使用ContentObserver监听数据库变化

 public class ScreenTest extends Activity {

     class SmsContent extends ContentObserver{
         private Cursor cursor = null;
         public SmsContent(Handler handler) {
             super(handler);
         }

         /**
          * @Description 当短信表发送改变时，调用该方法
          *              需要两种权限
          *              android.permission.READ_SMS读取短信
          *              android.permission.WRITE_SMS写短信
          * @Author Snake
          * @Date 2010-1-12
          */
         @Override
         public void onChange(boolean selfChange) {
             // TODO Auto-generated method stub
             super.onChange(selfChange);
             //读取收件箱中指定号码的短信
             cursor = managedQuery(Uri.parse("content://sms/inbox"), new String[]{"_id", "address", "read"}, " address=? and read=?", new String[]{"12345678901", "0"}, "date desc");

             if (cursor != null){
                 ContentValues values = new ContentValues();
                 values.put("read", "1");        //修改短信为已读模式
                 cursor.moveToFirst();
                 while (cursor.isLast()){
                     //更新当前未读短信状态为已读
                     getContentResolver().update(Uri.parse("content://sms/inbox"), values, " _id=?", new String[]{""+cursor.getInt(0)});
                     cursor.moveToNext();
                 }
             }
         }
     }

     /** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         SmsContent content = new SmsContent(new Handler());
         //注册短信变化监听
         this.getContentResolver().registerContentObserver(Uri.parse("content://sms/"), true, content);
     }
 }