title: Get user email from Facebook SDK android
body: <p>I am just starting out with the Facebook SDK, I currently have an app that has its own login system, the user enters their email and password and then the app checks a mysql database to find the user. 
  If the user is their it returns the user info and logs them into the app.</p>
  
  <p>What I am trying to do is allow the user to just press a Facebook button and have the Facebook SDK return the users email linked to their Facebook account. 
  Then I can search my database for that email and log the user in or create an account for them if their is no account with that email.</p>
  
  <p>I have everything set up apart from having the Facebook SDK actually return the email for the user. I am not sure where to start with this and could really use some help!</p>