I want to use AlarmService to trigger a notification at a certain time. Think of it as something similar as a calendar app that is showing a reminder as notification for an upcoming event.
The code to schedule the intent (via alarm service) looks like this:
fun scheduleNotification(event : CalendarEvent)
val startTime : Instant = event.startTime
val intent = buildPendingIntent(event)
val notificationTime = startTime.minusMillis(TimeUnit.MINUTES.toMillis(10)) // 10 Minutes earlier
if (Build.VERSION.SDK_INT < 23) {
alarmService().setExact(AlarmManager.RTC_WAKEUP,
notificationTime.toEpochMilli(), intent)
} else {
alarmService().setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,
notificationTime.toEpochMilli(), intent)
}
}
fun buildPendingIntent(event : CalendarEvent){
val intent = Intent(context, NotificationReceiver::class.java)
intent.putExtra(EVENT_ID, event.id)
return PendingIntent.getBroadcast(context, 0, realIntent, 0)
}
class NotificationReceiver : WakefulBroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
// build and display the notification
}
}
So 1 of 10 times the notification is tirggered and shown (by NotificationReceiver) correctly, also at the desired time. So I think the scheduling part is working properly.
Which leads me to another question: Whenever the user creates a new CalendarEvent the method scheduleNotification(newEvent) is called. It seems to me that AlarmService is internally updating the PendingIntents of existing and that this is the reason why 1 of 10 (usually the first scheduled PendingIntent) is triggered, but the others are not.
How many alarms can I schedule for an Android App? Do you spot any other issue with my code?
