This project is to understand how to login to Flickr and pull images from there. This project uses the Flickr Authentication API, not OAuth.
Where to get the API key: http://www.flickr.com/services/api/misc.api_keys.html
API Documentation: https://www.flickr.com/services/api/
OAuth with Flickr: http://www.flickr.com/services/api/auth.oauth.html
Book: Pro Android Media: Developing Graphics, Music, Video, and Rich Media Apps for Smartphones and Tablets - Shawn Van Every