"Shaking Things Up" is not meshing well with previous code

So, having resolved some tech hurles recently, I'm back on track following along the first project videos, when we get to setting up the shake-to-activate section.

I downloaded the ShakeDetector.java element and set it beside my other source files. I even went on through another video (or two?), adding sensor hooks and deleting old button code, before I realized there's a problem.

It's a red "x" on the ShakeDetector.java icon in eclipse.

As I drill down, I realize it seems to be many items. The first was, it didn't like com.example.whatever in the code's declaration. OK, I admit I renamed mine, so I made the same change in that file.

Beyond that, there were multiple places where the fixit thingy is telling me to "Remove the @Override" from the code. But we just went through the significance of this, and certainly this code has been vetted and used many times already.

Then there's one that tells me that my android-17 doesn't have source with it or some such, and prompts me to point to the file; I can't find that one just now. (Oh yeah, my intellisense isn't working fully either).

Looking at the screen, my CrystalBall.java and MainActivity.java are still squeaky clean, so I'm really hoping this weird collection of errors really have some core configuration error in common that is triggering them.

Where should I start looking? (I can do screenshots if you need 'em!)

Thanks,