refresh - Stop listview from updating previous items and only update current items -

i new here. few months started learn android , want create listview , parent & child relationship, when clicking parent value in child value should me modified. did. problem when clicking 1st parent it's working fine while clicking 1 values getting refresh.

my code

//int slno = 1; int rs; int pcount =1; int finalrs; string  ip_address, url, tableno, itmename;  private string item_name = "itemname"; private string item_price = "price";  int in,  totalqut ,  totalv;   string strvalp;   //public activity activity;  //initialize variables private static final string str_checked = " has checked!"; private static final string str_unchecked = " has unchecked!"; private int parentclickstatus=-1; private int childclickstatus=-1; private arraylist<parent> parents;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);      resources res = this.getresources();     drawable devider = res.getdrawable(r.drawable.line);            intent intent = getintent();              ip_address  = intent.getstringextra("ip_address");     tableno  = intent.getstringextra("tableno");     itmename =  intent.getstringextra("button_text");       log.e("log_tag"," in ite list pages ");       log.e("log_tag"," ip address : " +ip_address);              log.e("log_tag", " table number : " +tableno);     log.e("log_tag", " manu lict clicked : " +itmename);      url= ip_address;      // set expandablelistview values      getexpandablelistview().setdivider(devider);     getexpandablelistview().setchilddivider(devider);     getexpandablelistview().setdividerheight(1);     getexpandablelistview().setdescendantfocusability(viewgroup.focus_block_descendants);     registerforcontextmenu(getexpandablelistview());        //creating static data in arraylist     final arraylist<parent> dummylist = builddummydata();      // adding arraylist data expandablelistview values     loadhosts(dummylist); }    private arraylist<parent> builddummydata() {     log.e("log_tag"," 1 ");      // todo auto-generated method stub     final arraylist<parent> list = new arraylist<parent>();     // creating arraylist of type parent class store parent class objects      string result1= main_menu_list();        try     {                         jsonarray jarray1 = new jsonarray(result1);                       log.e("log_tag", "json array length  "+jarray1.length());                    (int = 1; < jarray1.length(); i++)         {             //create parent class object             final parent parent = new parent();              // json object parsing                jsonobject json_data = jarray1.getjsonobject(i);               string itemnamej = json_data.getstring("product_name");             string itempricej = json_data.getstring("price");              // set values in parent class object             parent.setslno(i+".");                                                      parent.setitemname(itemnamej);             parent.setprice(itempricej );                  parent.setchildren(new arraylist<child>());             // create child class object              final child child = new child();             child.setprice(itempricej);             child.setqut("1");              //add child class object parent class object             parent.getchildren().add(child);                //adding parent class object arraylist                      list.add(parent);         }      }     catch(jsonexception e)     {         log.e("log_tag", "error parsing data "+e.tostring());     }             return list; } private string main_menu_list()  {     log.e("log_tag"," 2  ");     // todo auto-generated method stub     string result1 = null;      url= url + "rms/sub_manu.php";     arraylist<namevaluepair> postparameters= new arraylist<namevaluepair>();     postparameters.add(new basicnamevaluepair("itmename",itmename));      try      {          string  response1 = customhttpclient.executehttppost(url,postparameters);         result1 = response1.tostring();                    }     catch (exception e)      {         log.e("log_tag","error in http connection!!" + e.tostring());          }     return result1; }      private void loadhosts(arraylist<parent> newparents) {     // todo auto-generated method stub     log.e("log_tag"," 3 ");      if (newparents == null)         return;      parents = newparents;      // check expandablelistadapter object     if (this.getexpandablelistadapter() == null)     {         //create expandablelistadapter object           final myexpandablelistadapter madapter = new myexpandablelistadapter();          // set adapter expandablelist adapter           this.setlistadapter(madapter);     }     else     {         // refresh expandablelistview data          ((myexpandablelistadapter)getexpandablelistadapter()).notifydatasetchanged();     }     }  static class viewholder {     textview slno ;     textview itemname ;     textview price;     imageview rupees;     imageview plu ; }  /**  * custom adapter create parent view (used grouprow.xml) , child view((used childrow.xml).  */ private class myexpandablelistadapter extends baseexpandablelistadapter {     private hashmap<integer, view> childmap = null;     private int count = 1;     private parent parent = null;     private layoutinflater inflater;                 private viewholder holder = null;     private int mpreviousselectedbtnid = -1;     private int mselectedindex = -1;      public myexpandablelistadapter()     {         // create layout inflator         inflater = layoutinflater.from(itemlist.this);         childmap = new hashmap<integer, view>();     }       // function used inflate parent rows view      @override     public view getgroupview(int groupposition, boolean isexpanded,              view convertview, viewgroup parentview)     {         //int i=0;         parent = parents.get(groupposition);          if(convertview == null)         {             holder = new viewholder();             convertview = inflater.inflate(r.layout.grouprow, parentview,false);             holder.itemname = (textview)convertview.findviewbyid(r.id.itemname); // title             holder.price = (textview)convertview.findviewbyid(r.id.price); // description             holder.slno = (textview)convertview.findviewbyid(r.id.slno); // description              holder.rupees=(imageview)convertview.findviewbyid(r.id.rupees); // thumb image             holder.plu = (imageview) convertview.findviewbyid(r.id.plu);             convertview.settag(holder);         }         else         {             holder = (viewholder)convertview.gettag();         }          convertview.setid(groupposition);         holder.plu.setid(groupposition);         holder.itemname.settag(item_name);         holder.price.settag(item_price);          if(parent != null)         {             holder.itemname.settext(parent.getitemname());             holder.price.settext(parent.getprice());                             holder.slno.settext(groupposition+".");         }          holder.plu.setonclicklistener(new onclicklistener() {              @override             public void onclick(view arg0)              {                                    toast.maketext(itemlist.this,"plus button clicked!", toast.length_short).show();                   mselectedindex = arg0.getid();                  if(mpreviousselectedbtnid == arg0.getid())                 {                     count++;                 }                 else                 {                     count = 2;                     mpreviousselectedbtnid = arg0.getid();                 }                  log.d("elist", arg0.getid()+"  >>>. button clicked  "+count);                  log.d("elist", arg0.getid()+"  >>>. button parent  "+(view)arg0.getparent());                  getexpandablelistview().expandgroup(arg0.getid());                  view childview = getexpandablelistadapter().getchildview(arg0.getid(), 0, true, getexpandablelistview().getchildat(arg0.getid()), getexpandablelistview());                   if(childview != null)                  {                     log.d("hash code", "in button click "+childview.hashcode()+"");                     textview qty = (textview) childview.findviewbyid(r.id.qut);                       //************************************************                     // here try parent price value                       //remark :- 1st prent it's show current value when click anothere                       textview topic = (textview) findviewbyid(r.id.price);                                             string totalprice = topic.gettext().tostring();                      //******************************************************                     log.e("log_tag","total price : " +totalprice);                     log.e("log_tag","total quaintity : " +qty.gettext().tostring());                     log.e("log_tag","total price value : " +topic.gettext().tostring());                      string val = qty.gettext().tostring();                      if(qty != null)                     {                          //*****************************************************                         //here calculating price quantity                          qty.settext(count+" ");                           in = integer.valueof(topic.gettext().tostring());                          totalqut = integer.valueof(val);                          system.out.println("total price after conv int :" + totalqut);                          totalv= in*totalqut;                              system.out.println("after  value : "+ totalv);                                                    strvalp = string.valueof(totalv);                           //***********************************************                         log.d("elist", "text view changes called "+ qty.gettag(r.id.qut));                         qty.invalidate();                      }                                      else                     {                         log.d("elist", "text view null");                     }                      ((myexpandablelistadapter)getexpandablelistadapter()).notifydatasetchanged();                 }                 else                 {                     log.d("elist", "chilgdview view null");                 }              }});          return convertview;     }       // function used inflate child rows view     @override      public view getchildview(int groupposition, int childposition, boolean islastchild,              view convertview, viewgroup parentview)     {         final parent parent = parents.get(groupposition);         final child child = parent.getchildren().get(childposition);          // inflate childrow.xml file child rows         convertview = inflater.inflate(r.layout.childrow, parentview, false);          // childrow.xml file elements , set values         ((textview) convertview.findviewbyid(r.id.totalprice)).settext(child.getprice());         textview mqtytext = (textview) convertview.findviewbyid(r.id.qut);          textview s2 = (textview) convertview.findviewbyid(r.id.totalprice);          if(mqtytext!