You forgot to mention the SDK changing so much with each new API that the published training manual suggests using deprecated or no longer existing classes and

You forgot to mention the SDK changing so much with each new API that the published training manual suggests using deprecated or no longer existing classes and methods. I recently updated some of my old Android code which had been geared toward the early Blackberry-like arrow button navigated Android, not the post-iPhone touchscreen navigated modern Android. That was before even the diverged 2.x phone, 3.x tablet split which was not merged until 4.0. Yes it can be annoying. I appreciate the improvements they have been making each version though, and kind of expect it to be like this prior to maturity.