writing multiple alarms, alarm manager overrides them?

Question

I'm extremely confused as to why when I first set an alarm it goes off, then i try to set it again and it doesn't. BUT the THIRD time it works, and so does the 5th,7th,9th etc... so every 2 times i set the alarm it works. I'm thoroughly confused because I gave my pending intent a uniqID specifically so this doesn't happen but maybe somewhere else I messed up..?

setAlarm.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View arg0) {
                AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE); 

                myCal.set(Calendar.YEAR, datePicker.getYear());
                myCal.set(Calendar.MONTH, datePicker.getMonth());
                myCal.set(Calendar.DAY_OF_MONTH, datePicker.getDayOfMonth());
                myCal.set(Calendar.HOUR, timePicker.getCurrentHour());
                myCal.set(Calendar.MINUTE, timePicker.getCurrentMinute());
                myCal.set(Calendar.SECOND, 0);

                //precaution if the user restarts their phone. Saves the alarm to a file
                //and when user restarts their phone register a broadcast receiver to pick up
                //the broadcast and then re-create the alarms that were stored. 
                setAlarms(datePicker.getYear(), datePicker.getMonth(), datePicker.getDayOfMonth()
                        , timePicker.getCurrentHour(), timePicker.getCurrentMinute(), assignmentName);

                Intent triggered = new Intent(ManageAlarms.this, alarms.DisplayNotification.class);
                triggered.putExtra("NotificationId", 1);
                triggered.putExtra("assignmentName", assignmentName);

                PendingIntent displayIntent = PendingIntent.getActivity(
                        ManageAlarms.this, counter, triggered, PendingIntent.FLAG_ONE_SHOT);

                /*boolean alarmActive = (PendingIntent.getActivity(getBaseContext(), 0,
                        triggered, PendingIntent.FLAG_NO_CREATE) != null);

                if (alarmActive) {
                    alarmManager.cancel(displayIntent);
                }*/

                alarmManager.set(AlarmManager.RTC_WAKEUP, 
                        myCal.getTimeInMillis(), displayIntent);
                counter++;

Answer 1

According to the documentation, the Pending Intent in "Alarm Set" should be a Broadcast Receiver(See here). I recommend the following:

Replace

PendingIntent displayIntent = PendingIntent.getActivity(
                        ManageAlarms.this, counter, triggered, PendingIntent.FLAG_ONE_SHOT);

with

PendingIntent displayIntent = PendingIntent.getBroadcast(
                        ManageAlarms.this, counter, triggered, PendingIntent.FLAG_ONE_SHOT);

The DisplayNotification class should extend BroadcastReceiver and implement onReceive().