Can I write and test a Hello World program for Google Glass without actually having it? Is there an emulator I can use to test the app?
I have seen a video showing that we can run it on Nexus Tablet. Check out the link http://liliputing.com/2013/05/run-google-glass-apps-on-a-nexus-7-tablet.html
No... there's not official Google Glass Emulator.
Yes... you can preview your cards in playground. This shows you how content is displayed on Google Glass.
And yes... you can test Google Glass apps on Android Device (Nexus 7, Nexus 5, ...) with this. If you don't know how to do that, look at this. But don't expect, that it'll work without bugs.
来源：https://stackoverflow.com/questions/20465622/can-i-test-a-program-for-google-glass-without-google-glass