RadioListTile onchange value is object? type

Issue

I am trying to make multiple choice questions using RadioListTile.

RadioListTile(
  value: 1,
  groupValue: 1,
  onChanged: (val) {
    print("Value");
    print(val.runtimeType);
    setSelectedRadio(val);
  },
  title: Text(snapshot.data!.data()["questions"]["question $i"]["option 1"]),
);

The error I am getting is

The argument type ‘Object?’ can’t be assigned to the parameter type ‘int’. ‘Object’ is from ‘dart:core’. setSelectedRadio(val);

I have checked the runtime type of value and it is returning int.

Solution

Pass int as a generic argument to your RadioListTile.

Replace this

RadioListTile(...)

with this

RadioListTile<int>(...)

Answered By – CopsOnRoad

Answer Checked By – Dawn Plyler (FlutterFixes Volunteer)