ListItem not displayed in second activity in android -

i have made simple listview demo in android. want when item list selected should displayed on next activity,i have tried following code:

act1.java

package com.example.listview;  import java.util.arraylist;  import android.os.bundle; import android.app.activity; import android.content.intent; import android.view.menu; import android.view.view; import android.widget.adapterview; import android.widget.adapterview.onitemclicklistener; import android.widget.arrayadapter; import android.widget.listview; import android.widget.simpleadapter;  public class mainactivity extends activity { listview ls;     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         ls=(listview)findviewbyid(r.id.lv);         string[] s = {"ahmedabad","baroda","chndigarh","delhi","jharkhand","hariyana","ilahabad","jammu","kashmir","ludhina","mysore","nagpur",                         "odisha","puri","raipur","surat","triveni","udaipur","varanasi"};          //final arraylist<string> list =  new arraylist<string>();              ls.setadapter(new arrayadapter(this, android.r.layout.simple_list_item_1,s));             ls.setonitemclicklistener(new onitemclicklistener() {                  @override                 public void onitemclick(adapterview<?> arg0, view arg1,                         int arg2, long arg3) {                     // todo auto-generated method stub                     intent intent = new intent(mainactivity.this,activity2.class);                     string city=(string) ls.getselecteditem();                     bundle b =new bundle();                     intent.putextra("city", city);                      startactivity(intent);                  }              });           }     } 

act2.java

package com.example.listview;  import android.os.bundle; import android.app.activity; import android.content.intent; import android.view.menu; import android.widget.textview;  public class activity2 extends activity { textview tv;     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_activity2);         tv=(textview)findviewbyid(r.id.textview1);         intent =getintent();         bundle b =getintent().getextras();         string city =b.getstring("city");         tv.settext(city);     }    } 

please help... thanks.

instead of this

 string city=(string) ls.getselecteditem(); 

use this

 string city=arg0.getitematposition(position);