android - onPostExecute() isn't getting invoked when the AsyncTask is executed from a nested event listener -

here's trying do: fetch json array remote server , render in list view (in new activity) when item selected list of items in popup. popup created when element in activity clicked/tapped. more specific: activity displays list of categories in grid view. each category has bunch of subcategories shown list of items in popup when user clicks on category. when user selects 1 of items in popup new activity created displays list of items in subcategory. item details fetched remote server json array. have created asynctask fetch item details server when sub-category selected popup. following code snippet this.

public class section extends fragment {     ...      @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {         ...          mgrid.setonitemclicklistener(new adapterview.onitemclicklistener() {             public void onitemclick(adapterview <? > parent, final view v, nt position, long id) {                 ...                  popupmenu popup = new popupmenu(getactivity(), v);                  ...                  popup.setonmenuitemclicklistener(new popupmenu.onmenuitemclicklistener() {                     public boolean onmenuitemclick(menuitem item) {                         new getproductdatafromserver_task().execute(producturl);                         intent intent = new intent(getactivity(), productlistscreen.class);                         startactivity(intent);                          return true;                     }                 });             });         }          return rootview;     } } 

the fragment part of activity used display category list in grid layout.

and, here asynctask fetches jsonarray server.

private class getproductdatafromserver_task extends asynctask < string, long, jsonobject > {      @override     protected jsonobject doinbackground(string...params) {         httpentity httpentity = null;          httpget httpget = null;         try {             defaulthttpclient httpclient = new defaulthttpclient();             httpget = new httpget(params[0]);             httpresponse httpresponse = httpclient.execute(httpget);             httpentity = httpresponse.getentity();         } catch (clientprotocolexception e) {             e.printstacktrace();         } catch (ioexception e) {             e.printstacktrace();         }          // convert httpentity json array         jsonobject jsonobject = null;          if (httpentity != null) {           try {                 string entityresponse = entityutils.tostring(httpentity);                 jsonobject = new jsonobject(entityresponse);             } catch (jsonexception e) {                 e.printstacktrace();             } catch (ioexception e) {                 e.printstacktrace();             } catch (illegalstateexception e) {                 e.printstacktrace();             } catch (exception e) {                 e.printstacktrace();             }         }         return jsonobject;     }      @override     protected void onpostexecute(jsonobject jsonobject) {         try {             jsonarray products = jsonobject.getjsonarray("products");             int numproducts = products.length();             mproductlist = new productinfoforgridview[numproducts];             (int prodidx = 0; prodidx < numproducts; prodidx++) {                 mproductlist[prodidx] = getproductobjfromjsonobj(products.getjsonobject(prodidx));             }         } catch (jsonexception e) {             e.printstacktrace();         }     } } 

the issue facing onpostexecute() isn't getting invoked reason. jsonarray getting fetched server , doinbackground() function completes execution without exceptions. suspect has nested event listeners since works fine if start async task category listener (i.e. in onitemclick() - function invokes nested sub-category listener, setonmenuitemclicklistener()).

thanks in advance answer. have tried descriptive in question. glad provide more details if required.

are sure onpostexecute not running. have tried

yourgridadapter.notifydatasetchanged() in onpostexecute