A Choreographer test for Android's Project Butter. A runnable sample code for demonstrating how to use Choreographer to detect frame dropping. Also, it uses the info from Choreographer to estimate frame per second (FPS) every time a VSync signal is received.
You can find the introduction of Project Butter in the following link:
http://www.slideshare.net/yoshijava1/short-intro-to-project-butter
