showbox waiting for downloading
So apparently when I downloaded the Android SDK showbox waiting for downloading Mac a few months ago, it only downloaded the latest API available at the time. Which seems reasonable, except that it was just when Android 4.4W came out -- the API for *wearable* devices like wrist watches.
Discovered this when I tried to add an EditText field to a layout. Since wearables don't have on-screen keyboards, there is no EditText for Android 4.4W. But instead of helpfully telling you this, is just throws a random error and tells you to look for a non-existent menu item for more information.
At least Google was helpful... now to wait to download an API for an actual phone...