It seems like every tutorial that I can find has a different, usually old, way of doing it. For example, even Google's LiveCard page has an example where they tell you to implement LiveCardCallback , however the link they give is dead, and that class doesn't exist in the GDK.
I also found a gdk apidemo on github, but most of those examples seem to be outdated?
Any good resource for an Android developer just starting out on Glass?
LiveCardCallback was renamed to DirectRenderingCallback in XE12. Thanks for catching one that we missed!
Third-party examples that you find online may have not yet updated to XE12, but the Compass, Stopwatch, and Timer on our GitHub page (and also found in the add-on's samples folder) are all updated and good examples of using live cards with high-frequency direct rendering.