I've posted some instructions and a sample application for building a Gear VR app with Unity: https://drive.google.com/a/tamu.edu/folderview?id=0B94R1-74uaJqNHhxRUZxd3JHeWc&usp=sharing

I'm not completely sure how much would be different for an Android app, but I'd assume many of the steps will be similar.