how to handle lock screen button input for android activity?

Suppose I have something like an alarm activity which launches the alarm through the lock screen, accomplished via

getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);

Now, from here I could press the back button to kill the activity, but I also want a press of the lock button to silence the alarm. How would I go about creating a handler for presses of the开发者_运维知识库 lock screen button?

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Listen to this broadcast intent

ACTION_SCREEN_OFF

You can switch off your alarm when you get this intent