title: Flutter Display Future value in ListView.builder
body: <p>How can I display future value in a Text widget in listview.builder(loop)?. I am calculating distance for each property and want to display in a text widget.</p>
  
  <pre><code>Text('${ _calculateDistance(model, store)' } 
  </code></pre>
  
  <p>Which returns an "Instance of Future" </p>
  
  <pre><code>Future&lt;double&gt; _calculateDistance(MainModel model, Store store) async {
   double distanceInMeters = await Geolocator().distanceBetween(
      model.postion.latitude,
      model.postion.longitude,
      store.position.latitude,
      store.position.longitude);
  return distanceInMeters / 1000;}
  </code></pre>
  
  <p>For a single post I know I can use setstate, but I am caluclatinng distance for each post.</p>