Help Login with facebook integration

[Android Question]

Hi everyone i am new in android i already developed 3 apps now i am developing an app which requires login with facebook i downloaded facebook sdk from developer.facebook site and import in android studio after checking many posts still am unable to perform facebook integration ,the error is in xml file that com.facebook.widget.loginbutton it says it cannot resolve to type please give me step by step tutorial i have to perform this on urgent basis so please help me out any suggestion will be appriciated

 

[Hadron]

The sticky post on this forum tells you how to get the best answer to this type of question: http://androidforums.com/threads/developers-please-read-this-before-posting-in-here.904569/