listview refresh aynctask in android -

i unable refresh listview. know there lots of available this. unable listview refreshed.

lemme edit code little bit showing asynctask

there 2 activities. first activity having list view see being shared , second activity has edit text box (to input inorder share) , button. on clicking button, returns me string json response , need add in previous activity.

now problem is, when refresh first page hitting server gets response not want. should not go server. should add in list view adapter.

i have commented code in postexecute(). have tried everyway not reflecting.

public class shareasynctask extends asynctask<string, void, arraylist<eventsstreambean>> {      public progressdialog pd = new progressdialog(eventstreamactivity.this);      string success_share_val;      @override     protected arraylist<eventsstreambean> doinbackground(             string... result) {         // todo auto-generated method stub           jsonobject jsonobj = new jsonobject(result[0].tostring());          success_share_val = jsonobj.getstring(constants.success);           //checks success value         if(success_share_val.equalsignorecase("1")) {                       jsonarray events_stream_share_array = jsonobj.getjsonarray("streamarray");           if(events_stream_share_array.length() > 0) {                    for(int i=0; i<events_stream_share_array.length(); i++) {                       eventsstreambean events_stream_bean = new eventsstreambean();                       jsonobject events_stream_object = events_stream_share_array.getjsonobject(i);                       events_stream_bean.setstreamid(events_stream_object.getstring(constants.stream_id));                      events_stream_bean.setstreamtype(events_stream_object.getstring(constants.stream_type));                       events_stream_bean.setuserid(events_stream_object.getstring(constants.user_id));                      events_stream_bean.setusername(events_stream_object.getstring(constants.user_name));                      events_stream_bean.setusertype(events_stream_object.getstring(constants.user_type));                      events_stream_bean.setuseravatar(events_stream_object.getstring(constants.user_avatar));                       arraylist_events_stream.add(events_stream_bean);                   }          }else {              log.i("test", "no events streams available");          }          }          }catch(exception e) {}            return arraylist_events_stream;     }      @override     protected void onpreexecute() {         // todo auto-generated method stub         super.onpreexecute();          this.pd.setmessage("loading....");         pd.setcanceledontouchoutside(false);          pd.setcancelable(false);         this.pd.show();     }      @override     protected void onpostexecute(final arraylist<eventsstreambean> result) {         // todo auto-generated method stub         super.onpostexecute(result);          if(this.pd.isshowing()) {             this.pd.dismiss();         }           toast.maketext(eventstreamactivity.this, "post shared successfully", toast.length_short).show();         new eventsstreamasynctask().execute(temp_val);            /*runonuithread(new runnable() {             public void run() {                  //eventstream_customadapter adapter = (eventstream_customadapter) list_view.getadapter();                 //adapter.cleardata();                  adapter.updatedata(result);                 //adapter = new eventstream_customadapter(eventstreamactivity.this, arraylist_events_stream);                 //list_view.setadapter(adapter);                 //adapter.notifydatasetchanged();              }         });*/      }  } 

1. you should call setadapter() once in entire code.

2. then add method in adapter adds more data when want add more data or sets adapter item.

   public void addmoredata(list<string> newitems) { this.list.addall(newitems); } public void setlist(list<string> newlist) { this.list = newlist; } 

3. call notifydatasetchanged() after set new list or add more data.