android - can't create multiple choice listview -

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this code can't create multiple choice mode listview. data fetched jason , set in listview. want multiple selection choice mode on list view

public class examview extends listactivity{  private progressdialog pdialog; intent activity; // url contacts json  // json node names private static final string tag_usermst = "products"; private static final string tag_qid = "que_id"; private static final string tag_que = "question"; private static final string tag_qans = "ans"; jsonarray products = null;  // hashmap listview arraylist<hashmap<string, string>> contactlist; protected void oncreate(bundle savedinstancestate) { // todo auto-generated method stub super.oncreate(savedinstancestate); setcontentview(r.layout.user_activity_lv);  contactlist = new arraylist<hashmap<string, string>>();  listview lv = getlistview();     new getcontacts().execute(); } private class getcontacts extends asynctask<void, void, void> {  @override protected void onpreexecute() {     super.onpreexecute();     // showing progress dialog     pdialog = new progressdialog(examview.this);     pdialog.setmessage("exam paper downloading...");     pdialog.setcancelable(false);     pdialog.show();  } @override protected void doinbackground(void... arg0) { // creating service handler class instance servicehandler sh = new servicehandler();  // making request url , getting response string jsonstr = sh.makeservicecall(url, servicehandler.get);  log.d("response: ", "> " + jsonstr);  if (jsonstr != null) {  try {         jsonobject jsonobj = new jsonobject(jsonstr);          // getting json array node         products = jsonobj.getjsonarray(tag_usermst);          // looping through contacts         (int = 0; < products.length(); i++) {             jsonobject c = products.getjsonobject(i);              string queid = c.getstring(tag_qid);             string que = c.getstring(tag_que);             string queans = c.getstring(tag_qans);              // tmp hashmap single contact             hashmap<string, string> product = new hashmap<string, string>();              // adding each child node hashmap key => value             product.put(tag_qid,queid);             product.put(tag_que, que);             product.put(tag_qans, queans);               // adding contact contact list             contactlist.add(product);         }     } catch (jsonexception e) {         e.printstacktrace();     }      } else {         log.e("servicehandler", "couldn't data url");     }      return null; }   @override protected void onpostexecute(void result) {     super.onpostexecute(result);     // dismiss progress dialog     if (pdialog.isshowing())         pdialog.dismiss();     /**      * updating parsed json data listview      * */     listadapter adapter = new simpleadapter(             examview.this, contactlist,             r.layout.user_list_item_lbl, new string[] { tag_qid, tag_que,                     tag_qans }, new int[] { r.id.name,                     r.id.email, r.id.mobile });      setlistadapter(adapter); } } 

 getlistview().setchoicemode(listview.choice_mode_multiple);  setlistadapter(new arrayadapter<string>(mainactivity.this,android.r.layout.simple_list_item_multiple_choice, array_sort));

use code working me. here array_sort arraylist i.e. list of items displayed. multiple items can selected this.


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