= null)         {             if(mselectedindex == groupposition)             {                 mqtytext.settext(count+"");                  //*******************************                 //setting total price values                   s2.settext(strvalp);                     //*******************************             }              else             {                 mqtytext.settext("1");               }             mqtytext.settag(r.id.qut,"textview "+groupposition);         }          final textview sl = (textview) convertview.findviewbyid(r.id.totalprice);         final textview qut = (textview) convertview.findviewbyid(r.id.qut);         imageview image=(imageview)convertview.findviewbyid(r.id.mins);                  log.d("hash code", convertview.hashcode()+"");          final textview sll = (textview) findviewbyid(r.id.price);          int sllint = integer.valueof(qut.gettext().tostring());          image.setonclicklistener(new onclicklistener() {              @override             public void onclick(view arg0)              {                                    toast.maketext(itemlist.this," mins button clicked!", toast.length_short).show();                  string quantityval = qut.gettext().tostring();                 string quantityval2 = sll.gettext().tostring();                 string totalprice = sl.gettext().tostring();                  log.i("log_tag  value of quantity ",quantityval);                 log.i("log_tag  value of totalprice ",totalprice);                 log.i("log_tag  value of quantity ",quantityval2);                  int in = integer.valueof(sll.gettext().tostring());                 int in2 = integer.valueof(sl.gettext().tostring());                  if ((in2 != 0) && (count != 0))                 {                       // ***************************************                     // here modify value when clicked minus button                      system.out.println("befor value : "+in);                     //in -=in;                         int val = in2 - in;                      system.out.println("after  value : "+in);                      sl.settext(string.valueof(val));                       count--;                      //******************************************                      //string str = (string.valueof(in));                     qut.settext(count+"");                     if(in == 0)                     {                         log.i("log_ tag ","if quantit queal 0");                         sl.settext("0");                         qut.settext("0");                     }                   }              }         });            return convertview;     }       @override     public object getchild(int groupposition, int childposition)     {         return getexpandablelistview().getchildat(groupposition);     }      //call when child row clicked     @override     public long getchildid(int groupposition, int childposition)     {         /****** when child row clicked function call *******/          if( childclickstatus!=childposition)         {             childclickstatus = childposition;             toast.maketext(getapplicationcontext(), "$$$parent :"+groupposition + "**** child :"+childposition , toast.length_long).show();         }            return childposition;     }      @override       public int getchildrencount(int groupposition)     {         int size=0;         log.e("log_tag"," 9  ");         if(parents.get(groupposition).getchildren()!=null)             size = parents.get(groupposition).getchildren().size();         return size;     }      @override     public object getgroup(int groupposition)     {         log.i("parent", groupposition+"=  getgroup ");         return parents.get(groupposition);     }      @override     public int getgroupcount()     {         return parents.size();     }      //call when parent row clicked     @override     public long getgroupid(int groupposition)     {          log.i("parent", groupposition+"=  getgroupid "+parentclickstatus);            if(groupposition==2 && parentclickstatus!=groupposition){              //alert user             toast.maketext(getapplicationcontext(), "parent :"+groupposition ,                      toast.length_long).show();         }          parentclickstatus=groupposition;         if(parentclickstatus==0)             parentclickstatus=-1;          return groupposition;     }       @override     public void notifydatasetchanged()     {         log.e("log_tag"," 13 ");         // refresh list rows         super.notifydatasetchanged();     }      @override     public boolean isempty()     {         log.e("log_tag"," 14 ");         return ((parents == null) || parents.isempty());     }      @override     public boolean ischildselectable(int groupposition, int childposition)     {         log.e("log_tag"," 15 ");         return true;     }      @override     public boolean hasstableids()     {         log.e("log_tag"," 16 ");         return true;     }      @override     public boolean areallitemsenabled()     {         log.e("log_tag"," 17 ");         return true;     } } 

}