OnItemSelectedListener method in Spinner is not called when i set JSON data to Spinner Android -

when select static data spinner, onitemselectedlistener method works fine, when add json data spinner, populates json data , onitemselectedlistener not getting called. problem? here code:

class list_activity extends activity implements onitemselectedlistener {    progressdialog progressdialog;   requestqueue requestqueue;   string json_id;   string json_dept;   list<string> spinner_dept;   list<string> categories;   string selectedcity;    @override   public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_list_);     progressdialog = new progressdialog(this);     progressdialog.setmessage("loading");     progressdialog.show();      // spinner element     spinner spinner = (spinner) findviewbyid(r.id.spinner3);     requestqueue= volley.newrequestqueue(this);      // spinner click listener     spinner.setonitemselectedlistener(this);      // spinner drop down elements      spinner_dept = new arraylist<string>();     categories = new arraylist<string>();     categories.add("automobile");     categories.add("business services");     categories.add("computers");     categories.add("education");     categories.add("personal");     categories.add("travel");      jsonobjectrequest jsonobjectrequest = new jsonobjectrequest(       request.method.get,       "http://192.168.1.104/leave/public/api/department",       null,       new response.listener<jsonobject>() {         @override         public void onresponse(jsonobject response) {           progressdialog.dismiss();           try {             jsonarray jsonarray = response.getjsonarray("data");              (int = 0; < jsonarray.length(); i++) {               jsonobject jsonobject = jsonarray.getjsonobject(i);                string b = jsonarray.getjsonobject(i).getstring("department");               spinner_dept.add(b);                json_id = jsonobject.getstring("identity");               json_dept = jsonobject.getstring("department");                department deprt = new department();                deprt.setid(json_id);               deprt.setdepartment(json_dept);                // spinner_data.add(deprt);                // spinner_dept.add(jsonobject.getstring("department"));                //textview.append( id+" "+ first_name + " " + last_name + "\n");             }           } catch (jsonexception e) {             e.printstacktrace();           }         }       },       new response.errorlistener() {         @override         public void onerrorresponse(volleyerror error) {           log.d("error", "error server response");         }       });      requestqueue.add(jsonobjectrequest);      // creating adapter spinner     arrayadapter<string> dataadapter = new arrayadapter<string>(this, android.r.layout.simple_spinner_item, spinner_dept);      // drop down layout style - list view radio button     dataadapter.setdropdownviewresource(android.r.layout.simple_spinner_dropdown_item);     // attaching data adapter spinner     spinner.setadapter(dataadapter);   }    @override   public void onitemselected(adapterview<?> parent, view view, int position, long id) {     // on selecting spinner item     string item = parent.getitematposition(position).tostring();     // selectedcity = spinner.getselecteditem().tostring();     if (position != 0) {       //put actions here       string ch =spinner_dept.get(position);        toast.maketext(parent.getcontext(), "selected: " + selectedcity, toast.length_long).show();     } else {       // nothing here or toast       toast.maketext(parent.getcontext(), "selected: " , toast.length_long).show();     }      // showing selected spinner item   }    public void onnothingselected(adapterview<?> arg0) {     // todo auto-generated method stub   } } 

you not refreshing adapter after adding data. following changes , work.

// creating adapter spinner final arrayadapter<string> dataadapter = new arrayadapter<string>(this, android.r.layout.simple_spinner_item, spinner_dept);  jsonobjectrequest jsonobjectrequest = new jsonobjectrequest(request.method.get, "http://192.168.1.104/leave/public/api/department"         , null, new response.listener<jsonobject>() {     @override     public void onresponse(jsonobject response) {          progressdialog.dismiss();         try {             jsonarray jsonarray = response.getjsonarray("data");              (int = 0; < jsonarray.length(); i++) {                 jsonobject jsonobject = jsonarray.getjsonobject(i);                  string b = jsonarray.getjsonobject(i).getstring("department");                 spinner_dept.add(b);                  json_id = jsonobject.getstring("identity");                 json_dept = jsonobject.getstring("department");                   department deprt = new department();                  deprt.setid(json_id);                 deprt.setdepartment(json_dept);                 // spinner_data.add(deprt);                 // spinner_dept.add(jsonobject.getstring("department"));                  //textview.append( id+" "+ first_name + " " + last_name + "\n");              }           //add refresh spinner adapter          dataadapter.notifydatasetchanged();          } catch (jsonexception e) {             e.printstacktrace();         }      } }, new response.errorlistener() {     @override     public void onerrorresponse(volleyerror error) {          log.d("error", "error server response");     } }  );   requestqueue.add(jsonobjectrequest);