I was able to detect the KEYCODE_HEADSETHOOK (button on a headset) to activate speech synthesis. I got this to work but it mutes the tablets speaker. It seems as if there may be ways to get around this but it may only work for audio streams and not the speech synthsis.

Concern from potential collaborators prompted me to reach out to #WeAreNotWaiting to see if they had and stories or advice to share.

http://www.nightscout.info