Alarms
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The AlarmManager API allows applications to schedule code to run at some point in the future even if the application is not actively running. Alarms can be set to repeat at intervals like every 15 minutes or every hour. Alarms remain active even when the device is asleep and can optionally wake the device. The AlarmManager is accessed through the Context and allows setting one-shot or repeating alarms to launch activities, broadcasts, or services at the scheduled time.
Alarms
- 3. Alarms AlarmManager APIs Alarm Types Example Application
- 4. Mechanism for sending Intents at some point in the future Allows one application to make code execute, even when that application is no longer running
- 5. Once registered, Alarms remain active even if the device is asleep Can set configure Alarms to wake a sleeping device Alarms are canceled on device shutdown/restart
- 6. MMS - Retry Scheduler Settings - Bluetooth Discoverable timeout Phone - User Info Cache
- 7. Create & manage alarms indirectly, by interacting with the AlarmManager Get a reference to the AlarmManager by calling the Context class’ getSystemService(Context.ALARM_SERVICE)
- 8. // one-shot alarm void set(int type, long triggerAtTime, " PendingIntent operation)
- 9. // repeating alarm void setRepeating(int type, " long triggerAtTime, " long interval, " PendingIntent operation)
- 10. // repeating alarm with inexact trigger criteria void setInexactRepeating(int type, " long triggerAtTime, " long interval, " PendingIntent operation) Interval options INTERVAL_FIFTEEN_MINUTES INTERVAL_HALF_HOUR INTERVAL_HOUR INTERVAL_HALF_DAY INTERVAL_DAY
- 11. Two degrees of configurability How to interpret time What to do if the device is sleeping when the Alarm fires
- 12. Realtime - relative to system clock Elapsed - relative to time since last boot
- 13. Wake up device now & deliver Intent Wait to deliver Intent until device wakes up
- 15. PendingIntent getActivity(" Context context, " int requestCode, Intent intent, " int flags, Bundle options) PendingIntent getBroadcast(" Context context, " int requestCode, " Intent intent, int flags) PendingIntent getService(" Context context, " int requestCode, " Intent intent, int flags)
- 24. Networking