java - Sub Categories are not showing After Selecting Main Category - Android Studio -


i had wrote php script , sure working fine showing me following json output given below .....

json result

{"categories":[{"id":"1","name":"sub category 1"},{"id":"3","name":"sub category 2"}]}

but problem occurring sub categories not showing when select main caregory spinner.

java code : 

 public void getsubcategory(int cat_id) {         string tag_json_arry = "json_object_req";          jsonobjectrequest req = new jsonobjectrequest(appconstants.getsubcategories(cat_id),                 new response.listener<jsonobject>() {                     @override                     public void onresponse(jsonobject response) {                          try {                             list<string> responselist = new arraylist<string>();                             responselist.add("choose brand");                             jsonarray jsonarray = response.getjsonarray("categories");                             (int = 0; < jsonarray.length(); i++) {                                  jsonobject jsonobject = new jsonobject();                                 jsonobject = jsonarray.getjsonobject(i);                                 responselist.add(jsonobject.getstring("name"));                                  model.categories model = new model.categories();                                 model.setid(jsonobject.getstring("id"));                                 model.setname(jsonobject.getstring("name"));                                  sub_categories.add(model);                              }                             refreshsubcategoryspinner(responselist);                             log.e("msg", response.tostring());                             toast.maketext(getapplicationcontext(), "sucess", toast.length_long).show();                          } catch (exception exp) {                             exp.printstacktrace();                             toast.maketext(getapplicationcontext(), "" + exp.getmessage(), toast.length_long).show();                         }                      }                 }, new response.errorlistener() {             @override             public void onerrorresponse(volleyerror error) {                 toast.maketext(getapplicationcontext(), "error", toast.length_long).show();                  log.e("zoyamsg", error.getmessage());             }         });         appcontroller.getinstance().addtorequestqueue(req, tag_json_arry);     }


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