How to integrate Gmail login in Android application?

Which is the right way to implement Gmail login in my Android application?

https://developers.google.com/gmail/api/quickstart/quickstart-java
or
http://www.javacodegeeks.com/2013/10/google-account-integration-in-android-login-with-gmail.html

I want to provide Gmail login for getting user credentials.Somebody please help me.

Solution

Official guide: Google Login

Also look at this very good tutorial with demo. Follow the steps to enable google login from developer console and download the code. AndroidHive Google+ login

Hope this helped!

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