study facebook newest sdk with android studio
Detail: get facebookid,user email,etc.
App Demo Download and test
https://github.com/facebook/facebook-android-sdk/tree/master/samples/Scrumptious
Detail: customize button by loginManager without facebook loginbutton to get basic profile
App Demo Download and test
Button style from rey5137/material
http://stackoverflow.com/questions/29446879/facebook-sdk-v4-loginbutton-ignores-xml-customizations
http://stackoverflow.com/questions/29634660/facebook-sdk-4-0-1-login-without-login-button
https://developers.facebook.com/docs/reference/android/current/class/LoginManager/