android - Empty listview displayed after doing filter operation -

i have dropdown in layout filter listviewes, used onoptionsitemselected method filter listviewes,now filter eventlistviewes using displayeventlist() method.but unfortunately filtered listview not displayed in layout(after filter operation eventlistview filtered may not displayed in layout),please me solve problem.

    public boolean onoptionsitemselected(menuitem item) {         log.d("onoptionsitemselected", "yes");          switch (item.getitemid()) {             case r.id.all:                 displayeventinvitationlist(inflater, container,savedinstancestate);                 return true;             case r.id.event:                 displayeventlist(inflater, container,savedinstancestate);                 return true;             case r.id.invitation:                 displayinvitationlist(inflater, container,savedinstancestate);                 return true;             default:                 return super.onoptionsitemselected(item);          }      }      public view displayeventlist(layoutinflater inflater, viewgroup container,bundle savedinstancestate) {         super.oncreate(savedinstancestate);         view = inflater.inflate(r.layout.chatwindow_tab, container, false);         context = getactivity().getapplicationcontext();         sharedpreferences = context.getsharedpreferences(constants.shared_preference_name,                 context.mode_private);         databasehelper dbhelper = new databasehelper(context);         usermo = dbhelper.getringeeuserdata(1);         new asynctask<void, void, list<eventmo>>() {             @override             protected list<eventmo> doinbackground(void... arg0) {                 eventmos = gson.fromjson(eventdelegates.getalleventfromuser(usermo, context), new typetoken<list<eventmo>>() {                 }.gettype());                 list<eventmo> groupeventlist = new arraylist<>();                 (eventmo eventmo : eventmos) {                     groupeventlist.add(eventmo);                  }                 return groupeventlist;//it returns eventlist             }              @override             protected void onpostexecute(list<eventmo> groupeventlist) {                 groupeventmolist = groupeventlist;                 chatdisplayadapter = new chatdisplayadapter();                 groupeventview.setadapter(chatdisplayadapter);                 groupeventview.setitemscanfocus(true);                 groupeventview.settextfilterenabled(true);                 groupeventview.setonitemclicklistener(groupeventview.getonitemclicklistener());             }          }.execute(null, null, null);         return view;     }         private class chatdisplayadapter extends baseadapter {          private layoutinflater minflater;         public chatdisplayadapter() {             minflater = (layoutinflater) context.getsystemservice(context.layout_inflater_service);         }          @override         public int getcount() {             return groupeventmolist.size();         }          @override         public object getitem(int position) {             return groupeventmolist.get(position);         }          @override         public long getitemid(int id) {             // sqllite management             return 0;         }          @override         public view getview(int position, view convertview, viewgroup parent) {             if (convertview == null) {                 convertview = minflater.inflate(r.layout.chatwindow, null);                 convertview.setclickable(true);                 convertview.setfocusable(true);                 chattitle = (textview) convertview.findviewbyid(r.id.chat_title);                 chatplace = (textview) convertview.findviewbyid(r.id.event_place);                 chatdate = (textview) convertview.findviewbyid(r.id.event_date);                 chatplace.settext(groupeventmolist.get(position).getplace());                 string actualdate = groupeventmolist.get(position).geteventdate();                 //chatdate.settext(groupeventmolist.get(position).geteventdate());                 try {                     //date format changed here                     date formatdate = new simpledateformat("yyyy-mm-dd").parse(actualdate);                     dateresult = new simpledateformat("dd-mm-yyyy").format(formatdate);                 } catch (parseexception e) {                      e.printstacktrace();                 }                 chatdate.settext(dateresult);                 chattitle.settext(groupeventmolist.get(position).gettext());                 convertview.settag(position);                 view v = convertview.findviewbyid(r.id.chat_window_single);                 v.getrootview().setonclicklistener(new view.onclicklistener() {                     @override                     public void onclick(view v) {                         log.i("position", v.gettag().tostring());                         intent groupact = new intent(context, groupchatactivity.class);                         groupact.addflags(intent.flag_activity_clear_top);                         groupact.putextra("eventmo", groupeventmolist.get(integer.parseint(v.gettag().tostring())));                         startactivity(groupact);                     }                  });             }             return convertview;         }      }  } 

for filtering set adapter updated list , call notifydatasetchanged() on adpater

chatdisplayadapter chatdisplayadapter =new chatdisplayadapter(groupeventlist); chatdisplayadapter.notifydatasetchanged();  

chatdisplayadpater.java

 private class chatdisplayadapter extends baseadapter<eventmo> {          private layoutinflater minflater;         list<eventmo> groupeventmolist;         public chatdisplayadapter(list<eventmo> datagroupeventmolist) {             minflater = (layoutinflater) context.getsystemservice(context.layout_inflater_service);         groupeventmolist=datagroupeventmolist;         }          @override         public int getcount() {             return groupeventmolist.size();         }          @override         public object getitem(int position) {             return groupeventmolist.get(position);         }          @override         public long getitemid(int id) {             // sqllite management             return 0;         }          @override         public view getview(int position, view convertview, viewgroup parent) {             if (convertview == null) {                 convertview = minflater.inflate(r.layout.chatwindow, null);                 convertview.setclickable(true);                 convertview.setfocusable(true);                 chattitle = (textview) convertview.findviewbyid(r.id.chat_title);                 chatplace = (textview) convertview.findviewbyid(r.id.event_place);                 chatdate = (textview) convertview.findviewbyid(r.id.event_date);                 chatplace.settext(groupeventmolist.get(position).getplace());                 string actualdate = groupeventmolist.get(position).geteventdate();                 //chatdate.settext(groupeventmolist.get(position).geteventdate());                 try {                     //date format changed here                     date formatdate = new simpledateformat("yyyy-mm-dd").parse(actualdate);                     dateresult = new simpledateformat("dd-mm-yyyy").format(formatdate);                 } catch (parseexception e) {                      e.printstacktrace();                 }                 chatdate.settext(dateresult);                 chattitle.settext(groupeventmolist.get(position).gettext());                 convertview.settag(position);                 view v = convertview.findviewbyid(r.id.chat_window_single);                 v.getrootview().setonclicklistener(new view.onclicklistener() {                     @override                     public void onclick(view v) {                         log.i("position", v.gettag().tostring());                         intent groupact = new intent(context, groupchatactivity.class);                         groupact.addflags(intent.flag_activity_clear_top);                         groupact.putextra("eventmo", groupeventmolist.get(integer.parseint(v.gettag().tostring())));                         startactivity(groupact);                     }                  });             }             return convertview;         }      }