Android Service action is delayed-CodePudding

I am working on an alarm clock where the alarm is received by a receiver that starts a service. In that service, I start a ForegroundService. Then a Handler with a 60s delay start the alarm sound. The problem is, that sometimes the notification and the sound start 1 minute too late. The receiver and the service start at the right time, but the notification and sound don't. I already tried to replace the Handler, but it didn't work.

AlarmService:

override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {    

  val notificationChannel : NotificationChannel
  val notificationBuilder : Notification.Builder
  val channelId = "alarm"
  val description = resources.getString(R.string.alarms)

  val notificationManager = this.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

  val alarmScreen = Intent(this, AlarmScreen::class.java)
  alarmScreen.putExtra("alarmNumber", alarmNumber)
  val alarmScreenPendingIntent = PendingIntent.getActivity(this, 5000, alarmScreen, 0)

  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        notificationChannel = NotificationChannel(channelId, description, NotificationManager.IMPORTANCE_HIGH)
        notificationChannel.enableVibration(false)
        notificationChannel.setSound(null, null)
        notificationManager.createNotificationChannel(notificationChannel)

        notificationBuilder = Notification.Builder(this, channelId)
              .setContentTitle(resources.getString(R.string.alarm))
              .setContentText(resources.getString(R.string.clickToOpenAlarmScreen))
              .setSmallIcon(R.drawable.logo_alarm)
              .setLargeIcon(BitmapFactory.decodeResource(this.resources, R.drawable.logo_alarm))
              .setContentIntent(alarmScreenPendingIntent)
              .setCategory(NotificationCompat.CATEGORY_ALARM)
              .setFullScreenIntent(alarmScreenPendingIntent, true)}

  else{
        notificationBuilder = Notification.Builder(this)
              .setContentTitle(resources.getString(R.string.alarms))
              .setContentText(resources.getString(R.string.clickToOpenAlarmScreen))
              .setSmallIcon(R.drawable.logo_alarm)
              .setLargeIcon(BitmapFactory.decodeResource(this.resources, R.drawable.logo_alarm))
              .setContentIntent(alarmScreenPendingIntent)
              .setCategory(NotificationCompat.CATEGORY_ALARM)
              .setFullScreenIntent(alarmScreenPendingIntent, true)}


  startForeground(1000, notificationBuilder.build())


  fun Activity.turnScreenOnAndKeyguardOff() {
       if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
           setShowWhenLocked(true)
           setTurnScreenOn(true)
       } else {
           window.addFlags(
              WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
                       or WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
                )
            }

       with(getSystemService(Context.KEYGUARD_SERVICE) as KeyguardManager) {
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                    requestDismissKeyguard(this@turnScreenOnAndKeyguardOff, null)
                }}}

  Handler(Looper.getMainLooper()).postDelayed({
      AlarmSound.playAlarm(applicationContext) //Starts the alarm sound object 
  }, 60000)


  return START_STICKY

}

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