android ListView详解

核心提示：SimpleCursorAdaptersdk的解释是这样的：An easy adapter to map columns from a cursor to TextViews or ImageViews defined in an XML file. You can specify which columns you

SimpleCursorAdapter

sdk的解释是这样的：An easy adapter to map columns from a cursor to TextViews or ImageViews defined in an XML file. You can specify which columns you want, which views you want to display the columns, and the XML file that defines the appearance of these views。简单的说就是方便把从游标得到的数据进行列表显示，并可以把指定的列映射到对应的TextView中。

下面的程序是从电话簿中把联系人显示到类表中。先在通讯录中添加一个联系人作为数据库的数据。然后获得一个指向数据库的Cursor并且定义一个布局文件(当然也可以使用系统自带的)。

view sourceprint?01/**

02 * @author allin

03 *

04 */

05public class MyListView2 extends Activity {

06

07 private ListView listView;

08 //private List data = new ArrayList();

09 @Override

10 public void onCreate(Bundle savedInstanceState){

11 super.onCreate(savedInstanceState);

12

13 listView = new ListView(this);

14

15 Cursor cursor = getContentResolver().query(People.CONTENT_URI, null, null, null, null);

16 startManagingCursor(cursor);

17

18 ListAdapter listAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_expandable_list_item_1,

19 cursor,

20 new String[]{People.NAME},

21 new int[]{android.R.id.text1});

22

23 listView.setAdapter(listAdapter);

24 setContentView(listView);

25 }

26

27

28}

Cursor cursor = getContentResolver().query(People.CONTENT_URI, null, null, null, null);先获得一个指向系统通讯录数据库的Cursor对象获得数据来源。

startManagingCursor(cursor);我们将获得的Cursor对象交由Activity管理，这样Cursor的生命周期和Activity便能够自动同步，省去自己手动管理Cursor。