Checkbox form validation

Question

How can I validate a checkbox in a Flutter Form? Every other validation works fine, but the checkbox doesn\'t show an Error. Here is my code:

FormFi         


        

Answer 1

You could try something like this :

CheckboxListTile(
  value: checkboxValue,
  onChanged: (val) {
    setState(() => checkboxValue = val
  },
  subtitle: !checkboxValue
      ? Text(
          'Required.',
          style: TextStyle(color: Colors.red),
        )
      : null,
  title: new Text(
    'I agree.',
    style: TextStyle(fontSize: 14.0),
  ),
  controlAffinity: ListTileControlAffinity.leading,
  activeColor: Colors.green,
);