For example:
I'm in an Activity, then, when I say "Ok glass" (or other words if it is possible), I want to go to other Activity.
The voice command, here, is like an action to pass to other Activity.
¿Is it possible on Glass?
If you want to use voice commands on google glass you must follow this steps
Also dont forget to add development permission:
<usespermissionandroid:name="com.google.android.glass.permission.DEVELOPMENT"/>