从api获取JSON列表数据

I am trying to fetch a list of questions from an endpoint that returns json formatted like so:[ { "id": 1, "question": "text", "option1": "text", "option2": "text", "option3": "text", "option4": "text", "answer": "text" }, { "id": 2, "question": "text", "option1": "text", "option2": "text", "option3": "text", "option4": "text", "answer": "text" }]Following the example here, I have a quiz class:class Quiz extends Object with _$QuizSerializerMixin { List<Question> questions; Quiz(this.questions); factory Quiz.fromJson(Map<String, dynamic> json) => _$QuizFromJson(json);}and question class:class Question extends Object with _$QuestionSerializerMixin { final String question; final String option1; final String option2; final String option3; final String option4; final String answer; Question( {this.question, this.option1, this.option2, this.option3, this.option4, this.answer}); factory Question.fromJson(Map<String, dynamic> json) => _$QuestionFromJson(json);}with the function defined as:Future<Quiz> fetchQuiz() async { final response = await http.get('json_endpoint.placeholder/questions'); if (response.statusCode == 200) { return Quiz.fromJson(json.decode(response.body)); } else { throw Exception('Failed to load quiz'); }}how do I pass this into a new instance of quiz? This may be obvious but I am finding it difficult.I have tried declaring a variable as follows:class QuizScreen extends StatefulWidget { @override _QuizScreenState createState() => _QuizScreenState();}class _QuizScreenState extends State<QuizScreen> {Question questionString option1...Quiz quiz = quiz(fetchQuiz());@overridevoid initState() {super.initState();question = quiz.nextQuestion;option1 = question.option1;...Quiz quiz = Quiz(fetchQuiz()); throws an error. 解决方案 The code should look likeFuture foo() async { Quiz quiz = await fetchQuiz();}fetchQuiz() returns a Future<Quiz> and to get the value out, you use await, for that the function that contains the code (foo() in my example) needs to be made async. 这篇关于从api获取JSON列表数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！