android 通知（ notification.sound）声音为什么一直不停的叫？如何只叫两次？

builder.setContentTitle("新任务"+mNotificationNum);//设置通知标题builder.setContentText("不要放孔明... builder.setContentTitle("新任务"+mNotificationNum);//设置通知标题
builder.setContentText("不要放孔明灯，容易起火"+mNotificationNum);//设置通知内容
// builder.setDefaults(NotificationCompat.DEFAULT_ALL);//设置通知的方式，震动、LED灯、音乐等

//实例化通知管理器
NotificationManager notificationManager= (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
//实例化通知
NotificationCompat.Builder builder=new NotificationCompat.Builder(this);
builder.setAutoCancel(true);//点击通知后，状态栏自动删除通知
builder.setSmallIcon(android.R.drawable.ic_media_play);//设置小图标
Vibrator vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);
vibrator.vibrate(new long[] {0,1000,500,2000}, -1);//实现效果：延迟0ms，然后振动1000ms，在延迟500ms，接着在振动2000ms。-1表示不重复, 如果不是-1, 比如改成1,
builder.setDefaults(Notification.DEFAULT_SOUND);//获取默认铃声

// builder.setSound(Uri.parse( "android.resource://" + getPackageName() + "/" + R.raw.notificationsound ));//获取自定义铃声
// builder.setSound( RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION));
// builder.setSound(Uri.withAppendedPath(MediaStore.Audio.Media.INTERNAL_CONTENT_URI, "0"));//获取Android多媒体库内的铃声
builder.setPriority(Notifi.PRIcationORITY_MAX);
builder.setContentIntent(PendingIntent.getActivity(this,mNotificationNum,new Intent(this,MainActivity.class),PendingIntent.FLAG_CANCEL_CURRENT));//设置点击通知后将要启动的程序组件对应的PendingIntent
Notification notification=builder.build();
notification.flags = Notification.DEFAULT_LIGHTS;// 添加默认三色灯提醒
//发送通知
notificationManager.notify(mNotificationNum,notification); 展开

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