Android Facebook Login Prolem -

i followed steps in website:

https://developers.facebook.com/docs/getting-started/facebook-sdk-for-android/3.0/

the result on simulator correct(it show "hello + name").

but when test application on phone,

it show nothing.

can tell me what's wrong,thanks!!

following code:

  @override    public void oncreate(bundle savedinstancestate) {      super.oncreate(savedinstancestate);      setcontentview(r.layout.activity_main);      // start facebook login      session.openactivesession(this, true, new session.statuscallback() {        // callback when session changes state        @override        public void call(session session, sessionstate state, exception exception) {          if (session.isopened()) {            // make request /me api            request.executemerequestasync(session, new request.graphusercallback() {              // callback after graph api response user object              @override              public void oncompleted(graphuser user, response response) {               if (user != null) {                 textview welcome = (textview) findviewbyid(r.id.welcome);                 welcome.settext("hello " + user.getname() + "!");               }             }           });         }       }     });   }    @override   public void onactivityresult(int requestcode, int resultcode, intent data) {       super.onactivityresult(requestcode, resultcode, data);       session.getactivesession().onactivityresult(this, requestcode, resultcode, data);   }