Switch to another activity after successful Facebook login in Android App -

i new adroid app development , started learning week. since 3 days struggling switching activity after successful facebook login.

my questions :

1) need redirect activity once user logged in. 2) need have profile details profile picture, email , name etc on next activity frame (which come after login).

current state : after login, fragment stays , logout button displayed.

my code fragment here :

public class loginfragment extends fragment {  private callbackmanager mcallbackmanager; public accesstokentracker maccesstokentracker; public profiletracker mprofiletracker;  private facebookcallback<loginresult> mcallback = new facebookcallback<loginresult>() {     @override     public void onsuccess(loginresult loginresult) {         accesstoken accesstoken = loginresult.getaccesstoken();         profile profile = profile.getcurrentprofile();         log.d("get me profile", "name");         //log.d("welcome :", profile.getname());       }      @override     public void oncancel() {      }      @override     public void onerror(facebookexception e) {      } };  public loginfragment(){  }  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     facebooksdk.sdkinitialize(getactivity().getapplicationcontext());      mcallbackmanager = callbackmanager.factory.create();      accesstokentracker maccesstokentracker = new accesstokentracker() {         @override         protected void oncurrentaccesstokenchanged(accesstoken oldtracker, accesstoken newtracker) {          }     };      maccesstokentracker.starttracking();      profiletracker mprofiletracker = new profiletracker() {         @override         protected void oncurrentprofilechanged(profile oldprofile, profile newprofile) {             //log.d("new name", "data");         }     };      mprofiletracker.starttracking(); }  @nullable @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {     return inflater.inflate(r.layout.login_main, container, false); }  @override public void onviewcreated(view view, bundle savedinstancestate) {     super.onviewcreated(view, savedinstancestate);     loginbutton loginbutton = (loginbutton) view.findviewbyid(r.id.login_button);     loginbutton.setreadpermissions("public_profile");     loginbutton.setfragment(this);     loginbutton.registercallback(mcallbackmanager, mcallback);  }  @override public void onresume() {     super.onresume();     profile profile = profile.getcurrentprofile(); }  @override public void ondestroy() {     super.ondestroy();     maccesstokentracker.stoptracking();     mprofiletracker.stoptracking(); }  @override public void onactivityresult(int requestcode, int resultcode, intent data) {     super.onactivityresult(requestcode, resultcode, data);     mcallbackmanager.onactivityresult(requestcode, resultcode, data); } 

}

request kind words guys make work.

for answering first question 1) in facebookcallback:onsuccess method can method opens next activity needed, , in oncreate of fragment, check if accesstoken null, if null nothing wait user press login, if not null, call same method open activity needed user logged in

2) have check documents , permissions profile picture , name current logged user, , if have questions, please write code use first user data