Retrieved from public sources as described in script below.

++++

#! bin/sh

git clone git://git.source.android.com/platform/frameworks/base android-api
cd android-api/
git checkout gingerbread-release

zipfile=./android-java-src.zip

rm -f $zipfile

jar cvf $zipfile -C core/java .

for i in `find . -maxdepth 2 -name java` ; do
    if [ "$i" != "core/java" ] ; then
        jar uvf $zipfile -C $i .
    fi
done