Difference between AlarmManager and ScheduledExecutorService

by

ScheduledExecutorService runs in your application process. If application process dies, none of the scheduled tasks will run. Hence the need for Service (so your process lives beyond Activities active part of lifecycle).

While AlarmManager is critical system service that runs all the time. And if your application scheduled something and was killed, then AlarmManager may start application again (via PendingIntent).

And the last major difference that no one mentioned here is that AlarmManager knows about WakeLocks and power management. This means that AlarmManager may wake up Android device at specified time to run scheduled task. While ScheduledExecutorService knows nothing about power management and will only start task when device is not in deep sleep (i.e. it can simply miss the time).

More Related Contents:

  1. How to check if AlarmManager already has an alarm set?
  2. android prevent immediate trigger of alarm service if alarm time has passed for the day
  3. Android: keeping a background service alive (preventing process death)
  4. AlarmManager fires alarms at wrong time
  5. Calling startActivity() from outside of an Activity?
  6. does Alarm Manager persist even after reboot?
  7. How to set multiple alarms using alarm manager in android
  8. How to read “adb shell dumpsys alarm” output
  9. Android: Get all PendingIntents set with AlarmManager
  10. Android cannot pass intent extras though AlarmManager
  11. android: running a background task using AlarmManager
  12. How can I correctly pass unique extras to a pending intent?
  13. AlarmManager Android Every Day
  14. java.lang.SecurityException: !@Too many alarms (500) registered from pid 10790 uid 10206
  15. How to show daily offline notifications in Android 10?
  16. Is it possible to create multiple PendingIntents with the same requestCode and different extras?
  17. How to set Alarm in Android programmatically?
  18. setExactAndAllowWhileIdle – is not exact as of developer reference
  19. i want show notification at 8:00 am everyday
  20. Android AlarmManager setExact() is not exact
  21. Android alarm is cancelled after closing the application
  22. How does android compare pending intents
  23. How to save scheduled alarm after app was killed by Android or task killer?
  24. Android exact Alarm is always 3 minutes off
  25. Android Oreo killing background services and clears pending alarms, scheduled jobs after entering doze mode
  26. SharedPreferences in BroadcastReceiver seems to not update?
  27. AlarmManager setExact with WakefulBroadcastReceiver sometimes not exact
  28. Android AlarmManager problem with setting & resetting an alarm
  29. What’s “requestCode” used for on PendingIntent?
  30. Need code example on how to run an Android service forever in the background even when device sleeping, like Whatsapp?

Leave a Comment