Create a single Animation for a Android mobile app

I'm writing a simple Android app for phone and watch. What it does is very simple - once opened, it shows a round button, in which an butt is drawn. When clicked, a fart sound is played, and an animation of that butt farting is shown. The watch app simple triggers a fart sound from the phone. The drawing I had in mind was something like from this site: [login to view URL] Since it needs to run on Android, I'll need the graphic and animation separated to a few PNG files (about 15). Thanks.