Not able to get value in Using DropDownField in Flutter

Question

I am using below DropDownField code to for countries listing, But I am not able to store the value in the String selectedValue. I am using DropDownField dependency in flutter.

List<String> countries = [
    'FRANCE',
    'USA',
    'JAPAN',
  ];

String selectedValue;
    DropDownField( icon: Icon(Icons.map),
                  required: false,
                              hintText: 'Choose a country',
                              labelText: 'Country',
                              items: countries,
                              setter: (dynamic newValue) {
                                setState(() {

                                  selectedValue = newValue;
                                });
                              }),

Answer 1

You should use onChanged to get value from DropDown.

 DropDownField( icon: Icon(Icons.map),
                  required: false,
                              hintText: 'Choose a country',
                              labelText: 'Country',
                              items: countries,
                              onChanged:(value){
                                   print(value)
                              }
                              }),