Most of my iOS developer friends have no desire to learn Android. That is what makes Android development hot - as you have very little overlap of iOS and Android. Believe me, I've paid for attempting to switch back between iOS and Android with splitting headaches (if not done on separate days). I don't believe people who specialize in both.
You left something off your list, the sheer insanity of async loading images into a ListView. iOS developers have EGOImageView, we have a few competing implementations, including writing your own.
> I am of the opinion that in order to build a stable, robust app, Content Providers, at the very least, are required (for many reasons,
One way to see if someone knows what they are talking about is to ask them about multi-table content providers.
Also, what phone does the candidate have in his or her possession...