在Dart中将对象推入阵列

Question

  List returnMovies = [];

Future<List> _getData() async {

    final response = await http.get("https:../getTodayMovies",
        headers: {HttpHeaders.AUTHORIZATION: Acess_Token.access_token});


    if (response.body != null) {
    returnMovies = json.decode(response.body);
      .....

      setState(() {});
    } else {
       final responseUpcoming = await http.get("/upcoming",
        headers: {HttpHeaders.AUTHORIZATION: Acess_Token.access_token});
        returnMovies = json.decode(responseUpcoming.body);


    }

回应。身体看起来像：

[{"id":394470548,"host_group_name":"heyab redda","movie_image":"..png","type":"horror","code":"X123","name":"Lovely","start_time":1554364800,"end_time":1554393600,"}]

响应Upcoming.body看起来像：

 {"id":394470545,"host_group_name":"foo redda","movie_image":".png","type":"horror","code":"X123","name":"Lovely","start_time":1554364800,"end_time":1554393600,"}, {"id":394470548,"host_group_name":"foo1 redda","movie_image":"..png","type":"comic","code":"X125","name":"Lovely1","start_time":1554364800,"end_time":1554393600,"}

我得到的错误是：String，dynamic不是List类型的子类型

在我执行的第一个API调用中，我通常会返回一个对象数组，但是，当这个数组为空时，第二个API调用将返回一个对象列表，我希望将这些对象放入名为returnMovies的数组中，我如何实现这一点？？有没有办法去。将这些对象按入阵列？？然后我想使用这个数组动态地构建一个Listview。建设者我的声明是否正确？我对飞镖很陌生。非常感谢。




Answer 1

当您执行此操作时，json。解码（response.body）您将获得一个列表的映射您应该使用列表

    movieListData = json.decode(response.body);
    returnMovies = movieListData.map((dynamic movieData) {
          String id = movieData['_id'];
          String host_group_name = movieData['host_group_name'];
          String duration = movieData['duration'];
          return new Movie(id,title, duration);
        }).toList();

Answer 2

我会建议用

returnMovies.addAll({your object here})

Answer 3

听起来你在找addAll

returnMovies.addAll(json.decode(returnUpcoming.body))