https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/android-notifier/android-notifier-desktop-0.5.1-1.i386.rpm

would be

pkg:generic/code.google.com/android-notifier?download_url=https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/android-notifier/android-notifier-desktop-0.5.1-1.i386.rpm

where the type is generic, namespace is code.google.com, name is the project name, and the download url is set as a qualifier.

We do not use code.google.com as a type because code.google.com repos has been shut down.