title: Length of snapshot for Listview on Flutter
body: <p>I'm need implement a ListView on Flutter, and i'm passing snapshot.data.length as a parameter for itemCount:</p>
  
  <pre><code>return ListView.builder(
  itemCount: snapshot.data.length,
  itemBuilder: (context, index) {
  return ListTile(
  title: Text(                            
  snapshot.data[index].data["Identificacao"],...
  </code></pre>
  
  <p>Then i got an error:</p>
  
  <pre><code>I/flutter ( 4647): Class 'List&lt;DocumentSnapshot&gt;' has no instance getter 'length'.
  I/flutter ( 4647): Receiver: Instance(length:1) of '_GrowableList'
  I/flutter ( 4647): Tried calling: length
  </code></pre>
  
  <p>But these sintax are used in many tutorials i have seen. I had tried use:</p>
  
  <pre><code>snapshot.data.documents.length;
  </code></pre>
  
  <p>but the result is the same. Please help me!</p>