Interval-based Task on Foreground Service

• Using count-down timer on Foreground Service.
• Mainly useful for small interval-based work where interval is less than 15 minutes and app needs to stay in Foreground
• Otherwise it's better to use WorkManager with Foreground Service.

Improvements

• As Count-down Timer uses it's own handler, maybe it's better to make a custom Count-down Timer with a reference to handler, so that more functionality can be added
• There may be other improvements, let me know here

References:

• https://developer.android.com/guide/components/services
• https://developer.android.com/guide/components/foreground-services
• https://stackoverflow.com/questions/10032003/how-to-make-a-countdown-timer-in-android