I\'m running ADT (Android Development Tools) in Eclipse and verified that my debugger is working by putting a breakpoint in MainMenu.oncreate (class Activity).
MainMenu.oncreate (class Activity)
in addition to sargas's answer , because in Run mode you could get an error if you forget to comment that line, you could use the following:
if(android.os.Debug.isDebuggerConnected()) android.os.Debug.waitForDebugger();
so it takes care of itself.