Hi i have the listview the sixitems in it, but when i call alet function on event it doesnt work ? let me know how to write a function on item event on click?

     public class PhotoListView extends ListActivity {
     String[] listItems = {"HeadShot", "BodyShot ", "ExtraShot", "Video Take1", "Video Take2", "Video Take3", }; 
    @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         setListAdapter(new ArrayAdapter(this,android.R.layout.simple_list_item_1, listItems));
     }

OnListclick

ListView Shot = getListView(); protected void onListItemClick(View view) {

    if(view == Shot){

        AlertDialog.Builder alertbox = new AlertDialog.Builder(this);

        // set the message to display
          alertbox.setMessage("Please Get Ready");

    }