Or you can try this app, which Google appears to have removed today (cache: http://webcache.googleusercontent.com/search?q=cache:https%3...) -- installed it, but haven't tried it yet... here's a backup of the .apk from my phone: http://dl.dropbox.com/u/32510284/N64%20Player%28Free%20N64%2...

It's also hosted on Github: https://github.com/emudeveloper/N64-Player--Mupen64plus-