This guide is at least three major versions out of date. I cannot vouch for its correctness, but it shall remain here in case it is of use to somebody.
I wrote this guide in 2011 during my internship with Orange Labs UK. It is a step-by-step guide to get started with debugging the NDK, including setting up Eclipse etc. It was written for a Windows environment, but at the time I know people successfully used it to perform the debugging on OS X. You will have to change some paths, ignore references to Cygwin, etc. - this is not covered in the guide.