publish on wall with Facebook sdk 3.0 and Android -

i've read lots of tutorial , answers here, i'm not capable implement button clicked , publish text on wall (with login done programmatically). tried fragment , 2 buttons, code launches a

05-14 09:26:32.548: e/androidruntime(5080): java.lang.unsupportedoperationexception: session: attempt made request new permissions session has pending request. 

the code is:

private static final list<string> permissions = arrays.aslist("publish_actions"); private static final string pending_publish_key = "pendingpublishreauthorization"; private boolean pendingpublishreauthorization = false; private static final string tag = "mainfragment"; private static final string publish_actions_permission = null; private uilifecyclehelper uihelper; private loginbutton login; private button sharebutton;   private session.statuscallback callback = new session.statuscallback() {     @override     public void call(session session, sessionstate state, exception exception) {         onsessionstatechange(session, state, exception);     } };  @override public view oncreateview(layoutinflater inflater, viewgroup container,bundle savedinstancestate) {     view view = inflater.inflate(r.layout.facebook_fragment, container, false);      sharebutton = (button) view.findviewbyid(r.id.sharebutton);     login=(loginbutton)view.findviewbyid(r.id.loginbutton);     login.setpublishpermissions(permissions);      if (savedinstancestate != null) {         pendingpublishreauthorization =              savedinstancestate.getboolean(pending_publish_key, false);     }     sharebutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {             publishstory();                 }     });     return view; }  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     uihelper = new uilifecyclehelper(getactivity(), callback);     uihelper.oncreate(savedinstancestate); }  @override public void onresume() {     super.onresume();     session session = session.getactivesession();     if (session != null &&             (session.isopened() || session.isclosed()) ) {         onsessionstatechange(session, session.getstate(), null);     }     uihelper.onresume(); }  @override public void onactivityresult(int requestcode, int resultcode, intent data) {     super.onactivityresult(requestcode, resultcode, data);     uihelper.onactivityresult(requestcode, resultcode, data); }  @override public void onpause() {     super.onpause();     uihelper.onpause(); }  @override public void ondestroy() {     super.ondestroy();     uihelper.ondestroy(); }  @override public void onsaveinstancestate(bundle outstate) {     super.onsaveinstancestate(outstate);     outstate.putboolean(pending_publish_key, pendingpublishreauthorization);      uihelper.onsaveinstancestate(outstate); }  private void onsessionstatechange(session session, sessionstate state, exception exception) {     if (state.isopened()) {         log.i(tag, "logged in...");     } else if (state.isclosed()) {         log.i(tag, "logged out...");     }     if (pendingpublishreauthorization &&              state.equals(sessionstate.opened_token_updated)) {         pendingpublishreauthorization = false;         publishstory();     } }  private void publishstory() {     session session = session.getactivesession();      if (session != null){          // check publish permissions             list<string> permissions = session.getpermissions();         if (!issubsetof(permissions, permissions)) {              pendingpublishreauthorization = true;             session.newpermissionsrequest newpermissionsrequest = new session                     .newpermissionsrequest(this, permissions);             session.requestnewpublishpermissions(newpermissionsrequest);             return;         }          bundle postparams = new bundle();         postparams.putstring("name", "facebook sdk android");                 postparams.putstring("caption", "build great social apps , more installs.");                 postparams.putstring("description", "the facebook sdk android makes easier , faster develop facebook integrated android apps.");                 postparams.putstring("link", "https://developers.facebook.com/android");                  request.callback callback= new request.callback() {                     public void oncompleted(response response) {                         jsonobject graphresponse = response.getgraphobject().getinnerjsonobject();                         string postid = null;                         try {                             postid = graphresponse.getstring("id");                         } catch (jsonexception e) {                             log.i(tag,"json error "+ e.getmessage());                         }                         facebookrequesterror error = response.geterror();                         if (error != null) {                             toast.maketext(getactivity().getapplicationcontext(),error.geterrormessage(),toast.length_short).show();                         } else {                             toast.maketext(getactivity().getapplicationcontext(), postid,toast.length_long).show();                         }                     }                 };                  request request = new request(session, "me/feed", postparams, httpmethod.post, callback);                  requestasynctask task = new requestasynctask(request);                 task.execute();     }  } private boolean issubsetof(collection<string> subset, collection<string> superset) {     (string string : subset) {         if (!superset.contains(string)) {             return false;         }     }     return true;     } } 

where's problem? i'm going crazy! much!

i think problem you're explicitly calling onsessionstatechange in onresume method, callback have called anyways (via onactivityresult, when permission request comes back). results in 2 publish permission requests simultaneously, why you're seeing error. try removing onsessionstatechange method in onresume().