String ns = Context.NOTIFICATION_SERVICE;
        NotificationManager mNotificationManager = (NotificationManager) this.getSystemService(ns);
        int icon = R.drawable.ic_launcher;
        CharSequence tickerText = title;
        long when = System.currentTimeMillis();             


        Uri alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        if(alarmSound == null){
              alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);
            if(alarmSound == null){
                alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            }
        }           

        Intent intent = new Intent();
        PendingIntent pendingIntent 
        = PendingIntent.getActivity(this,intent,0);    

        NotificationCompat.BigTextStyle bigxtstyle =
        new NotificationCompat.BigTextStyle();          
        bigxtstyle.bigText(text);               
        bigxtstyle.setBigContentTitle(title);


        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this)
            .setStyle(bigxtstyle)
            .setSmallIcon(icon)
            .setAutoCancel(true)

            .setSound(alarmSound)
            .setDeleteIntent(pendingIntent)                     
            .setContentIntent(PendingIntent.getActivity(this,new Intent(),0));     


        Notification noti = mBuilder.build();


        mNotificationManager.notify(notificationid++,noti);

此代码有效,并显示通过自动换行宣传的文本.但是,当后续通知发生时,先前的通知会丢失其文本.有人可以帮忙解决这个问题吗？这可能是我设置错误的东西,我是android apis的新手.