android - Progress Dialog should spin till loading of gridview completed -

i working on 1 android app in want display progress dialog till loading of gridview completed. problem progress dialog spin intial time. stops spinning.

here code.

public class allsites extends activity {      private final string url_select = "http://api.stackexchange.com/2.1/sites?filter=!rgb_y51.*-(yx";     private gridview gview;     private listviewcustomadapter adapter;     private arraylist<object> itemlist = new arraylist<object>();     private itembean bean;     @override     protected void oncreate(bundle savedinstancestate) {         // todo auto-generated method stub         super.oncreate(savedinstancestate);         setcontentview(r.layout.allsites);         //gridview gridview = (gridview) findviewbyid(r.id.gvallsites);         gview = (gridview) findviewbyid(r.id.gvallsites);         new task().execute();       }      private class task extends asynctask<void, void, gzipinputstream> {          private progressdialog progress;           @override         protected void onpreexecute() {              progress = progressdialog.show(allsites.this, "loading", "please wait...");         }          @override         protected gzipinputstream doinbackground(void... params) {              serverdata httpclient = new serverdata();             gzipinputstream zis = httpclient.getserverdata(url_select);             return zis;         }          @override         protected void onpostexecute(gzipinputstream zis) {               parsejson(zis);              if(progress!=null && progress.isshowing()==true)                 progress.dismiss();            }     }      private void parsejson(gzipinputstream zis)     {         gson gson = new gson();          reader reader = new inputstreamreader(zis);          sites response = gson.fromjson(reader, sites.class);          list<items> items = response.getitems();          (items site : items) {             //toast.maketext(allsites.this, site.getapi_site_parameter().tostring(), toast.length_short).show();              addobjecttolist(site.geticon_url(),site.getname());         }          adapter = new listviewcustomadapter(this, itemlist);         gview.setadapter(adapter);     }      public void addobjecttolist(string imageurl, string title)     {         bean = new itembean();          try {             bitmap bitmap = bitmapfactory.decodestream((inputstream)new url(imageurl).getcontent());             bean.setimage(bitmap);         } catch (malformedurlexception e) {             // todo auto-generated catch block             e.printstacktrace();         } catch (ioexception e) {             // todo auto-generated catch block             e.printstacktrace();         }         bean.settitle(title);         itemlist.add(bean);     }  } 

please give me suggestion how can make progress dialog spinning till gridview loaded.

move parsejson function doinbackground event

    @override     protected boolean doinbackground(void... params) {          serverdata httpclient = new serverdata();         gzipinputstream zis = httpclient.getserverdata(url_select);          parsejson(zis);         return true;     }      @override     protected void onpostexecute(boolean zis) {              progress.dismiss();     }