For short delays, it's easier and more efficient to use the postAtTime() and postDelayed() methods of a Handler.
Your app does not use resources (such as timers or background services), since the OS manages the scheduling.Īlarms are not the best solution if you need a simple delay while your application is running, for example, a short delay for a UI event.
Can be used to trigger periodic tasks (such as an hourly news update), even if your application is not running.
Maintained by the OS, not your application, so alarms are triggered even if your application is not running, or the device is asleep.
Schedule alarms for a set time or interval.
This means, you need to re-schedule them explicitly when device boot completes. Once an alarm is scheduled, it will invoke even when your application is not running or in sleep mode.Īn scheduled alarm will execute unless it is stopped explicitly by calling cancel() method, or until device reboots. When an alarm goes off, the Intent that had been registered for it is broadcast by the system, automatically starting the target application if it is not already running.ĪlarmManager runs outside the lifetime of your application. This allow you to schedule your application to be run at some point in the future. AlarmManager class provides access to the system alarm service. Scheduling and repeating alarms are generally used as a local reminder to notify user about some event.Īndroid provides AlarmManager to create and schedule alarms. Scheduling operations via AlarmManager in Android Android
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