java - Facebook 4.x Login SDK Not Completing Login Process -

i following tutorial , working, when click on login button, progress spinner appears brief moment, disappears. have tried debug, , i'm not hitting callback:

 private facebookcallback<loginresult> callback = new facebookcallback<loginresult>() {         @override         public void onsuccess(loginresult loginresult) {             accesstoken accesstoken = loginresult.getaccesstoken();             profile profile = profile.getcurrentprofile();             displaymessage(profile);         }          @override         public void oncancel() {          }          @override         public void onerror(facebookexception e) {          }     }; 

here complete code:

import android.content.intent; import android.support.v4.app.fragment; import android.os.bundle; import android.util.log; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.textview;  import com.facebook.accesstoken; import com.facebook.accesstokentracker; import com.facebook.callbackmanager; import com.facebook.facebookcallback; import com.facebook.facebookexception; import com.facebook.facebooksdk; import com.facebook.profile; import com.facebook.profiletracker; import com.facebook.login.loginresult; import com.facebook.login.widget.loginbutton;   import static com.facebook.facebooksdk.getapplicationcontext;   /**  * placeholder fragment containing simple view.  */ public class mainactivityfragment extends fragment {     private callbackmanager callbackmanager;     private textview displayname;      private accesstokentracker accesstokentracker;     private profiletracker profiletracker;      private facebookcallback<loginresult> callback = new facebookcallback<loginresult>() {         @override         public void onsuccess(loginresult loginresult) {             accesstoken accesstoken = loginresult.getaccesstoken();             profile profile = profile.getcurrentprofile();             displaymessage(profile);         }          @override         public void oncancel() {          }          @override         public void onerror(facebookexception e) {          }     };        public mainactivityfragment() {     }      @override     public void oncreate(bundle savedinstancestate){         super.oncreate(savedinstancestate);         facebooksdk.sdkinitialize(getactivity().getapplicationcontext());          callbackmanager = callbackmanager.factory.create();          accesstokentracker = new accesstokentracker() {             @override             protected void oncurrentaccesstokenchanged(accesstoken accesstoken, accesstoken accesstoken1) {              }         };          profiletracker = new profiletracker() {             @override             protected void oncurrentprofilechanged(profile oldprofile, profile newprofile) {                 displaymessage(newprofile);             }         };          accesstokentracker.starttracking();         profiletracker.starttracking();     }      @override     public view oncreateview(layoutinflater inflater, viewgroup container,                              bundle savedinstancestate) {          return inflater.inflate(r.layout.fragment_main, container, false);     }      @override     public void onviewcreated(view view, bundle savedinstancestate){         super.onviewcreated(view, savedinstancestate);         loginbutton loginbutton = (loginbutton) view.findviewbyid(r.id.login_button);         displayname = (textview) view.findviewbyid(r.id.displayname);          loginbutton.setreadpermissions("user_friends");         loginbutton.setfragment(this);         loginbutton.registercallback(callbackmanager, callback);     }      @override     public void onactivityresult(int requestcode, int resultcode, intent data) {         super.onactivityresult(requestcode, resultcode, data);         callbackmanager.onactivityresult(requestcode, resultcode, data);      }      private void displaymessage(profile profile){         if(profile != null){             displayname.settext(profile.getname());         }     }      @override     public void onstop() {         super.onstop();         accesstokentracker.stoptracking();         profiletracker.stoptracking();     }      @override     public void onresume() {         super.onresume();         profile profile = profile.getcurrentprofile();         displaymessage(profile);     }   } 

it turns out issues caused not having uses-permission in right place. don't know why allow app work once or twice, did. had make manifest like:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="my.app" >      <uses-permission android:name="android.permission.internet"/>     <application         .... 

before, looked like:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="my.app" >       <application         ....        <uses-permission android:name="android.permission.internet"/>