When I generate javadoc for my Android project in Eclipse, there are lots of warnings like
cannot find symbol
symbol : class TextView
and
If you have problems with the path to the SDK you can manually create a package-list file (or copy the one under $ANDROID_HOME/docs/reference/package-list) to your project.
To use a relative path you shouldn't use the file:/ prefix. If you put the file in sub-directory/package-list the argument would be -linkoffline http://d.android.com/reference sub-directory