android prevent immediate trigger of alarm service if alarm time has passed for the day

Question

The reference for Alarm Manager says that

If the stated trigger time is in the past, the alarm will be triggered immediately.

I am facing this problem in my application. Here is my alarm manager code :

Intent myIntent = new Intent(getActivity(), DinnerAlarmReceiver.class);
                pendingDinnerIntent = PendingIntent.getBroadcast(getActivity(), 0, myIntent, 0);

                Calendar calendar = Calendar.getInstance();
                calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
                calendar.set(Calendar.MINUTE, minute);

                alarmManager.set(AlarmManager.RTC_WAKEUP,
                        calendar.getTimeInMillis(), pendingDinnerIntent);

Is there any workaround to this problem?

-----EDIT------

I have written some code to estimate if the set time for the alarm is before the current time . Here is the above portion with corresponding changes :

Calendar calendar = Calendar.getInstance();
                long currentTime = calendar.getTimeInMillis();
                calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
                calendar.set(Calendar.MINUTE, minute);
                long setTime = calendar.getTimeInMillis();
                Timestamp setTimestamp = new Timestamp(setTime);
                Timestamp currentTimestamp = new Timestamp(currentTime);
                if (setTimestamp.after(currentTimestamp))
                {
                    alarmManager.set(AlarmManager.RTC_WAKEUP,
                            calendar.getTimeInMillis(), pendingDinnerIntent);
                }
                else
                {
                }

What should I the alarmManager to in case setTimestamp is before currentTimestamp ?

Hogback

Answer 1

You don't need to create Timestamps. You can do it with your Calendar.

Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
calendar.set(Calendar.MINUTE, minute);

if(calendar.before(Calendar.getInstance())) {
    calendar.add(Calendar.DATE, 1);
}

alarmManager.set(AlarmManager.RTC_WAKEUP,
    calendar.getTimeInMillis(), pendingDinnerIntent);

I would also mention that as of KitKat, if your targetSdkVersion is 19 or above, the AlarmManager#set() method is not exact. If you want your alarm to fire at an exact time, you'll need to use a setExact*() method.

Margherita

setExact() wont work for Repeating alarm. – Photolysis

Right, 'cause it's not a repeating alarm. All alarms figure the start times the same way, though, depending on the chosen clock. – Margherita