Multiple alarms at the same time in Android

问题

I'm stuck on this problem. I've read many solutions on stack overflow but none of these have solved my problem.

Here's my code: In my Main Activity, I wrote this--

    this.context = this;
    Intent alarm = new Intent(this.context, AlarmManager.class);
    boolean alarmRun = (PendingIntent.getBroadcast(this.context,0,alarm, PendingIntent.FLAG_NO_CREATE) != null);
    if (alarmRun == false){
          PendingIntent pending = PendingIntent.getBroadcast(this.context, 0, alarm, 0);
          AlarmManager alarmMgr = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
                    alarmMgr.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime(), 15000, pending);
            }

So the first time the app is opened a Broadcast Receiver is called which is the AlarmManager.java. Here's what I did in my Alarm Manager: In my onReceive--

AlarmDB db = new AlarmDB (context);

List<Alarm> alarms = db.getAlarm();

if(alarms != null)
{
    for (Alarm alarm : alarms)
    {
         Calendar calendar = Calendar.getInstance();
         final int nowHour = Calendar.getInstance().get(Calendar.HOUR_OF_DAY);
         final int nowMinute = Calendar.getInstance().get(Calendar.MINUTE);
         final int nowDay = Calendar.getInstance().get(Calendar.DAY_OF_WEEK);

         calendar.set(Calendar.HOUR_OF_DAY, Integer.parseInt(alarm.getAlarmHour()));
         calendar.set(Calendar.MINUTE, Integer.parseInt(alarm.getStartTimeMinute()));
         calendar.set(Calendar.SECOND, 00);

          PendingIntent pIntent = createPendingIntent(context, alarm);

          if (!(Integer.parseInt(alarm.getAlarmHour()) < nowHour) && !(Integer.parseInt(alarm.getAlarmHour()) == nowHour && Integer.parseInt(alarm.getStartTimeMinute()) <= nowMinute)) 
          {
                 AlarmManager alarmMgr = (AlarmManager)c.getSystemService(Context.ALARM_SERVICE);
                 if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) 
                 {
                       alarmMgr.setExact(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pIntent);
                  } else {
                        alarmMgr.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pIntent);
                  }
          }
      }
}

And here's the createPendingIntent method I separately made:

private static PendingIntent createPendingIntent(Context context, Alarm m) {
        Intent i = new Intent(context, AlarmService.class);
        i.putExtra(ID, m.getID());
        i.putExtra(NAME, m.getMedName());

        return PendingIntent.getService(context, m.getID(), i, PendingIntent.FLAG_UPDATE_CURRENT);
    }

So everytime the current time matches the time from the database an intent is fired through a service which is in my AlarmManager activity. Notice that in calling the getService, the request code is the unique id from database. My problem is eventhough I am using a unique id, everytime there is 2 or more alarm to be fired at the same time only one of those is sucessfully fired. So how should I do this?

回答1:

if (alarmRun == false){
          PendingIntent pending = PendingIntent.getBroadcast(this.context, 0, alarm, 0);
          AlarmManager alarmMgr = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
                    alarmMgr.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime(), 15000, pending);
            }

Calling setRepeating will cause the BroadcastReceiver to be triggered multiple times at an interval of 15000 milliseconds. Use setExact instead.

来源：https://stackoverflow.com/questions/35402229/multiple-alarms-at-the-same-time-in-android

标签

android

android-alarms