Favorite_page.dart

import 'package:flutter/material.dart';

class minumanFav extends StatefulWidget {
  int radioGroupValue = 0;
  @override
  State<minumanFav> createState() => _minumanFavState();
}

class _minumanFavState extends State<minumanFav> {
  int _radioGroupValue = 0;
  String _selectedFavorite = "";
  List<String> _favoriteList = [];
  @override

  void initState(){
    super.initState();
    _favoriteList..add('Jus Kulit Durian')..add('Es Kelapa Bakar')..add('Susu Kukus');
    _radioGroupValue = widget.radioGroupValue;
    _selectedFavorite = _favoriteList[widget.radioGroupValue];
  }

  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Minuman Favorite"),
        actions: [
          IconButton(
            icon: Icon(Icons.check),
            onPressed: (){
              Navigator.pop(context, _selectedFavorite);
            },
          )
        ],
      ),
      body: SafeArea(
        child: Padding(
          padding: const EdgeInsets.all(16),
          child: Column(children: [
            Radio(
              value : 0,
              groupValue: _radioGroupValue,
              onChanged: (index)=>_radioOnchanged(index),
            ),
            Text("Jus Kulit Durian"),
            Radio(
              value : 1,
              groupValue: _radioGroupValue,
              onChanged: (index)=>_radioOnchanged(index),
            ),
            Text("Es Kelapa Bakar"),
            Radio(
              value : 2,
              groupValue: _radioGroupValue,
              onChanged: (index)=>_radioOnchanged(index),
            ),
            Text("Susu Kukus"),
          ]),
        ),
      ),
    );
  }

  void _radioOnchanged(index){
    setState(() {
      _radioGroupValue = index;
      _selectedFavorite = _favoriteList[index];
 });
  }
}