Custom ListView with checkbox changes position while scrolling in android -


i new android , working on web view demo, have implemented it. problem me when check check box , scrolling list view , checked position changes.

i have tried links stack on flow no luck, request can me resolve issue, please adapter below,

adapter

    public class filteradapter extends baseadapter {          private static final int type_item = 0;         private static final int type_separator = 1;         private static final int type_max_count = type_separator + 1;          private arraylist<string> mdata = new arraylist<string>();         private layoutinflater minflater;          private treeset<integer> mseparatorsset = new treeset<integer>();          public filteradapter(context context) {             minflater = (layoutinflater) context.getsystemservice(context.layout_inflater_service);         }          public void additem(final string item) {             mdata.add(item);             notifydatasetchanged();         }          public void addseparatoritem(final string item) {             mdata.add(item);             // save separator position             mseparatorsset.add(mdata.size() - 1);             notifydatasetchanged();         }          @override         public int getitemviewtype(int position) {             return mseparatorsset.contains(position) ? type_separator : type_item;         }          @override         public int getviewtypecount() {             return type_max_count;         }          public int getcount() {             return mdata.size();         }          public string getitem(int position) {             return mdata.get(position);         }          public long getitemid(int position) {             return position;         }          public view getview(int position, view convertview, viewgroup parent) {             viewholder holder = null;             int type = getitemviewtype(position);             system.out.println("getview " + position + " " + convertview + " type = " + type);              if (convertview == null) {                 holder = new viewholder();                 switch (type) {                     case type_item:                         convertview = minflater.inflate(r.layout.raw_filter, null);                         holder.textview = (textview) convertview.findviewbyid(r.id.tv_filter);                         holder.chk_filter = (checkbox) convertview.findviewbyid(r.id.chk_filter);                         break;                     case type_separator:                         convertview = minflater.inflate(r.layout.raw_headr, null);                         holder.textview = (textview) convertview.findviewbyid(r.id.tv_hdr);                         break;                 }                 convertview.settag(holder);             } else {                 holder = (viewholder) convertview.gettag();             }             holder.textview.settext(mdata.get(position));             return convertview;         }  }  class viewholder {     public textview textview;     public checkbox chk_filter; }

add clicklistener in getview() method, fix set checked box in entire listview this:

checkboxselected.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view v) {                 instrumentclicklistener.oncheckboxclick(instrumentdto, checkboxselected.ischecked(), position);                 log.d(tag, "checked instruments check: " + checkboxselected.ischecked() + " \ninstrument: " + position);             }         });

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