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Android:为什么在系统重启后警报通知会停止

我正在开发一个Android应用程序,它应该每天发出五次警报:
- 每天的时间不是恒定的
- 警报发出后我将安排下一次警报.

我的问题是:警报通知工作1天然后它停止,并且当设备重新启动两次通知不起作用,我现在不,如果还有另一种方法,任何帮助将非常感谢!

代码:我有这个功能来调用广播接收器

public static void Start_Notifying(Context context){             
    Calendar cal = Calendar.getInstance();
    cal.setTimeInMillis(System.currentTimeMillis());
    cal.add(Calendar.HOUR_OF_DAY,hour);
    cal.add(Calendar.MINUTE, min);      
    Intent intent = new Intent(context,  OnetimeAlarmReceiver.class);
    intent.setAction("START_NOTIFYING");
    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, notify.REQUEST_CODE, intent,0);
    AlarmManager alarmManager = (AlarmManager) context.getSystemService(ALARM_SERVICE);
    alarmManager.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis() , pendingIntent); 
    SaveAlarmManager(alarmManager, pendingIntent);

}
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oneTimeAlarmReciever的代码

public void onReceive(Context context, Intent intent) {     
    main_menu.con = context;                
    Notification notifyDetails;
    NotificationManager nm = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
    notifyDetails = new Notification(R.drawable.icon,s1,System.currentTimeMillis());
    PendingIntent pendingIntent = PendingIntent.getActivity(context, REQUEST_CODE, new Intent(context, prayertimes.class), 0);
    notifyDetails.setLatestEventInfo(context,s2+ notify.prayName , s3, pendingIntent); …
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android broadcastreceiver android-manifest alarmmanager android-alarms

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