The argument type 'List<dynamic>' can't be assigned to the parameter type &#039-CodePudding

here is basically the entire code which is related to the error I suppose!! I am new to programming as well as Flutter, I tried to splitting the code into widgets so my code be cleaner. that's where I got stuck by this message: The argument type 'List' can't be assigned to the parameter type 'List<Map<String, Object>>'. I hope it's clear now to be checked. thanks!

my Main.dart code

Quiz.dart code

import 'package:flutter/material.dart';
import 'package:quiz2/ui/question.dart';
import 'package:quiz2/ui/quiz.dart';
import 'package:quiz2/ui/result.dart';
import './ui/answer.dart';

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

class MyApp extends StatefulWidget {
  MyApp({Key? key}) : super(key: key);

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  int _index = 0;
  final List _questions = const [
    {
      'questionText': 'who\'s your favorite football player? ',
      'Answers': ['Cristiano', ' Messi', 'Mbappe', 'Benzema']
    },
    {
      'questionText': 'who\'s your favorite Ping Pong player',
      'Answers': [
        'Noshad Alamian',
        'Nima Alamian',
        'Aria Amiri',
        'Matin Lotfollah Nassabi'
      ]
    },
    {
      'questionText': 'what\'s your favorite color',
      'Answers': ['Grey', 'Black', 'Green', 'Red']
    },
    {
      'questionText': 'what\'s your favorite football club',
      'Answers': ['Real Madrid', 'Barcelona', 'Manchester United', 'Liverpool']
    }
  ];
  void _answerQuestion() {
    if (_index < _questions.length) {
      debugPrint('we have more questions');
    } else {
      debugPrint('no more questions');
    }
    setState(() {
      _index = _index   1;
    });
    debugPrint('answered !!');
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          backgroundColor: Color.fromARGB(255, 115, 147, 163),
          title: Text('Quiz App'),
          centerTitle: true,
        ),
        backgroundColor: Colors.blueGrey.shade600,
        body: Container(
            child: _index < _questions.length
                ? Quiz(
                    index: _index,
                    answerQuestion: _answerQuestion,
                    questions: _questions)
                : Result()),
      ),
    );
  }
}

CodePudding user response：

Problem might be with Flutter not properly defining type of your initialized list because you are creating type List (without any further specified generic type).

Change from

 final List _questions = const [ ...

final _questions = const <Map<String,Object>>[ ...

 final List<Map<String,Object>> _questions = const [ ...

Should do the trick