android - transfer data from listview with onclicklistener -

i'm trying create listview onclicklistener, when user click on item on list view start new activity.. how can transfer file listview activity? below code updating json data , updating listview

public void updatejsondata() {     mcommentlist = new arraylist<hashmap<string, string>>();     jsonparser jparser = new jsonparser();      jsonobject json = jparser.getjsonfromurl(read_comments_url);      try {          mcomments = json.getjsonarray(tag_posts);          // looping through posts according json object returned         (int = 0; < mcomments.length(); i++) {              jsonobject c = mcomments.getjsonobject(i);               // gets content of each tag              string title = c.getstring(tag_title);              string content = c.getstring(tag_message);              string username = c.getstring(tag_lname);              string studnum = c.getstring(tag_username);              // creating new hashmap              /**sharedpreferences sp = preferencemanager.getdefaultsharedpreferences(bsitloungeactivity.this);              string fname = sp.getstring("firstname","anon");              string lname = sp.getstring("lasstname","anon");**/               hashmap<string, string> map = new hashmap<string, string>();               map.put(tag_title, title);              map.put(tag_message, content);              map.put(tag_lname, username);              map.put(tag_username, "id:"+studnum);              // adding hashlist arraylist              mcommentlist.add(map);               // annndddd, our json data date same our array              // listw         }      } catch (jsonexception e) {         e.printstacktrace();     } }   private void updatelist() {      listadapter adapter = new simpleadapter(this, mcommentlist,         r.layout.single_post, new string[] { tag_title, tag_message,                 tag_lname,tag_username}, new int[] { r.id.title, r.id.message,                 r.id.username,r.id.username2 });       listview lv = getlistview();         lv.setonitemclicklistener(new onitemclicklistener() {          @override         public void onitemclick(adapterview<?> parent, view view,             int position, long id) {              // method triggered if item click within our             // list. our example won't using this,             // useful know in real life applications.          }     }); }   

can use data inserted in hashmap? , how? please me anyone

use this:

@override public void onitemclick(adapterview<?> parent, view view,         int position, long id) {      intent intent = new intent(mainactivity.this,secondactivity.class);     intent.putextra("key", mcommentlist.get(position).get(tag_username));// same others      startactivity(intent);   } }); 

and retrieve data in second activity on oncreate() method:

intent n = getintent(); string = n.getstringextra("key");