ContentObserver 用法

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);
    }
}