Dropdown selection not displaying with Flutter

Question

I\' m gettings items from JSON and displaying them in a dropdown. When the person select an item from the dropdown list, I get the selection but the selected item doesn\'t c

Answer 1

You hard-coded the first city as value for the dropdown.

new DropdownButton(
            value: cities.elementAt(0), //this one
...

You need to have some state variable to hold the selected city.

class YourStatefulWidgetState extends State {
  @override
  initState() {
   super.initState();
   selectedCity = cities.elementAt(0)
  }

 @override
 Widget build(BuildContext context) {
   ...
   new DropdownButton(
            value: selectedCity,
            hint: new Text("Ville"),
            items: cities.map((String value) {
              return new DropdownMenuItem(value: value,
                child: new Row(
                  children: [
                    new Icon(
                      Icons.location_city, color: Colors.deepOrange,),
                    new Text(value)
                  ],
                ),);
            }).toList(),
            onChanged: (String value) {
              setState(() {
                selectedCity = getTravelCity(value);
              });
            },),
     ...