With Spine 4.2 done and released, I dorked off yesterday and built a Spine runtime for Android. It's a plain old Android View, using the Canvas API for rendering.
I'm lazy, so I went straight with the spine-libgdx runtime as the base. That's written in Java. All of it. And yet, this little thing screams (especially compared to the competition in the mobile app animations space, which is written in C++)
The renderer is 200 LOC, batches and doesn't generate any garbage that'd trigger stuttering.
