java - Android - Can't access onSuccess of callback after login with Facebook in fragment -

i have successfully logged in facebook. but, can't access token or user profile onsuccess method of callback. have added callbackmanager.onactivityresult in onactivityresult. can login, can't access token id , user profile

main.java

public class main extends appcompatactivity {      private callbackmanager callbackmanager;      @override     protected void oncreate(bundle savedinstancestate) {         facebooksdk.sdkinitialize(getapplicationcontext());         callbackmanager = callbackmanager.factory.create();     }      @override     protected void onactivityresult(int requestcode, int resultcode, intent data) {         super.onactivityresult(requestcode, resultcode, data);         callbackmanager.onactivityresult(requestcode, resultcode, data);     } } 

accountview.java (fragment , error location)

 public class accountview extends fragment {      private callbackmanager callbackmanager;     private facebookcallback<loginresult> callback;      @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {         view view = inflater.inflate(r.layout.account, container, false);         setupview(view);         return view;     }      public void setupview(view view) {         callbackmanager = callbackmanager.factory.create();         loginbutton facebookloginbutton = (loginbutton) view.findviewbyid(r.id.widget_facebook_button);         callback = new facebookcallback<loginresult>() {             //error             @override             public void onsuccess(loginresult loginresult) {                 accesstoken accesstoken = loginresult.getaccesstoken();                 profile profile = profile.getcurrentprofile();                 //error - can't access token , user name                 log.d("facebook id", accesstoken.getapplicationid());                 log.d("profile name", profile.getfirstname());             }              @override             public void oncancel() {          }              @override             public void onerror(facebookexception e) {              }         };         facebookloginbutton.setreadpermissions("user_friends");         facebookloginbutton.registercallback(callbackmanager, callback);     } } 

in fragment override onactivityresult() did same in activity. :

@override public void onactivityresult(int requestcode, int resultcode, intent data) {     super.onactivityresult(requestcode, resultcode, data);     callbackmanager.onactivityresult(requestcode, resultcode, data); }