android - Button in a customized listView is not working properly? -

in application i'm using customized listview text view , button change button image. after click button in 1st position, image of button changed when scroll down listview, image set changed other position.

 public class customlistviewadapter_ringtone extends baseadapter {  arraylist<hashmap<string, string>> list; activity activity;  public customlistviewadapter_ringtone(activity activity,arraylist<hashmap<string, string>> list) {     super();     this.activity = activity;     this.list = list; }  @override public int getcount() {     // todo auto-generated method stub     return list.size(); }  @override public object getitem(int position) {     // todo auto-generated method stub     return list.get(position); }  @override public long getitemid(int position) {     // todo auto-generated method stub     return position; }  class viewholder {     button play;     textview tarck_name,singer; }  @override public view getview(final int position, view convertview, viewgroup parent) {     // todo auto-generated method stub      final viewholder holder;      layoutinflater inflater = activity.getlayoutinflater();      if (convertview == null) {          convertview = inflater.inflate(r.layout.test, null);          holder = new viewholder();          holder.tarck_name = (textview)convertview.findviewbyid(r.id.track_name);         holder.singer = (textview)convertview.findviewbyid(r.id.singer);         holder.play = (button)convertview.findviewbyid(r.id.play_pause_btn);          convertview.settag(holder);      } else {          holder = (viewholder) convertview.gettag();      }      hashmap<string, string> map = list.get(position);     holder.tarck_name.settext(map.get("track_name"));     holder.singer.settext(map.get("sing"));      holder.play.settag(position);     holder.play.setonclicklistener(new view.onclicklistener() {          @override         public void onclick(view v) {             // todo auto-generated method stub             holder.play.setbackgroundresource(r.drawable.pausebtn);              //here set background button when scroll down image changed other positon         }     });      return convertview; }    } 

try help:

@override public view getview(final int position, view convertview, viewgroup parent) {      final viewholder holder;     layoutinflater inflater = activity.getlayoutinflater();      convertview = inflater.inflate(r.layout.test, null);      holder = new viewholder();      holder.tarck_name = (textview)convertview.findviewbyid(r.id.track_name);     holder.singer = (textview)convertview.findviewbyid(r.id.singer);     holder.play = (button)convertview.findviewbyid(r.id.play_pause_btn);      convertview.settag(holder);