Radio button style using icon buttons in flutter

Question

I want to create a radio button style voting system using icons in Flutter (Dart) which looks like this: vote icons

The concept is simple: The page will display a movie, the user can then vote on that movie using the Icon buttons above. When a vote is made, the icon changes to red and the movie is added to an array.

The tricky part which I am struggling with is:

1. Changing the color of the icon after selected
2. Making sure that the other icons remain black
3. Changing the other icons back to black if the user selects a different choice

Thanks in advance!

Answer 1

class Example extends StatefulWidget {
  @override
  _ExampleState createState() => _ExampleState();
}

class _ExampleState extends State<Example> {
  int _selected = null;

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        _icon(0, text: "No way", icon: Icons.face),
        _icon(1, text: "Maybe", icon: Icons.local_movies),
        _icon(2, text: "Looks good", icon: Icons.local_pizza),
        _icon(3, text: "Can't wait", icon: Icons.local_fire_department),
      ],
    );
  }

  Widget _icon(int index, {String text, IconData icon}) {
    return Padding(
      padding: const EdgeInsets.all(16.0),
      child: InkResponse(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(
              icon,
              color: _selected == index ? Colors.red : null,
            ),
            Text(text, style: TextStyle(color: _selected == index ? Colors.red : null)),
          ],
        ),
        onTap: () => setState(
          () {
            _selected = index;
          },
        ),
      ),
    );
  }
}

Answer 2

GestureDetector(
            onTap:() {},
            child: Card(
                elevation: 1,
                child: Padding(
                    padding: EdgeInsets.symmetric(
                        horizontal: 15.w,
                        vertical: 10,
                    ),
                    child: Column(
                        children: [
                            Icon(
                                Icons.ac_unit_outlined,
                                size: 40,
                                color: _valgroup == 1
                                ? Colors.orange
                                : Colors.blue,
                            ),
                            Radio(
                                activeColor: Colors. orange,
                                groupValue: _valgroup,
                                value: 1,
                                onChanged: (int? value) {
                                    if (value != null) {
                                        setState(() {
                                            _valgroup = value;
                                        });
                                    }
                                },
                            ),
                        ],
                    ),
                ),
            ),
        ),