Syntax

              RadioListTile(
  title: const Text('Option 1'),
  value: 1,
  groupValue: selectedValue,
  onChanged: (value) {
    setState(() {
      selectedValue = value;
    });
  },
),

eg

return Center(
      child: Column(
        children: [
          RadioListTile(
            title: const Text('Pomme'),
            value: 'Pomme',
            groupValue: selectedFruit,
            onChanged: (String? value) {
              setState(() {
                selectedFruit = value;
              });
            },
          ),
          RadioListTile(
            title: const Text('Banane'),
            value: 'Banane',
            groupValue: selectedFruit,
            onChanged: (String? value) {
              setState(() {
                selectedFruit = value;
              });
            },
          ),
          RadioListTile(
            title: const Text('Cerise'),
            value: 'Cerise',
            groupValue: selectedFruit,
            onChanged: (String? value) {
              setState(() {
                selectedFruit = value;
              });
            },
          ),
        ],
      ),
    );