How to authenticate with Google Accoutnt ?

 

How can we create user authentication with goolge accout with mgwt or gwt-phonegap ? I would like to use purge java api not phonegap javascript api.
I would like to create activity with username and password to login user with google accout

that user already has.

I woruld also get user info email phone number ... from user google account.

Which api librarys should I use? Do anybody have any tutorial link for this?

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