When I generate javadoc for my Android project in Eclipse, there are lots of warnings like
cannot find symbol
symbol : class TextView
and
After a bit of trial and error (And plenty of suggestions gleaned from multiple web searches), I was able to get this working with a specific ANT script, which can be run in Eclipse by "Run As -> Ant Build".
I saved this file, "javadoc.xml", in the directory of my project, in parallel with the AndroidManifest.xml file.
Here is the content of the file: