Creating an instance of a Volley request by means of an adapter class, and adding it to the queue for execution. Part of http://develop-for-android.blogspot.com.es/2014/01/using-volley-in-your-application_28.html

addingRequest.txt

		String baseUrl = 
		  "http://www.webservicex.net/currencyconvertor.asmx/ConversionRate";
		// using the cached request
		Request<String> request = new CachedStringGETRequest(
				baseUrl + "?fromCurrencyCode=USD&toCurrencyCode=EUR", 
				new ErrorListener() {
					@Override
					public void onErrorResponse(VolleyError error) {
						Log.w("exampleapp", "Exchange rate USD " + 
						"to EUR failed to update. " + error );
					}
		});
		
		Volley.newRequestQueue(this).add(request);