Not necessarily, because interoperability would come under fair use. Interesting in this case is that Google deliberately designed Android not to be compatible …
My only argument is that it’s a somewhat arbitrary line deciding that code can be copyright but API’s can’t, as if they exist in some vacuum from each other.
Incidentally it seems at some point Google tried to argue that code shouldn’t be copyrightable either, only patentable. Oh joy! See, neither side is right in this argument but both sides may (inadvertently) f**k things up even more than they are already. 
I’m on neither side - I’m sitting on the fence munching popcorn.