To my knowledge there isn't one. I talked to a friend of mine that works on the Android core, and he said it'd be a challenge to do without continuously pollin

To my knowledge there isn't one. I talked to a friend of mine that works on the Android core, and he said it'd be a challenge to do without continuously polling the entire view stack for changes. Objective-C's runtime makes it easy to hook into methods and watch for changes, but Java isn't so flexible. He said it'd probably require a custom build of the Android OS to do well. But I'd love for both of us to be proven wrong!