android - Login using Facebook login button and start a new activity -

i want start new activity after facebook login. want application have facebook login button , after login enter in other activity, in tutorial after click on login button logout button appears , don't want logout button appear. code. using facebook-android-sdk 4.1.2 test new activity class.i want open after facebook login.

textview info; private loginbutton loginbutton; private callbackmanager callbackmanager; string name;  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     facebooksdk.sdkinitialize(getapplicationcontext());     callbackmanager = callbackmanager.factory.create();     setcontentview(r.layout.fb_button);     info = (textview)findviewbyid(r.id.info);     loginbutton = (loginbutton)findviewbyid(r.id.login_button);     loginbutton.setreadpermissions(arrays.aslist("public_profile, email, user_birthday, user_friends"));      loginbutton.registercallback(callbackmanager, new facebookcallback<loginresult>() {         @override         public void onsuccess(loginresult loginresult) {           graphrequest request = graphrequest.newmerequest(                     loginresult.getaccesstoken(),                     new graphrequest.graphjsonobjectcallback() {                         @override                         public void oncompleted(                                 jsonobject object,                                 graphresponse response) {                             // application code                              try {                            // url image_value = new url("http://graph.facebook.com/"+id+"/picture" );                                 name = object.getstring("email");                             } catch (jsonexception e) {                                 e.printstacktrace();                             }                             // getting email of use                            info.settext(name);                              log.v("loginactivity", response.tostring());                         }                     });             bundle parameters = new bundle();             parameters.putstring("fields", "id,name,email,gender, birthday");             request.setparameters(parameters);             request.executeasync();             intent intent = new intent(fbactivity.this, test.class);             fbactivity.this.startactivity(intent);          }          @override         public void oncancel() {              info.settext("login attempt canceled.");          }          @override         public void onerror(facebookexception e) {              info.settext("login attempt failed.");          }     });      // execute downloadjson asynctask  } @override protected void onactivityresult(int requestcode, int resultcode, intent data) {     callbackmanager.onactivityresult(requestcode, resultcode, data);    intent intent = new intent(fbactivity.this, test.class);             fbactivity.this.startactivity(intent); } 

you have add line code after login.

loginbutton.setvisibility(view.invisible); 

remember after logout show button with

loginbutton.setvisibility(view.visible);