"Debug As..." in Eclipse for Android

Question

I'm an Android noob teaching myself debugging in the Eclipse (Galileo 3.52) environment.

I have a little "hello world" app that runs fine in the emulator. So now I want to practice debugging by setting breakpoints, looking at variablaes, etc.

But Run > Debug As... has nothing but a grayed-out "(nothing applicable)" entry. What does that mean and how do I configure it to say "Android application"?

I'm guessing it has something to do with the Run > Debug Configurations dialog, but it's not obvious to me.

Thanks in advance.