Android 开发之 ArrayAdapter ,SimpleAdapter ,SimpleCursorAdapter 差异

Android 开发之 ArrayAdapter ,SimpleAdapter ,SimpleCursorAdapter 区别
1. String[]: ArrayAdapter


2. 数据库 Cursor: SimpleCursorAdapter
3. List<Map <String,?>>: SimpleAdapter



ArrayAdapter 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


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


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）


Arrayadapter代码

1.public class List1 extends   Activity {     
2.

3.     private ListVeiw listView;     
4.     @Override    
5.     public void onCreate(Bundle savedInstanceState) {     
6.    super.onCreate(savedInstanceState);     
7.

8.        listView=new ListVeiw(this);     
9.        listView.setAdapter(new ArrayAdapter<String>(this,     
10.            android.R.layout.simple_list_item_1, mStrings));     
11.       setContentVieww(listView);     
12.         }     
13.

14.    private String[] mStrings = {     
15.
"Abbaye de Belloc", "Abbaye du Mont des Cats",        
16.
"Acorn", "Adelost", "Affidelice au Chablis",     
17.
"Aisy Cendre", "Allgauer Emmentaler", "Alverca",     
18.
"Ami du Chambertin", "Anejo Enchilado", "Anneau     
19.
"Aragon", "Ardi Gasna", "Ardrahan", "Armenian     
20.
"Asadero", "Asiago", "Aubisque Pyrenees", "Autun",     
21.
"Babybel", "Baguette Laonnaise", "Bakers", "Bal"};     
22.} 


Simplecursoradapter代码

1.public class List2 extends Activity {     
2.

3.     private ListView listView;     
4.     @Override    
5.     protected void onCreate(Bundle savedInstanceState) {     
6.         super.onCreate(savedInstanceState);     
7.

8.         listView=new ListView(this);     
9.        Cursorc=getContentResolver().query(People.CONTENT_URI,     
10.        null, null, null, null);           
11.         startManagingCursor(c);     
12.

13.         ListAdapter adapter = new SimpleCursorAdapter(this,     
14.                  android.R.layout.simple_list_item_1,     
15.                  c,     
16.                  new String[] {People.NAME} ,     
17.                  new int[] {android.R.id.text1});     
18.         listView.setAdapter(adapter);     
19.setContentView(listView);     
20.}     
21.}   


Simpleadapter代码

1.public class List3 extends ListActivity {     
2.

3.     List<Map<String, Object>> list;     
4.

5.     @Override    
6.     public void onCreate(Bundle savedInstanceState) {     
7.        super.onCreate(savedInstanceState);     
8.

9.        list = getListForSimpleAdapter(); //list为数据集合  
10.

11.        SimpleAdapter      adapter = new SimpleAdapter(this, list,     
12.R.layout.item,     
13.        new String[] { "BigText", "LittleText", "img" },     
14.new int[] { R.id.BigText,R.id.LittleText, R.id.img });    
15.

16.         //可以想成把一个放好数据的布局文件放入本界面中     
17.        setListAdapter(adapter);        
18.

19.     }     
20.

21.     private List<Map<String, Object>> getListForSimpleAdapter() {     
22.     List<Map<String,Object>> list=newArrayList<Map<String,         Object>>(3);     
23.            Map<String, Object> map = new HashMap<String, Object>();     
24.            map.put("BigText", "Android");     
25.            map.put("LittleText", "Google phone.");     
26.            map.put("img", R.drawable.n);     
27.            list.add(map);     
28.

29.            map = new HashMap<String, Object>();     
30.            map.put("BigText", "Lenovo");     
31.            map.put("LittleText", "Ophone");     
32.            map.put("img", R.drawable.o);     
33.            list.add(map);     
34.

35.            map = new HashMap<String, Object>();     
36.            map.put("BigText", "Droid");     
37.            map.put("LittleText", "Motorola");     
38.            map.put("img", R.drawable.droid);     
39.            list.add(map);     
40.

41.

42.        return list;     
43.     }     
44.}