Android AUthentication with Facebook, Twitter and Linked In

I require three android activities to be written, when invoked they would initiate authentication with facebook / twitter / linkedIn and upon successful authentication they will pass back the username to the previous activity via new Intent. Here are some reference material that developer can look into Procedure to integrate with Facebook Authenticaion [[login to view URL]][1] [][1] Twitter API that may be used for sign on with Twitter <[login to view URL]> OAuth java resources <[login to view URL]>