Localization Example in Android

LocalActivity.java
package com.local;

import java.util.Locale;

import android.app.Activity;
import android.content.res.Configuration;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class LocalActivity extends Activity {
    /** Called when the activity is first created. */
Button mButton;
TextView mTextView;
String language ="";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mButton=(Button)findViewById(R.id.button);
        mTextView=(TextView)findViewById(R.id.txt);
     
        mButton.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub

       Locale locale = null;
       if (language.equalsIgnoreCase("en")) {
           locale = new Locale("en");
       } else if (language.equalsIgnoreCase("es")) {
           locale = new Locale("es");
       }
       Locale.setDefault(locale);
       Configuration config = new Configuration();
       config.locale = locale;
       getBaseContext().getResources().updateConfiguration(config, null);
       mTextView.setText(getString(R.string.app_name));
//        mButton.setText(getString(R.string.app_name));
}
});
       
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu , menu);
        return true;
    }
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case R.id.english:
            language="en";
              break;
              case R.id.spanish:
             language="es";
             break;
        default:
              return super.onOptionsItemSelected(item);
        }
        return true;
}
}
In values folder string.xml
string.xml files
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="app_name">Application Name</string>
</resources>
-----------------------------------------------------------------
in values-es folder string.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, LocalActivity!</string>
    <string name="app_name">nombre de la aplicación</string>
</resources>

in Device select menu option for change language.