title: How to loop objects inside of list in ListView.Builder
body: <p>I am doing looping over the list items in ListView.builder</p>
  <pre><code>List _rBoxes = new List();//declare
  </code></pre>
  <p>the data i want to loop is seems like this:</p>
  <pre><code>{    
      &quot;box_content&quot;: {
          &quot;box_1&quot;: [
              {
                  &quot;id&quot;: &quot;9&quot;,
                  &quot;name&quot;: &quot;abc&quot;
              },
              {
                  &quot;id&quot;: &quot;10&quot;,
                  &quot;name&quot;: &quot;xyz&quot;
              }
          ],
          &quot;box_2&quot;: [
              {
                  &quot;id&quot;: &quot;8&quot;,
                  &quot;name&quot;: &quot;acc&quot;
              }
          ],
          &quot;box_3&quot;: [
              {
                  &quot;id&quot;: &quot;1&quot;,
                  &quot;name&quot;: &quot;abc&quot;
              }
          ],
          &quot;box_4&quot;: [
              {
                  &quot;id&quot;: &quot;4&quot;,
                  &quot;name&quot;: &quot;amno&quot;
              },
              {
                  &quot;id&quot;: &quot;6&quot;,
                  &quot;name&quot;: &quot;jkl&quot;
              }
          ],
          &quot;box_5&quot;: [
              {
                  &quot;id&quot;: &quot;7&quot;,
                  &quot;name&quot;: &quot;xre&quot;
              }
          ]
      }    
  }
  </code></pre>
  <p>then i add this items to the list</p>
  <pre><code>_rBoxes.addAll(data['box_content']);//it gives error - Unhandled Exception: type '_InternalLinkedHashMap&lt;String, dynamic&gt;' is not a subtype of type 'Iterable&lt;dynamic&gt;'
  </code></pre>
  <p>//widget design</p>
  <pre><code>ListView.builder(
                          physics: NeverScrollableScrollPhysics(),
                          itemCount: _rBoxItems.length,
                          itemBuilder: (BuildContext context, int index) {
                            return Text(&quot;${_rBoxItems[index]}&quot;,
                                style: TextStyle(fontSize: 20.0));
                          })
  </code></pre>
  <p>Error :
  //here i want to loop box_1 index (only) in list view, how to acheive this if i gave
  <code>_rBoxItems['box_1'].length</code> the error will occur . actucally am stuck in this scenario, help me to resolve this problem.</p>