How to get DropdownButtonFormField value with a button click - Flutter - flutter

Question

I am trying to develop a survey form using Flutter and I have multiple dropdown fields in the form. I want to get the selected values from those dropdowns when I click the save button. But all I am getting is the value I initially set inside initState(). The code I am using is as below. Any help to get this sorted out is much appreciated.
class _EditSurveyState extends State<EditSurvey> {
String contactMethod;
String country;
List contactMethodList = ['phone', 'email', 'mail'];
List countryList = ['us', 'uk', 'germany'];
#override
void initState() {
super.initState();
contactMethod = surveryData['contact'];
country = surveryData['country'];
}
#override
Widget build(BuildContext context) {
return Scaffold(
return Scaffold(
children: [
Expanded(
flex: screenWidth(context) < 1300 ? 10 : 8,
child: SafeArea(
child: Column(
children: [
createDropdownField("Contact", contactMethod, contactMethodList),
createDropdownField("Country", country, countryList),
Row(mainAxisAlignment: MainAxisAlignment.end,
children: [
ElevatedButton(
onPressed: () async {
print(contactMethod + country);
},
style: ElevatedButton.styleFrom(
padding: EdgeInsets.symmetric(horizontal: 50),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10)
)
),
child: Text(
"UPDATE",
style: TextStyle(
color: Colors.white,
fontSize: 15.0,
fontWeight: FontWeight.bold,
),
)
),
],
),
]
)
)
)
]
)
);
}
Row createDropdownField(String labelText, String _valueChoose, List valueList) {
return Row (
children: [
SizedBox(height: 25,),
Align(
alignment: Alignment.centerLeft,
child: Text(
'$labelText',
),
),
DropdownButtonFormField(
value: _valueChoose,
hint: Text("$labelText"),
icon: Icon(Icons.arrow_drop_down),
isExpanded: true,
onChanged: (newValue){
setState(() {
_valueChoose = newValue;
});
},
items: valueList.map((valueItem){
return DropdownMenuItem(
value: valueItem,
child: Text(valueItem),
);
}).toList(),
),
],
);
}
}

Answer 1

I don't understand why you using intitstate if you want to initialize value to String you can do it while declaring, try removing initstate and
Declare a variable first where you will store new value from dropdown onchange
i.e
class _EditSurveyState extends State<EditSurvey> {
String _currentValue;
DropdownButtonFormField(
onChanged: (val) =>
setState(() => _currentValue = val as String),
value: _currentValue ,
items: YourList.map((item) {
return DropdownMenuItem(
value: item,
child: Text('$item Items'),
);
}).toList(),
),