What happens should I add an alarm but set the starting date to a past date?
Does is get executed immediately or is it put in the queue and never executed?
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, startDate, repeatingValue, alarmIntent);
From documentation, if the startDate time is in the past, the alarm will be triggered immediately.
If the date is in past then alarm will trigger immediately. However you may try to use setInexactRepeating instead of setRepeating:
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, startDate, setInexactRepeating , alarmIntent);
From the setInexactRepeating() docs:
Schedule a repeating alarm that has inexact trigger time requirements;
for example, an alarm that repeats every hour, but not necessarily at
the top of every hour.
Actually AlarmManager works with the current time.
So when you will set past date alarm then AlarmManager will execute
public void onReceive(Context context, Intent intent)
{
}
method.
I think the alarm is set only for hours(at least through the Android user interface), not for a particular day, this way it will start on the exact hour:minute you set.
As i can conclude from my previous experience with AlarmManager. Date that is in the past will trigger alarm immediately.
As far as I can tell, AlarmManager.set will execute now when the time is set to a past time, the documentation says as much. This sentence is missing for AlarmManager.setInexactRepeating , this alarm will not trigger when it's set for a past time, it will trigger at the next interval, starting from the given time.
AlarmManager.set and AlarmManager.setInexactRepeating are both calling setImpl, with the triggertime they got passed as parameter (checked in Android 7.1.2 sources).
--> there's no difference in both methods, if the triggertime is in the past.
Related
I'm building an Android organizer app.
I have an Event class that has a start time and I want to trigger some action when this time comes. So, how can I constantly compare this start time with current time, to know when it comes?
Thanks!
Instead of constantly checking for current time against scheduleStartTime, you can schedule task to trigger at scheduledStartTime.
You can use either JobScheduler or AlarmManager
https://developer.android.com/reference/android/app/job/JobInfo.Builder.html
https://code.tutsplus.com/tutorials/using-the-jobscheduler-api-on-android-lollipop--cms-23562
You can set when to trigger task by specifying time difference between start time and current time in millisecond.
builder.setPeriodic(5000);
Or you can also use Alarm manager
https://developer.android.com/training/scheduling/alarms.html
alarmMgr.setInexactRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, alarmIntent);
Hope this help
You could use one of the following solutions :
Have a time and on Timer tick, you could compare your start time against the current time and trigger you action if needed.
Or, you could use a ScheduledExecutorService to schedule the task you want to archive x seconds in the future base on the current time and the start time of your Event
As you are on Android, I would recommend to do this as part of a Service.
Hope this will help.
In my application I want to trigger a recurring alarm at about a specified time to check for some conditions and notify the user if necessary.
I'm using the following code to schedule the alarm:
Calendar cal = ...;
...
mAlarmMgr.setInexactRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), AlarmManager.INTERVAL_DAY, mAlarmIntent);
I now noticed (because I accidentially had the wrong day in cal) that the alarm would be triggered right away if cal was some date/time in the past.
So let's say it is 2016-09-20 18:00:00 and I schedule the alarm for 2016-09-20 17:00:00. I'd get a notification right away (or a couple of seconds after scheduling the alarm). This does not happen if I schedule the alarm for a future time like 2016-09-20 18:15:00.
So my questions are:
Will Android always catch up on the missed alarm?
The alarm is scheduled to repreat daily. Will it then repeat at 17:00:00 tomorrow or will it be at 18:00:00, because that was when the alarm was last triggered?
Will Android always catch up on the missed alarm?
if the set time is in past then android trigger alarm as soon as possible. check the docs
The alarm is scheduled to repreat daily. Will it then repeat at
17:00:00 tomorrow or will it be at 18:00:00, because that was when the
alarm was last triggered?
Next time it will be triggered on time
Additional Info : if the use clear app data or forced close your app from application manager then alarm won't trigger until user open your app again plus reboot can also cause this.
I'm developing an app that has to run certain tasks when the user schedules them to be executed. I'm not sure what the following means in the Android docs.
triggerAtMillis: time in milliseconds that the alarm should go off, using the appropriate clock (depending on the alarm type)
This a quote from the set method documentation.
If I want the task to run at, for example, 27.10.2013 18:05, should I use 1382810700000 which is the date in milliseconds, or the time as milliseconds between now and that time?
If u want to create alarm for say for example-27.10.2013 18:05 you can use try something like this :
Calendar cal = Calendar.getInstance();
cal.set(year, month, day, hourOfDay, minute, second);
Alarm Service:
AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC_WAKEUP, cal .getTimeInMillis(), pendingIntent);
"time in milliseconds that the alarm should go off, using the appropriate clock (depending on the alarm type)."
So that means the date(hours min etc) in miliseconds you want it to run.
This tutorial might help you.
eventPoller.schedule(new EventPoller(adapter),dateOfEvent , 100000);
I want to schedule remainder for particular date and time by using TimerTask. i am doing this without broadcast receiver as I just want to schedule it and show some notification as remainder to user.
so please suggest me, how can I pass the date and time both in this method so that Notification will come on that exact time and date.
is there any other way to remind events to user other than broadcast receiver?????
please suggest any solution asap.............
Use alarmManager.
Keep in mind that you need to set alarmManager every time user restarts phone. This means you need to implement BroadcastReciver and set it there.
If you need an example in can post it for you.
I have this code called in a Service:
timer.scheduleAtFixedRate(new TimerTask(){
public void run() {
showNotification();
}
}, firstNotify, 86400000L);
It is my understanding that this should cause showNotification() to be called once per day at the same time each day, at the time specified in firstNotify (86400000 being the milliseconds in a day).
However, the notifies were happening approximately every 3 hours on my phone, and a little over 4 hours on my friend's phone. Is there any reason why these would be occurring faster than the specified 1-day period for repeating?
I know its not a direct answer to your question, but you should use AlarmManager in such cases as yours. See setRepeating function.
If your Service is not setup correctly and it is being shut down at some point, the Timer would be recreated and called again after a firstNotify delay. Does this sound possible? You might be better off using AlarmManager to create the timed event.