I have call LoginButton set permissions.
  mBtnLoginFacebook.setFragment(this);
        mBtnLoginFacebook.registerCallback(mCallbackManager,
                                           mFacebookCallback);
        mBtnLoginFacebook.setReadPermissions(Arrays.asList("public_profile",
                                                           "email",
                                                           "user_birthday"));
but in logcat :
06-19 16:31:12.427    1592-1592/com.createtrips.app E/>>>>>﹕ accrsss{AccessToken token:ACCESS_TOKEN_REMOVED permissions:[email, public_profile]}
06-19 16:31:12.647    1592-1592/com.createtrips.app W/System.err﹕ org.json.JSONException: No value for birthday
//______________// Birthday no call.
                        
If your app requests
user_birthdaypermission Facebook will have to review how your app uses it.According to the new Facebook Terms And Conditions.