change type

controller_indice.dart

import 'package:flutter/material.dart';
import 'package:testcheck/modelo.dart';

class ControllerIndice extends ChangeNotifier{
  List<Modelo> modelo =[Modelo(texto: ' show do milh', habilitado: false),
  Modelo(texto: ' show do milh', habilitado: false)];


  void updateState(int index, bool value){
    modelo[index].habilitado = value;
    print('mudou valor');
    notifyListeners();
  }

}

main.dart

import 'package:flutter/material.dart';
import 'package:testcheck/controller/controller_indice.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);
  final String title;
  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  ControllerIndice indice = ControllerIndice();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: AnimatedBuilder(
          animation: indice,
          builder: (context, value) {
            return ListView.builder(
              shrinkWrap: true,
              itemCount: indice.modelo.length,
              itemBuilder: (context, index) {
                return CheckboxListTile(
                  title: Text('${indice.modelo[index].texto}'),
                  value: indice.modelo[index].habilitado,
                  onChanged: (value) {
                    indice.updateState(index,value!);
                  },
                );
              },
            );
          }),
    );
  }
}

modelo.dart

class Modelo {
  String texto;
  bool habilitado;

  Modelo({
    required this.texto,
    required this.habilitado,
  });
}