java - login facebook android notworking -

when install app eclipse on real device works ok login face book sample app

but when exporting apk , install manually mobile when hit login hit ok facebook permission again login screen

i don't know why not working apk version

my code :

public class loginactivity extends activity { @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_login);  loginface.setonclicklistener(new view.onclicklistener() {          @override         public void onclick(view arg0) {             // call logout twitter function      // start facebook login     session.openactivesession(loginactivity.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.user_name);                 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); } 

xml file:

     <button     android:id="@+id/btn_fblogin"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:layout_margintop="5dp"/> 

 works me..... 

` session.openactivesession(this, true, new session.statuscallback() {

            // callback when session changes state              @override             public void call(session session, sessionstate state,                     exception exception) {                  request.newmerequest(session, new            request.graphusercallback() {                      @override                     public void oncompleted(graphuser user, response response) {                         }                  }).executeasync();              }          });`