在 Dart 中将对象推入数组

  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,"}]

responseUpcoming.body如下所示:

 {"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<dynamic>类型的子类型.

在我正在进行的第一个API调用中，我通常会返回一个对象数组，但是，当此数组为空时，第二个API调用将返回一个对象列表，我希望将这些对象推入名为rereturn Movies的数组中，我如何才能实现这一点呢？有没有办法将这些对象推送到数组中？？因此，我想使用此数组动态构建一个Listview.builder. 还有，我申报的方式对吗？我对DART还是个新手.谢谢