@override
 Widget build(BuildContext context) => new Scaffold(
     body: new Center(
       child: new CountryCodePicker(
         onChanged: print,
         // Initial selection and favorite can be one of code ('IT') OR dial_code('+39')
         initialSelection: 'IT',
         favorite: ['+39','FR'],
         // optional. Shows only country name and flag
         showCountryOnly: false,
         // optional. Shows only country name and flag when popup is closed.
         showOnlyCountryCodeWhenClosed: false,
         // optional. aligns the flag and the Text left
         alignLeft: false,
       ),
     ),
 );

(CountryCode)->dynamic

void _onCountryChange(CountryCode countryCode) {
    //Todo : manipulate the selected country code here
    print("New Country selected: " + countryCode.toString());
  }