Develop Reference

not able to set alarm for more than 20 seconds

I had created alarm manager which invoke after 2 minutes which I want. But currently, i'm not able to set it more than 20 seconds. if I set for 20 seconds it returns output but if I set it for more than 20 I'm not able to set. I want to set it for 2 minutes. kindly help me.
I had added alarm fire code
AlarmManager manager = (AlarmManager) ContextGetter.getContext().getSystemService(Context.ALARM_SERVICE);
Intent intnt = new Intent(ContextGetter.getContext(), AlarmBroadcastReceiver.class);
intnt.setAction("com.demo.alarmEvent");
PendingIntent pending = PendingIntent.getBroadcast(ContextGetter.getContext(), 0, intnt, 0);
manager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+ 30*1000, pending);
kindly help me
i want it set it only once.
I also tried with this one.
AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent intnt = new Intent(EnterSysNumber.getInstance(), AlarmReceiver.class);
intnt.setAction("com.demo.Enter_number");
PendingIntent pending = PendingIntent.getBroadcast(getApplicationContext(), 0, intnt, 0);
manager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 120000, pending);

In Android N you'll run into Doze mode. Doze is a deep sleep mode to save battery power. It will prevent your service to preserve battery power.
AlarmManager and using setExactAndAllowWhileIdle when in low-power idle modes this duration may be significantly longer, such as 15 minutes.. But this is NOT suggested for any Play Store app, you will kill your user's battery.

Android - on sansung j5 Pending intent call does not work properly

I wrote a service to call pending intent after 1 minute
code:
AlarmManager alarms = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
alarms.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(),
60 * 1000, pendingIntent);
this code works properly on all devices except samsung j5.Where it calls service after 5 minutes.
Please let me know what could be the possible reason for this issue.

Android Alarm Manager repeating in not accurate time interval

I need my alarm to fire every 30 seconds - exactly as possible (+/-3 seconds). So I read this (official Android guide) and implemented this:
AlarmManager alarm = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, MyService.class);
PendingIntent pendingIntent = PendingIntent.getService(context, 0, intent, 0);
alarm.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 30000, pendingIntent);
Result: The Alarm fires +/- every 50 seconds, which is not so much accurate if I gave interval of 30 seconds.
Where is the problem and what's going on here? In the documentation they say things about be careful with exact timers since cpu & battery consuming etc. but nevertheless still there is an option for exact if I want, and this is what I thought I implemented.

try this:
alarm.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + (2 * 1000), (30 * 1000), pendingIntent);
change delay 2 or up seconds for start alarm on firt time.

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.

Android: After a long sleep, AlarmManager stops updating

I'm using the following code to schedule a service once a minute:
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC, calendar.getTimeInMillis(), 60 * 1000, createFrequentUpdateIntent(context));
Everything works OK for some time, but after a few hours I stop receiving the update intent. I wake the phone up, wait a few minutes and nothing happens.
How can I solve this?