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Alarm Update Flag is it really working in Android 12

I'm using a timer to check the time and set the alarm every 3 minutes so it contains the following line:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
contentIntent = PendingIntent.getBroadcast(getActivity().getApplicationContext(), 12,
my_intent,PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_MUTABLE);
}
Then I set the alarm using the following code:
alarmMgr.setAlarmClock(new AlarmManager.AlarmClockInfo(calendar.getTimeInMillis(), contentIntent), contentIntent);
The alarm receiver is not called as expected.But if I used that code and set the alarm only one time without a timer it works.So I think FLAG_UPDATE_CURRENT is not working because it works for versions before Android 12 perfectly .If you tested that code using a timer and it works please reply to me...

How do I create an alarm clock like Alertmanager?

The alarm clock must start by itself, even if the app has been closed and the smartphone restarts.
Is there a safe way to program such an alarm clock?
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Intent startServiceIntent = new Intent(context, MyService.class);
PendingIntent startServicePendingIntent =
PendingIntent.getService(context,0,startServiceIntent,0);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
if(alarmManager != null)
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,System.currentTimeMillis()
+ 1000 * 60,1000 * 30,startServicePendingIntent);

you can do it easily but you need add some Property to your app like :
1-set first method for set alarm
2-save and handle value for alarm (Room ، Sql or etc) // if you want make loop alarm
3-use broadcastreceiver for two reason(set notification or handle background and close app or restart or somethings like that)
4- some custom method for better handle data streaming in app
i hope this link will can help you
link refrences
have fun :)

Android alarm manager fire at the exact moment

I have an app which needs to do task at the exact time provided just like the stock android alarm clock I have used setExactAndAllowWhileIdle() / setExact(). But BroadcastReciever fires after some minutes and sometimes after opening the app, is there any workaround for it?
Alarm Setter code
// set Alarm
Intent intent = new Intent(this.context, AlarmReceiver.class);
intent.putExtra("alarmInfo", extraInfo);
intent.setAction(Long.toString(System.currentTimeMillis()));
PendingIntent pendingIntent = PendingIntent.getBroadcast(this.context, 123456, intent, 0);
AlarmManager alarmManager = (AlarmManager) this.context.getSystemService(Context.ALARM_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, finalTime - 400, pendingIntent);
} else {
alarmManager.setExact(AlarmManager.RTC_WAKEUP, finalTime - 400, pendingIntent);
}
BroadcastReciever
setNextAlarm();
Log.d("RESULT", "fired");
Intent alarmIntent = new Intent(context, AlarmSoundService.class);
// Log.d("extra", "alarmInfo: " + intent.getStringExtra("alarmInfo"));
alarmIntent.putExtra("alarmInfo", intent.getStringExtra("alarmInfo"));
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
context.startForegroundService(alarmIntent);
} else {
context.startService(alarmIntent);
}
setNextAlarm() is the previous code I provided which sets the alarm for the future task.
EDIT
Ok so I have solved my problem the first is getting my alarm to fire at the exact moment so setExactAndAllowWhileIdle() / setExact() are both kind of exact so if I need to show user something and have to be accurate
I used the setAlarmClock() as the android doc explains
The system may also do some prep-work when it sees that such an alarm
coming up, to reduce the amount of background work that could
happen if this causes the device to fully wake up
The second problem was that the alarm wasn't firing up unless I open the app this was due to the fact that two alarms were firing between the interval of 5 minutes and since I was using setExactAndAllowWhileIdle()
and the android doc explains
Under normal system operation, it will not dispatch these alarms more
than about every minute (at which point every such pending alarm is
dispatched); when in low-power idle modes this duration may be
significantly longer, such as 15 minutes.
And that was it.

AlarmManager Android SDK

I have a problem executing the following code:
Intent myIntent = new Intent(MedicineEntry.this, DisplaySchedule.class);
PendingIntent pendingIntent = PendingIntent.getActivity(MedicineEntry.this, 0, myIntent, PendingIntent.FLAG_CANCEL_CURRENT);
AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, 17);
calendar.set(Calendar.MINUTE, 25);
calendar.set(Calendar.SECOND, 0);
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, 1);
alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
Toast.makeText(MedicineEntry.this, "Alarm Will Start In A Second", Toast.LENGTH_LONG).show();
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_FIFTEEN_MINUTES, pendingIntent);
To elucidate my problem, the app should fire up according to the values set for HOUR_OF_DAY, MINUTE and SECOND - even if the device is in sleep mode. I've tried testing the code, but the app does not seem to work. I've tried replacing AlarmManager.INTERVAL_FIFTEEN_MINUTES with 5*1000 which worked fine. Please go easy with the terminologies. I've just started to program with Android this semester at college.
EDIT: This app I am creating is a 'reminder' app. The user is expected to enter the time which the app should execute.

There are basically two ways of interacting with the AlarmManager. Your post is somewhat vague about which will suit your needs.
Anyway, if you want an "Do every 15 minutes" type of alarm, use the ELAPSED mode:
long firstActivation = SystemClock.elapsedRealtime(); // and not System.currentTimeMillis()
mgr.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, firstActivation, INTERVAL_MILLISECS, intent);
But, if you're looking for an "Do every day at 15:30" semantics, use RTC mode, like this:
long activationTime = calendar.getTimeInMillis();
long TWENTY_FOUR_HRS = 24 * 60 * 60* 1000;
mgr.setInexactRepeating(AlarmManager.RTC_WAKEUP, activationTime, TWENTY_FOUR_HRS, intent);
Two things to note at the above code:
A. I am using a waking up type of alarms. These are potentially expensive as they would wake up a sleeping device. Are you sure this is what you need (hint: most apps do not)?
B. I am using setInexactRepeating() instead of setRepeating() so to allow the alarm manager to batch together several alarms thus saving resources. If you do not have a good reason not to do so, stick to using setInexactRepeating()

How to retrieve items from server after fixed time period?

I am returning 7 URL's that I retrieve from a Text document on a remote server.
The URL's are links to images that I want to then download and put into a cache. These URL's will change every week.
I want to retrieve these URL's from the text document only once on a fixed day of week (e.g. Monday only).
How I can do that?

1: Make a service that connect server and get URL's then write URL to a file for use in you application.
2: Then Use alarm manger to create a alarm for a specif day. You can find details here.
how do I set an alarm manager to fire after specific days of week
While creating alarm you have to add your service with your alarm object so that when alarm time come. Then it run the service.(But be careful In that time there may be no internet.)
you can add your service to alarm object e.g
/* Scheduling Alarm for URL's update service to run at One */
Log.i(TAG, "Alarm started");
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, 10);
Intent versionUpdateService = new Intent(getApplicationContext(), MyURLUpdaterService.class);
PendingIntent recurringUpdate = PendingIntent.getService(getApplicationContext(), 0, versionUpdateService,
PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarms = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
alarms.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, recurringUpdate);
Log.i(TAG, "Alarm ended");