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  String radioValue;
  //
Column(
                children: <Widget>[
                  Row(
                    children: <Widget>[
                      Radio(
                        activeColor: Colors.redAccent,
                        onChanged: (String val) {
                          setRadioValue(val);
                        },
                        value: 'First',
                        groupValue: radioValue,
                      ),
                      Text("Choice1")
                    ],
                  ),
                  Row(
                    children: <Widget>[
                      Radio(
                        activeColor: Colors.redAccent,
                        onChanged: (String val) {
                          setRadioValue(val);
                        },
                        value: 'Second',
                        groupValue: radioValue,
                      ),
                      Text("Choice 2")
                    ],
                  ),
                  Row(
                    children: <Widget>[
                      Radio(

                        activeColor: Colors.redAccent,
                        onChanged: (String val) {
                          setRadioValue(val);
                        },
                        value: 'Third',
                        groupValue: radioValue,
                      ),
                      Text("Choice 3")
                    ],
                  )
                ],
              )
//
setRadioValue(String value) {
    setState(() {
      radioValue=value;
      print(radioValue);
    });
  }