java - placing content in expandablelistview with from QR Code Scanned content -

i beginner android...when user scans qr code want replace content of expandablelistview scan result, doesn't seem work.

i displaying result qr scanner in layout works fine.

this code

    format = (textview) view.findviewbyid(r.id.textview9);     button = (button) view.findviewbyid(r.id.button);     button.setonclicklistener(new view.onclicklistener() {     @override     public void onclick(view v) {     intent intent = new intent("com.journeyapps.barcodescanner.captureactivity");     intent.putextra("scan_mode", "product_mode");     startactivityforresult(intent, 1);     }  }); 

scan result listener:

      public void onactivityresult(int requestcode, int resultcode, intent data) {       super.onactivityresult(requestcode, resultcode, data);      if (requestcode == 1) {      if (resultcode == activity.result_ok) {         string contents = data.getstringextra("scan_result");         format.settext("" + contents);     }     else if (resultcode == activity.result_canceled) {         toast toast = toast.maketext(getactivity(), "cancelled", toast.length_short);         toast.show();     }   } } 

class devicelistadapter:

  public class devicelistadapter extends baseexpandablelistadapter { arraylist<string> accesspoints;  public devicelistadapter() {     accesspoints = new arraylist<string>();     grouptitle.add("title"); }  public void setaccesspoints(arraylist<string> rps, arraylist<string> mtype) {     accesspoints = new arraylist<string>(rps);     securitytype = new arraylist<string>(mtype); }  @override public int getgroupcount() {     return 1; }  @override public int getchildrencount(int groupposition) {     return accesspoints.size(); }  @override public object getgroup(int groupposition) {     return null; }  @override public object getchild(int groupposition, int childposition) {     return null; }  @override public long getgroupid(int groupposition) {     return 0; }  @override public long getchildid(int groupposition, int childposition) {     return 0; }  @override public boolean hasstableids() {     return false; }  @override public view getgroupview(int gi, boolean isexpanded, view view, viewgroup parent) {     layoutinflater inflater = (layoutinflater) getactivity().getsystemservice(context.layout_inflater_service);     view = inflater.inflate(r.layout.p_item, null);     textview textview = (textview) view.findviewbyid(r.id.name);     textview.settext(grouptitle.get(a));     return view; }   @override public boolean ischildselectable(int groupposition, int childposition) {     return true; }   @override public view getchildview(int a, int ci, boolean islastchild, view view, final viewgroup parent) {     layoutinflater inflater = (layoutinflater) getactivity().getsystemservice(context.layout_inflater_service);     view = inflater.inflate(r.layout.p_item, null);     textview textview = (textview) view.findviewbyid(r.id.name);     textview.settext(accesspoints.get(a));     textview.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             final dialog dialog = new dialog(getactivity());             dialog.requestwindowfeature(window.feature_no_title);             window window = dialog.getwindow();             windowmanager.layoutparams wlp = window.getattributes();         }          expandablelistview expandablelistview = (expandablelistview) parent;         grouptitle.remove(0);         expandablelistview.collapsegroup(0);         dialog.dismiss();     })      return view; }  }