Desde Android como Enviar una petición HTTP POST con variables

public void saveDni(String id, String dni) {   HttpClient httpclient = new DefaultHttpClient();     
	HttpPost httppost = new HttpPost("http://www.yoursite.com/script.php");   try {         
		//Añade las variables a enviar por post         
		List<NameValuePair> postValues = new ArrayList<NameValuePair>(2);         
		postValues.add(new BasicNameValuePair("id", "000001"));         
		postValues.add(new BasicNameValuePair("dni", "23234345T"));   httppost.setEntity(new UrlEncodedFormEntity(postValues));   //Hace la petición         
		HttpResponse response = httpclient.execute(httppost);              
	} 
	catch (ClientProtocolException e) {         
		//TODO Auto-generated catch block     
	} 
	catch (IOException e) {         
		//TODO Auto-generated catch block     
	} 
}