There was a third-party app to snap pictures with winks: winky on github. This app gets the eye gesture detection service using reflection and uses it to take pictures. But the service is unavailable since XE11.
Is there a way to detect winks in a Google Glass running on XE12? Glasses now support taking pictures with winks (which can be configured from settings), but is there any service available in GDK to detect winks? Or is there any event listener that fires when a wink is detected?