("age"); 
        Toast.makeText(SQLiteCRUDActivity.this, userid +" , "+ name +" , "+ age ,Toast.LENGTH_LONG).show(); 
       } 
            });