Android开发教程：ListView使用SimpleAdapter适配器

public class TryChatPopActivity extends Activity {       ListView itemlist = null;       List<Map<String, Object>> list;          public void onCreate(Bundle savedInstanceState) {               super.onCreate(savedInstanceState);               setContentView(R.layout.main);               itemlist = (ListView) findViewById(R.id.chatlist);               refreshListItems();       }       private void refreshListItems() {               list = buildListForSimpleAdapter();               //实例适配器                SimpleAdapter chat = new SimpleAdapter(this, list, R.layout.chata,                               new String[] {"chatportrait","chatinfo"}, new int[] {R.id.imgPortraitA,R.id.txvInfo});               itemlist.setAdapter(chat);               itemlist.setSelection(0);       }              //用来实例化列表容器的函数        private List<Map<String, Object>> buildListForSimpleAdapter() {               List<Map<String, Object>> list = new ArrayList<Map<String, Object>>(2);               ImageView  imgA=(ImageView)findViewById(R.id.imgPortraitA);               //向列表容器中添加数据（每列中包括一个头像和聊天信息）                Map<String, Object> map = new HashMap<String, Object>();               map.put("chatportrait",imgA);               map.put("chatinfo", "嗨~");               list.add(map);                              map = new HashMap<String, Object>();               map.put("chatportrait",imgA);               map.put("chatinfo", "嗨~\n你好！");               list.add(map);                  map = new HashMap<String, Object>();               map.put("chatportrait",imgA);               map.put("chatinfo", "嗨~\n你好！\n我是小魏~");               list.add(map);                              return list;       }   }