Right! That's why I believe that Google's claim that it was 'just the method signatures' doesn't really hold up since they took not just the statement of the interface, but what each part does and how they interact. The only part Google didn't take was the source describing how to do it.

> but what each part does and how they interact

That's not copyrightable, though. Maybe patentable, but that's a whole other can of worms.