Android dialog with ListView

For implementing a ListView, we first create a xml which contains a ListView named list.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">

  <ListView
    android:id="@+id/listview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    />
</LinearLayout>

Next we create a Dialog Object and inflate the above xml and when the listItem is clicked then a Alert Dialog windows comes
The java file is listed below

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.AdapterView.OnItemClickListener;

public class DialoglistView extends Activity implements OnItemClickListener{
    /** Called when the activity is first created. */
	String[] val = {"sunday","monday","tuesday","thrusday","friday","wednesday","march"};
	ListView list;
	Dialog listDialog;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
         showdialog();
    }

    private void showdialog()
    {
    	listDialog = new Dialog(this);
    	listDialog.setTitle("Select Item");
    	 LayoutInflater li = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    	 View v = li.inflate(R.layout.list, null, false);
    	 listDialog.setContentView(v);
    	 listDialog.setCancelable(true);
         //there are a lot of settings, for dialog, check them all out!

         ListView list1 = (ListView) listDialog.findViewById(R.id.listview);
         list1.setOnItemClickListener(this);
         list1.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, val));
         //now that the dialog is set up, it's time to show it
         listDialog.show();
    }

	public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3)
	{

		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		builder.setMessage("Delete item "+arg2)
		           .setPositiveButton("OK ", new DialogInterface.OnClickListener() {
		           public void onClick(DialogInterface dialog, int id) {
		        	   System.out.println("OK CLICKED");

		           }
		       });
		builder.setNegativeButton("cancel", new DialogInterface.OnClickListener() {
	           public void onClick(DialogInterface dialog, int id) {
	        	 dialog.dismiss();
	        	 listDialog.cancel();

	           }
	       });

		AlertDialog alert = builder.create();
		alert.setTitle("Information");
		alert.show();
	}
}

The alert window look like this

When the Item is selected then