此Adapter(SimpleCursorAdapter)是Android專門為了連接數(shù)據(jù)庫(kù)與視圖而產(chǎn)生的.此例中借助ListView體現(xiàn)SimpleCursorAdapter的用法。因?yàn)?，ListView在android中是比較常用的視圖組件，不論是靜態(tài)還是動(dòng)態(tài)都可以在其上顯示。當(dāng)然，在實(shí)際的android項(xiàng)目中需要顯示的數(shù)據(jù)一般都是動(dòng)態(tài)從數(shù)據(jù)庫(kù)表中獲取的。而SimpleCursorAdapter就是將從數(shù)據(jù)庫(kù)表中獲取的數(shù)據(jù)顯示到ListView的橋梁。

         在做的時(shí)候，可以將SimpleCursorAdapter與前面的SimpleCursorAdapter進(jìn)行對(duì)比一下，你會(huì)發(fā)現(xiàn)二者的使用非常相似：

          1.在new xxxAdapter時(shí)候, 如下 ,紅色字體，

               SimpleCursorAdapter adapter = new SimpleCursorAdapter(

                                                                                                  this,

                                                                                                  android.R.layout.simple_expandable_list_item_1,

                                                                                                  cursor,

                                                                                                  new String[]{People.NAME},

                                                                                                  new int[]{android.R.id.text1}

              );
              SimpleAdapter adapter = new SimpleAdapter(

                                                                                       this,

                                                                                       allInfos ,

                                                                                       R.layout.simple_adapter_view,

                                                                                       new String[]{"img","name","phone","region"},

                                                                                       new int[]{R.id.info_img,R.id.info_name,R.id.info_phone,R.id.info_region}

 紅色字體部分，即二者的數(shù)據(jù)源類型不同，SimpleCursorAdapter 的數(shù)據(jù)源是一個(gè)從數(shù)據(jù)庫(kù)表中查詢出來(lái)的數(shù)據(jù)集合cursor；而SimpleAdapter的數(shù)據(jù)源allInfos 是list集合(當(dāng)然也可以是數(shù)組等)，可以看到一個(gè)是動(dòng)態(tài)一個(gè)是靜態(tài)的數(shù)據(jù)。

 

這里使用的SimpleCursorAdapter只是一個(gè)簡(jiǎn)單的例子，用的是系統(tǒng)表，當(dāng)然你可以自己建立一個(gè)表應(yīng)用在此例中，activity代碼：

public class SimpleCursorAdapterTest extends Activity{
 private ListView listView;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
                 super.onCreate(savedInstanceState);
                 listView = new ListView(this);
                 Cursor myCursor = getContentResolver().query(People.CONTENT_URI, null, null, null, null);//是系統(tǒng)里的表
                 startManagingCursor(myCursor);
                 ListAdapter listAdapter = new SimpleCursorAdapter(

                                                                                                   this, //上下文

                                                                                                   android.R.layout.simple_expandable_list_item_1, //要顯示的listview的樣式

                                                                                                   myCursor, //數(shù)據(jù)源

                                                                                                   new String[]{People.NAME}, //所對(duì)應(yīng)的字段

                                                                                                   new int[]{android.R.id.text1}   //上面的字段顯示在界面上的那個(gè)控件

                 );
                 listView.setAdapter(listAdapter);
                 setContentView(listView);
 }
}

       值得注意的一點(diǎn)，不要忘了在AndroidManifest.xml文件中聲明訪問(wèn)系統(tǒng)表的權(quán)限：<uses-permission android:name="android.permission.READ_CONTACTS"/>