Android API for Google Drive?
edit: with the deprecation of the docs list API, this is no longer the best solution
You can use the existing Documents List API to access Drive resources, they share the same endpoints.
Unfortunately the Documents List API is mainly documented in .NET (just the oauth is in java). For the life of me I am struggling putting together the end points in the gdata jar to upload a simple file. Tried to use the .net example as a guide put couldnt find the comparable classes in java.