android simple alert dialog

package com.example.alertdialogtest;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends Activity {

AlertDialog.Builder builder;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

showDialog();

AlertDialog alert = builder.create();
alert.show();

}

void showDialog() {
//final CharSequence[] items = { "Red", "Green", "Blue" };
final CharSequence[] items = getResources().getStringArray(R.array.countries_array);
builder = new AlertDialog.Builder(this);
builder.setTitle("Set text color");

builder.setItems(items, new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int selectItem) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this,
items[selectItem],
Toast.LENGTH_SHORT).show();
}
});

}

}

////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <string-array name="countries_array">

        

        <item name="bangladesh">bangladesh</item>

        <item name="usa">usa</item>

        <item name="russia">russia</item>

        <item name="england">england</item>

        

    </string-array>

</resources>

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http://www.mediafire.com/?pp0fyijhpm5ks52