Android Studio will not open new activity class after facebook login -


this facebookfragment.class code:

public class facebookfragment extends appcompatactivity {      textview study;     loginbutton loginbutton;     callbackmanager mcallbackmanager;        @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         facebooksdk.sdkinitialize(getapplicationcontext());         setcontentview (r.layout.activity_main);           study = (textview) findviewbyid(r.id.study);         loginbutton = (loginbutton) findviewbyid (r.id.facebookbutton);           mcallbackmanager = callbackmanager.factory.create();           loginmanager.getinstance().registercallback(mcallbackmanager, new facebookcallback<loginresult>() {              @override             public void onsuccess(loginresult loginresult) {                 study.settext("welcome" +                         loginresult.getaccesstoken().getuserid()+                         "\n"+ loginresult.getaccesstoken().gettoken());                 intent facebookact = new intent(facebookfragment.this, search_activities.class);                 startactivity(facebookact);              }              @override             public void oncancel() {                 study.settext("login cancelled");              }              @override             public void onerror(facebookexception error) {                 study.settext("error" + error.getmessage() );              }         });      }          @override     public void onactivityresult (int requestcode, int resultcode, intent data)     {         super.onactivityresult(requestcode, resultcode, data);         mcallbackmanager.onactivityresult(requestcode, resultcode, data);     }  }

i tried use facebook login open new activity search_activities. app not tell me whenever login success or not though did make onsuccess method.


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