android - losing values from ListView items that have been scrolled out of view -

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i changing textview value using button ,some kind of counter.such as, when clicking add button value increasing , decreasing when clicking minus button , when item scrolled out of view losing value,

adapter class:

   package com.nerdcastle.nazmul.mealdemo;  import android.content.context; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.baseadapter; import android.widget.button; import android.widget.listadapter; import android.widget.textview;  import java.util.arraylist;  /**  * created nazmul on 2/22/2016.  */ public class adapterformealsubmission extends baseadapter implements listadapter {     private arraylist<string> employeenamelist;     private arraylist<string> quantitylist;     private context context;     int count = 0;       public adapterformealsubmission(arraylist<string> employeenamelist, arraylist<string> quantitylist, context context) {         this.employeenamelist = employeenamelist;         this.quantitylist = quantitylist;         this.context = context;     }      @override     public int getcount() {         return employeenamelist.size();     }      @override     public object getitem(int pos) {         return employeenamelist.get(pos);     }      @override     public long getitemid(int pos) {         return pos;     }      private static class viewholder {         public textview nametv;         public button deletebtn;         public button addbtn;         public textview mealcountertv;     }      @override     public view getview(final int position, view convertview, viewgroup parent) {         view view = convertview;         final viewholder holder;         if (view == null) {             layoutinflater inflater = (layoutinflater) context.getsystemservice(context.layout_inflater_service);             view = inflater.inflate(r.layout.custom_row_for_meal_submission, null);             holder = new viewholder();             holder.nametv = (textview) view.findviewbyid(r.id.nametv);             holder.deletebtn = (button) view.findviewbyid(r.id.minus_btn);             holder.addbtn = (button) view.findviewbyid(r.id.add_btn);             holder.mealcountertv = (textview) view.findviewbyid(r.id.countertv);             view.settag(holder);         } else {             holder = (viewholder) view.gettag();         }         holder.nametv.settext(employeenamelist.get(position));         holder.mealcountertv.settext(quantitylist.get(position));         holder.deletebtn.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view v) {                 count = integer.parseint(holder.mealcountertv.gettext().tostring());                 if (count > 0) {                     count--;                 }                 holder.mealcountertv.settext(string.valueof(count));                 //notifydatasetchanged();             }         });         holder.addbtn.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view v) {                 count = integer.parseint(holder.mealcountertv.gettext().tostring());                 count++;                 holder.mealcountertv.settext(string.valueof(count));                 //notifydatasetchanged();             }         });          return view;     } }

how stop loosing values?i have read similar question answer not understanding solution.


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