My website uses Mongo as its database. I was wondering if the Java driver from the Mongo website applies to Android as well because I read that it wasn't supported.
Simpy put it's not a good Idea for your Android app to connect to MongoDB directly in the first place.
You should be thinking as if it was just another web client and implement a RESTful interface for all the data you want to exchange or update. Look at these links as a possibility or otherwise roll your own interface.
MongoDB should be supported on Android since 2.9.0 Based on this : https://jira.mongodb.org/secure/ReleaseNote.jspa?projectId=10006&version=11124
This may be helpful : http://www.mkyong.com/tutorials/java-mongodb-tutorials/