怎么监听短信会话（对话）的删除

/*用户使用系统自带的短信程序发送短信，程序会把短信通过ContentProvider保存进数据库，并且发出一个数据变化通知，只要使用ContentObserver对数据变化进行监听，在用户发送短信时，就会被ContentObserver窃听到：注册监听：getContentResolver().registerContentObserver(Uri.parse("content://sms"),  true, new SmsObserver(new Handler()));监听类：*/private final class SmsObserver extends ContentObserver{    public SmsObserver(Handler handler) {        super(handler);    }    public void onChange(boolean selfChange) {//查询发送箱中的短信(处于正在发送状态的短信放在发送箱)        Cursor cursor = getContentResolver().query(Uri.parse("content://sms/outbox"),null, null, null, null);         while(cursor.moveToNext()){            StringBuilder sb = new StringBuilder();            sb.append("_id=").append(cursor.getInt(cursor.getColumnIndex("_id")));            sb.append(",address=").append(cursor.getString(cursor.getColumnIndex("address")));            sb.append(";body=").append(cursor.getString(cursor.getColumnIndex("body")));            sb.append(";time=").append(cursor.getLong(cursor.getColumnIndex("date")));            Log.i("ReceiveSendSMS", sb.toString());                 } }        }
------解决方案--------------------
 getContentResolver().delete(Uri.parse("content://sms/conversations/" + groupId), null, null);