android - Bundel.getString("") at onActivityResult() gives null value -

i working on android application in passing data activity 2 activity 1. passing through intent. problem in activity 1, showing value in bundle, when using bundle.getstring("");, showing me null value. in debugging getting on bundle bundle[{list_size=3}]. code given below, please me out here.

activity 1:

@override     protected void onactivityresult(int requestcode, int resultcode, intent data) {         super.onactivityresult(requestcode, resultcode, data);          if(resultcode==105){             textview txtcounter = (textview) findviewbyid(r.id.txtcounter); // showing value @ mbuddle, @ mbuddle showing null.             bundle mbuddle = data.getextras();             string mmessage = mbuddle .getstring("list_size");             txtcounter.settext(mmessage);         } } 

activity 2:

@override     public void onbackpressed() {         int request_contacts = 105;         intent intent = new intent();         intent.putextra("list_size", flistcontacts.size());         setresult(request_contacts, intent);         finish();     } 

  @override     protected void onactivityresult(int requestcode, int resultcode, intent data) {         super.onactivityresult(requestcode, resultcode, data)          if (requestcode == request_code) {                 if (resultcode == activity.result_ok) {                     string contents = intent.getstringextra(intents.scan.result);                 }} } 

===============

            intent intent = new intent(getintent().getaction());             intent.addflags(intent.flag_activity_clear_when_task_reset);             intent.putextra(key, data);             setresult(result_ok, intent);             finish(); 

result_ok can int value