Different strings.xml resource on Spinner change

Question

I want to change the language as the spinner drop down changes .I have the following code but are not able to change the language of even simple "Hello World".I have values defined in values,values-es and values-fr folder for "hello_world" and "hello" string for each language .What i am doing wrong here.Here is my code below for MainActivity.java

package com.example.changelanguage;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;

import java.util.ArrayList;
import java.util.Locale;

import android.app.Activity;
import android.content.res.Configuration;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SubMenu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
import android.widget.AdapterView.OnItemSelectedListener;
import android.util.*;

public class MainActivity extends Activity {

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

        ArrayList<String> languages = new ArrayList<String>();
        languages.add("English");
        languages.add("French");
        languages.add("Spanish");

        Spinner spinner = (Spinner)findViewById(R.id.spinner1);
        spinner.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item, languages));


        spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
                 Log.v("Value", "Language Value: " + position);
                    if(position == 1){
                         //Change text to Spanish
                        setLocale("es");
                    }
                    else{
                        //Change text to French
                         setLocale("fr");
                    }
                    Toast.makeText(
                            parentView.getContext(), "Selected Lang : " + 
                    parentView.getItemAtPosition(position).toString(), Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onNothingSelected(AdapterView<?> parentView) {
                // your code here
            }

            });


    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }



    public void setLocale(String localeCode){
        Locale locale = new Locale(localeCode);
        Locale.setDefault(locale);
        Configuration config = new Configuration();
        config.locale = locale;
        getBaseContext().getResources().updateConfiguration(config, getBaseContext().getResources().getDisplayMetrics());
    }           

}

Code for the AndroidMainfest.xml is below :-

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.changelanguage"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppBaseTheme" >
        <activity
            android:name="com.example.changelanguage.MainActivity"
            android:label="@string/app_name" 
            android:configChanges="locale">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />                
            </intent-filter>

        </activity>
    </application>

</manifest>

Code for RelativeLayout is :-

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="83dp"
         />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/spinner1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="66dp"
        android:text="@string/hello" />

</RelativeLayout>