Develop Reference

Daily alarm not triggered after 2 or 3 days

I want to trigger a daily alarm in my application. I can see the alarm being triggered daily at the correct time for 2 or 3 days but it does not trigger after that. For example if I set alarm to trigger at 08:00 AM, it will trigger at 8 AM daily for 2 or 3 days and after that there is no alarm triggered. There is no app crashing or anything, it simply does not trigger. I have a BroadcastReceiver registered (in AndroidManifest.xml) for this alarm and i can see logs being printed daily at the correct time but only for 2 or 3 days. After that there is no activity and the app just seems to die down.
Please find my code below :
final AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
final long intervalDay = 60*60*24*1000L;
final long alarmTime = calendar.getTimeInMillis();
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, alarmTime, intervalDay, pendingIntent);
I have also used alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, alarmTime, AlarmManager.INTERVAL_DAY, pendingIntent); but it did not make any difference (didnt expect it to make any though).
I do not want to use alarmManager.setInexactRepeating() as it does not trigger the alarm at exact time but there is slight delay.
Any help appreciated !!
Thanks.

That's because android cannot hold the alarm content for more than 2-3 days. Though there is no sure shot solution that i know.
I fixed it by cancelling and resetting alarm everytime alarm is triggered.
Something like this.
Instead of using setRepeat use set or setExact to trigger for once:
if(android.os.Build.VERSION.SDK_INT<Build.VERSION_CODES.KITKAT) {
alarmManager.set(AlarmManager.RTC_WAKEUP, alarmtime, pendingIntent);
} else {
alarmManager.setExact(AlarmManager.RTC_WAKEUP, alarmtime, pendingIntent);
}
Then in onRecieve() method of your alarmReciever after performing your task, reset the alarm again for next followed by cancelling all pending intents:
PendingIntent pendingIntent = PendingIntent.getBroadcast(context.getApplicationContext(), reminderModal.get_remindID(), intent, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarmManager = (AlarmManager) context.getApplicationContext().getSystemService(Context.ALARM_SERVICE);
alarmManager.cancel(pendingIntent);
pendingIntent.cancel();
Hope it helps.

How to set android alarm to trigger until an specific date

I'm new to android and using alarmManager and I was wondering if there is a way to set an alarm in android that triggers for example every monday until a certain specific date. Like this :
Start date 10/09/15
Remind me something every monday at 2:30 pm
Until
End date 11/09/15

AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, 14);
calendar.set(Calendar.MINUTE, 30);
int weekInMillis = 7 * 24 * 60 * 60 * 1000;
alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
weekInMillis, PendingIntent.getBroadcast(context, 0, new Intent(context, ReminderAlarmWakefulBroadcastReceiver.class), PendingIntent.FLAG_UPDATE_CURRENT));
Above code snippet sets an alarm for 2:30 PM that repeats itself every week. Tweak calendar for varying the time at which the alarm goes off. For example, the coming Monday.
When the alarm goes off, it sends a broadcast which will be received by ReminderWakefulBroadcastReceiver, a custom receiver containing the code that you want to run every Monday at 2:30 PM. This code should also check whether it is time to cancel the alarm and if it is, the following code cancels it:
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
alarmManager.cancel(PendingIntent.getBroadcast(context, 0, new Intent(context, ReminderAlarmWakefulBroadcastReceiver.class));
References:
AlarmManager, Scheduling Repeating Alarms, PendingIntent

If you know how to setup an Alarm, the solution is quite simple:
1) At the time you setup the Alarm, calculate the maximum timestamp you want it to run, and save it as a local preference.
2) Then in the Alarm code itself, each time it is triggered you can make a first test to see if the current timestamp is before or after your limit preference saved at first time.
3) If reached, then cancel the Alarm as #karthik said. If not, keep your code going...

