This sounds like you might not have the paths set correctly for the JDK or the Android SDK.
Different then the error you would get because of the steam client.
Did you go over this thread about it:
Unless of course it use to build for you and now suddenly it doesn't.
Is that the case?
I did, and It did, and yep it was lol,
I will indeed recheck the paths, and download- was fine before the steam update, had it all, but I guess in going through it all with a fine tooth comb I cleared away the unnecessary and went for a fresh install,download etc according to your very helpful guides , thanks for them by the way chaps, most helpful. probably simple as leaving out the neccessary api downloads perhaps, javac and tools.etc. whatever Ill get back to you in a tick to let you know how I get on, thanks.