Additional headset/external buttons - accessible in android studio onkeypress

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Sep 6, 2016 3:06:01 AM via Website

Hi folks,

Forgive me if this thread is repeated, but I've been researching for a while for details how I can add more buttons other that Volume Up/Down on headset.
I have seen this very helpful link below, but it only discussed the impedances for Volume Up/Down.

"https: // com /devices/accessories/ headset/ specification. html"
please remove spaces for I was not able to post links

I was able to successfully add the 2 buttons, but are there any buttons (by impedances) that we can add?
Thanks a lot in advance for those who can help.