Complete Code For Change Radio Button Color In Flutter
import 'package:flutter/material.dart'; void main() { runApp(new MaterialApp( debugShowCheckedModeBanner: false, home: new MyApp(), )); } class GroupModel { String text; int index; bool selected; GroupModel({this.text, this.index, this.selected}); } class MyApp extends StatefulWidget { @override _State createState() => new _State(); } class _State extends State<MyApp> { int _value2 = 0; List<GroupModel> _group = [ GroupModel(text: "None", index: 1, selected: true), GroupModel(text: "CallListo", index: 2, selected: false), GroupModel(text: "Ganymede", index: 3, selected: false), ]; Widget makeRadioTiles() { List<Widget> list = new List<Widget>(); for (int i = 0; i < _group.length; i++) { list.add(new RadioListTile( value: _group[i].index, groupValue: _value2, selected: _group[i].selected, onChanged: (val) { setState(() { for (int i = 0; i < _group.length; i++) { _group[i].selected = false; } _value2 = val; _group[i].selected = true; }); }, activeColor: Colors.red, title: new Text( ' ${_group[i].text}', style: TextStyle( color: _group[i].selected ? Colors.black : Colors.grey, fontWeight: _group[i].selected ? FontWeight.bold : FontWeight.normal), ), )); } Column column = new Column( children: list, ); return column; } @override Widget build(BuildContext context) { return new Scaffold( appBar: new AppBar( centerTitle: true, backgroundColor: Colors.red, title: new Text('Radio Button'), ), body: new Container( padding: new EdgeInsets.all(32.0), child: new Center( child: new Column( children: <Widget>[makeRadioTiles()], ), ), ), ); } }