State of telephone in Android

I'm looking for a sort of trigger in Android, that would let me perform a tas开发者_C百科k whenever a sound is played, so for incoming calls, SMS and e-mail notifications. I did find something like this, but it's only for when the phone is called:

http://developer.android.com/reference/android/telephony/TelephonyManager.html

What I want to achieve with this is sending a bluetooth signal to a bracelet, so it starts vibrating. This would be suited for the hearing impeared or people that work/live in a loud environment who don't carry their phone attached to their bodies.

Calls, SMSes and email are handled by different apps and they have different notifications. Besides calls, you can also get notifications for SMS but not for emails.

SMS broadcast is a private API, meaning that it is not officially supported and can change without notice: Android - SMS Broadcast receiver