How to change repeating interval of AlarmManager at runtime in Android

I have written the following AlarmManager to start a Service which will download a file at specified interval:
Calendar updateTime = Calendar.getInstance();
updateTime.setTimeZone(TimeZone.getDefault());
updateTime.set(Calendar.HOUR_OF_DAY, 7);
Intent downloader = new Intent(mActivity, FileDownloadService.class);
downloader.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
PendingIntent pendingIntent = PendingIntent.getBroadcast(mActivity, 0, downloader, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, updateTime.getTimeInMillis(), AlarmManager.INTERVAL_DAY, pendingIntent);
From the other part of the application, I get the value for repeating interval to run the Service. The value for repeating interval change on daily basis.
How can we change the AlarmManager interval at runtime as the above code will be executed only once?
For example, on day 1 I want the repeating interval to be 15 minutes and on day 2 I want the interval to be 2 hours.
How can I change the repeating interval dynamically?

Store the value 15 minutes inside your pending intent as an extra. When your code gets triggered by the alarm manager, get the current value, increment it as per your needs and reset the extra in the intent which holds the value.
Edit : Use alarmManager.set(int type, long triggerAtMillis, PendingIntent operation); at every new invocation of your code.

Stop a service at specific time

I am starting my service using below code repeatedly. My service starts at 8am everyday. And AlarmManager repeates at every 1 min. I want to stop this sevice at 6pm. how can I do this ?
AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
PendingIntent loggerIntent = PendingIntent.getBroadcast(this, 0,new Intent(this,AlarmReceiver.class), 0);
Calendar timeOff9 = Calendar.getInstance();
timeOff9.set(Calendar.HOUR_OF_DAY, 08);
timeOff9.set(Calendar.MINUTE, 00);
timeOff9.set(Calendar.SECOND, 00);
//--------------------------------------------------------------------------------------------------------------------
long duration = userinterval * 60 * 1000;
manager.setRepeating(AlarmManager.RTC_WAKEUP,timeOff9.getTimeInMillis(), duration, loggerIntent);

In order to cancel at 6pm exactly, I would consider 2 options:
Each time the alarm triggers (i.e. every 1 minute), check the time, and cancel if time is after 6PM.
Set a once-off alarm in AlarmManager to go off at 6PM exactly. In that alarm, cancel.
I prefer option 2 for simplicity, and modularity of each code block. So for me, I would use (2) in my proof-of-concept code, while working on the solution.
But option 1 is better from a resources point of view, as the Android system only needs to remember a single alarm. I would use (1) in my final production code.
This way of working is just my personal preference, and most ppl probably will say to use (1) right away from the start.
The details about cancelling are below...
As for how to cancel an alarm, you don't often beat an answer by #commonsware....
Below answer copied from How to cancel this repeating alarm?
Call cancel() on AlarmManager with an equivalent PendingIntent to the one you used with setRepeating():
Intent intent = new Intent(this, AlarmReceive.class);
PendingIntent sender = PendingIntent.getBroadcast(this,
0, intent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.cancel(sender);

AlarmManager not setting, Alerting everytime activity is opened

I am trying to use this to set an alarm that goes off everyday.
String alarm = Context.ALARM_SERVICE;
Calendar calendar = Calendar.getInstance();
AlarmManager am = (AlarmManager)getActivity().getSystemService(alarm);
Intent intent = new Intent("NEW_ITEM");
PendingIntent sender = PendingIntent.getBroadcast(getActivity(), 0, intent, 0);
calendar.setTimeInMillis(System.currentTimeMillis());
am.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 1*AlarmManager.INTERVAL_DAY, sender);

Without running it, the code looks good to me... Obviously, if you set this alarm every time you start the activity, the alarm will go off immediately since: am.setRepeating(AlarmManager.RTC_WAKEUP, **calendar.getTimeInMillis()**, 1*AlarmManager.INTERVAL_DAY, sender); Tells the alarm manager to alert right now (2nd param) and to repeat in a day (3rd param, assuming your constant is correct).
If you want the alert to start only in 24 hours, simply change the line to:
am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + AlarmManager.INTERVAL_DAY, AlarmManager.INTERVAL_DAY, sender);

Code looks good, but you have to be aware of one thing. If the user decides to set the alarm again (for example, by hitting the 'set the alarm' button) the old one will be replaced. If you want to avoid this, check out this topic: Using Alarmmanager to start a service at specific time