I would like to know if there is a way (probably a system broadcast) to know that the alarm clock default application is now start ringing.
if not - I\'ll be satisfied a
You can't query AlarmManager for a list of commands which is what you would need to do to achieve this.
AlarmManager
The closest you can get to finding a list of alarms would be to use dumpsys adb shell dumpsys alarm, but obviously you can't do that in code.
adb shell dumpsys alarm