title: Send a JSONArray POST request with android volley library
body: <p>I would like to send and receive a Json Array with volley. 
  Now I can receive an array and it's ok but I don't know how to send a request (For example: with post method).</p>
  
  <pre><code>JsonArrayRequest arrayReq = new JsonArrayRequest(URL,
              new Listener&lt;JSONArray&gt;() {
  }
  </code></pre>