Android SimpleAdapter，SimpleCursorAdapter，ArrayAdapter的區別

資料來源不同而已
1. String[]: ArrayAdapter
2. List<Map<String,?>>: SimpleAdapter
3. 資料庫Cursor: SimpleCursorAdapter

使用ArrayAdapter（數組適配器）顧名思義，需要把資料放入一個數組以便顯示。
android.R.layout.simple_list_item_1是系統定義好的布局檔案只顯示一行文字

SimpleAdapter能定義各種各樣的布局出來，可以放上ImageView（圖片），還可以放上Button（按鈕），CheckBox（複選框）

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

public class List3 extends ListActivity {

List<Map<String, Object>> list;

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

list = getListForSimpleAdapter(); //list為資料集合

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 });

//可以想成把一個放好資料的布局檔案放入本介面中
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是和資料庫有關的東西，而sqlite資料庫所要求的 自動成長的 id  必須是 _id這中形式

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);
}
}

//====================ArrayAdapter===================================

public class List1 extends  Activity {

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

listView=new ListVeiw(this);
listView.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, mStrings));
setContentVieww(listView);
}

private String[] mStrings = {
“Abbaye de Belloc”, “Abbaye du Mont des Cats”,
“Acorn”, “Adelost”, “Affidelice au Chablis”,
“Aisy Cendre”, “Allgauer Emmentaler”, “Alverca”,
“Ami du Chambertin”, “Anejo Enchilado”, “Anneau
“Aragon”, “Ardi Gasna”, “Ardrahan”, “Armenian
“Asadero”, “Asiago”, “Aubisque Pyrenees”, “Autun”,
“Babybel”, “Baguette Laonnaise”, “Bakers”, “Bal”};
}