java - How to remove all views and add again? -

i creating views show events. retrieving records database , showing events based on records. events getting created now.

now want remove views when records deleted. if delete record view getting created in fragment.

i have add event activity in add , delete record. record gets deleted in database still can see view after finish(); activity.

creating views:

 private void createevent(layoutinflater inflater, viewgroup dayplanview, int fromminutes, int tominutes, string title,string location,final int id) {      final view eventview = inflater.inflate(r.layout.event_view, dayplanview, false);     relativelayout.layoutparams layoutparams = (relativelayout.layoutparams) eventview.getlayoutparams();      container = (relativelayout) eventview.findviewbyid(r.id.container);     textview tvtitle = (textview) eventview.findviewbyid(r.id.textviewtitle);       if (tvtitle.getparent() != null)        ((viewgroup) tvtitle.getparent()).removeview(tvtitle);      if(location.equals(""))     {         tvtitle.settext("event : " + title);      }     else     {         tvtitle.settext("event : " + title + " (at : " + location +")");     }      int distance = (tominutes - fromminutes);     layoutparams.topmargin = dptopixels(fromminutes + 9);     layoutparams.height = dptopixels(distance);      eventview.setlayoutparams(layoutparams);     dayplanview.addview(eventview);     container.addview(tvtitle);    //  eventview.settag(tag);     eventview.setonclicklistener(new view.onclicklistener() {          @override         public void onclick(view v) {              = new intent(getactivity(), addeventactivity.class);             editmode = true;             i.putextra("editmode", editmode);             int tag = 0;             //  tag =(int)v.gettag();             //  i.putextra("tag",tag);             //   eventdata e =new eventdata();             // int id=0;/ id = e.getid();             i.putextra("id", id);             startactivityforresult(i, 1);          }     }); }  @override public void onactivityresult(int requestcode, int resultcode, intent data) {     super.onactivityresult(requestcode, resultcode, data);     removeview();     showevents(); }  public void showevents() {     mdb = new eventtablehelper(getactivity());     events = mdb.getallevents("mon");      int tag = 0;      (eventdata eventdata : events) {          int id = eventdata.getid();          string datefrom = eventdata.getfromdate();          if (datefrom != null) {              string[] times = datefrom.substring(11, 16).split(":");             minutesfrom = integer.parseint(times[0]) * 60 + integer.parseint(times[1]);         }         string title = eventdata.gettitle();         string location = eventdata.getlocation();          string dateto = eventdata.gettodate();          if (dateto != null) {             //times = dateto.substring(11,16).split(":");             string[] times1 = dateto.substring(11, 16).split(":");             minutesto = integer.parseint(times1[0]) * 60 + integer.parseint(times1[1]);         }         createevent(inflater, dayplanview, minutesfrom, minutesto, title, location, id);         tag++;         id++;     }  } 

tried remove view :

  public void removeview() {     arraylist<view> list = new arraylist<view>();      for(int i=0; i<list.size(); i++)     {         dayplanview.removeallviews();     } } 

dayplanview viewgroup

    dayplanview = (viewgroup) view.findviewbyid(r.id.hoursrelativelayout); 

still can see view. whats going wrong please?

edit:

exception:

java.lang.runtimeexception: failure delivering result resultinfo{who=null, request=131073, result=-1, data=intent { cmp=com.example.siddhi.timetablelayout/.addeventactivity (has extras) }} activity {com.example.siddhi.timetablelayout/com.example.siddhi.timetablelayout.mainactivity}: java.lang.nullpointerexception: attempt invoke virtual method 'void android.widget.relativelayout.removeallviews()' on null object reference 02-05 08:02:37.871 29485-29485/com.example.siddhi.timetablelayout e/androidruntime: @ android.app.activitythread.deliverresults(activitythread.java:3574)

at : parent.removeallviews();

you don't need dayplanview.removeallviews(); in loop. , code looks loop not entered since size of list 0. need:

public void removeview() {     dayplanview.removeallviews(); }