title: Incomplete file Json
body: <p>Why when I add a list of one component does not "[]"?</p>
  
  <pre><code> try {
              json.accumulate("name_channel", txt_channel.getText().toString());
              json.accumulate("channel_date", new Date().toString());
              JSONArray jsonArray = new JSONArray();
              JSONObject idJSON = new JSONObject();
              idJSON.accumulate("id",MainActivity.id_user);
              json.accumulate("list_users", idJSON);
          } catch (JSONException e) {
              e.printStackTrace();
          }
  </code></pre>
  
  <p>It generates the following:</p>
  
  <pre><code>{"name_channel":"xxx","channel_date":"Sat Feb 18 12:00:27 GMT+01:00 2017","list_users":{"id":"1445353654356"}}
  </code></pre>
  
  <p>but I need: <strong>with [ ]</strong></p>
  
  <pre><code>{"name_channel":"xxx","channel_date":"Sat Feb 18 12:00:27 GMT+01:00 2017","list_users":[{"id":"1445353654356"}]}
  </code></pre>