ArrayAdapter ,SimpleAdapter ,SimpleCursorAdapter 区别

转载

witer666 2013-01-13 18:12:00

数据源不同而已
1. String[]: ArrayAdapter
2. List<Map<String,?>>: SimpleAdapter
3. 数据库Cursor: SimpleCursorAdapter

使用ArrayAdapter（数组适配器）顾名思义，需要把数据放入一个数组以便显示。
android.R.layout.simple_list_item_1是系统定义好的布局文件只显示一行文字

SimpleAdapter能定义各种各样的布局出来，可以放上ImageView（图片），还可以放上Button（按钮），CheckBox（复选框）

//=============================SimpleAdapter==========================

public class List3 extends ListActivity {

List<Map<String, Object>> list;

@Override
public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);

   list = getListForSimpleAdapter(); //list为数据集合

   SimpleAdapter    adapter = new SimpleAdapter(this, list,
R.layout.item,
   new String[] { "BigText", "LittleText", "img" },
new int[] { R.id.BigText,R.id.LittleText, R.id.img });

      //可以想成把一个放好数据的布局文件放入本界面中
   setListAdapter(adapter);

}

private List<Map<String, Object>> getListForSimpleAdapter() {
List<Map<String,Object>> list=newArrayList<Map<String,       Object>>(3);
         Map<String, Object> map = new HashMap<String, Object>();
         map.put("BigText", "Android");
         map.put("LittleText", "Google phone.");
         map.put("img", R.drawable.n);
         list.add(map);

         map = new HashMap<String, Object>();
         map.put("BigText", "Lenovo");
         map.put("LittleText", "Ophone");
         map.put("img", R.drawable.o);
         list.add(map);

         map = new HashMap<String, Object>();
         map.put("BigText", "Droid");
         map.put("LittleText", "Motorola");
         map.put("img", R.drawable.droid);
         list.add(map);


   return list;
}
}

//==============================SimpleCursorAdapter===================

注意：SimpleCursorAdapter是和数据库有关的东西，而sqlite数据库所要求的自动增长的 id  必须是 _id这中形式

public class List2 extends Activity {

private ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);

      listView=new ListView(this);
   Cursorc=getContentResolver().query(People.CONTENT_URI,
   null, null, null, null);
      startManagingCursor(c);

      ListAdapter adapter = new SimpleCursorAdapter(this,
               android.R.layout.simple_list_item_1,
               c,
               new String[] {People.NAME} ,
               new int[] {android.R.id.text1});
      listView.setAdapter(adapter);
setContentView(listView);
}
}