The remarkable thing about Processing on Android is that you can use your (desktop) sketchbook development environment as always, then run on the Google emulator or your device.
Google’s open-source Android mobile platform runs on Java. Processing, the elegant coding language for visualization, art, and media, is built in Java. The marriage of the two, therefore, is one we’ve long been anticipating. Processing’s ability to focus on lightweight, portable implementation is a perfect match for the demands of mobile development. For artists and visualists wanting to make handheld devices and tablets more expressive, I have good news: it’s coming. While not fully implemented or ready for widespread testing yet, Processing is in active development on the platform.