I made this project to test using Spine in Scene2D.UI from LibGDX. The recommendations I've seen suggest designing the UI in Spine with place holders and just use the bone data in the game. Spine would not do any rendering. I didn't like this approach because I wanted more complex animations but with the control, placement, and resizing of Table layout.
I was able to achieve this with SpineDrawable. Menumation UI's code is probably too verbose for most people, so I guess SpineDrawable is the most useful contribution I made in this endeavor. You can use that to plug in your animated character into your menu seamlessly, for example. Let me know if you have a use for it and need help. Thanks.
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Runnable Example (Java)
