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  • 为什么我会出现这个错误；未处理的异常：类型'；双倍'；不是类型为'；int'&引用；在Flatter中解析JSOn数据时？

为什么我会出现这个错误；未处理的异常：类型'；双倍'；不是类型为'；int'&引用；在Flatter中解析JSOn数据时？

json flutter dart

为什么我会出现这个错误；未处理的异常：类型'；双倍'；不是类型为'；int'&引用；在Flatter中解析JSOn数据时？,json,flutter,dart,Json,Flutter,Dart,我想在我的应用程序的页面视图中将youtube缩略图列表显示为横幅列表。 我使用youtube上的视频解析了Json数据，但得到了一个异常“未处理的异常：类型'double'不是类型'int'的子类型” 我将把我所做的一切记下来，并作一个小小的解释 { "home_banners": [ { "movie_id": "youtube_LnNcjFpILQA", "title": &

我想在我的应用程序的页面视图中将youtube缩略图列表显示为横幅列表。 我使用youtube上的视频解析了Json数据，但得到了一个异常“未处理的异常：类型'double'不是类型'int'的子类型”

我将把我所做的一切记下来，并作一个小小的解释

{
  "home_banners": [
    {
      "movie_id": "youtube_LnNcjFpILQA",
      "title": "Andhadhun",
      "tags": [
        "Crime",
        "Thriller"
      ],
      "genres": [
        "5e10bfe2923885a21499490b"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BZWZhMjhhZmYtOTIzOC00MGYzLWI1OGYtM2ZkN2IxNTI4ZWI3XkEyXkFqcGdeQXVyNDAzNDk0MTQ@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/LnNcjFpILQA/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:00:32.613849"
    },
    {
      "movie_id": "youtube_jzKGrOGnERc",
      "title": "Madaari",
      "tags": [
        "Adventure",
        "Drama",
        "Thriller"
      ],
      "genres": [
        "5e10bfdf923885a2149948ff"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BZDFjODM0NDAtNGJkZC00NmRiLWI3NmYtZDFkYmRhYmE4Zjk3XkEyXkFqcGdeQXVyNTIwODMzNjc@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/jzKGrOGnERc/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:00:33.318952"
    },
    
   
    {
      "movie_id": "youtube_886EXj5MXl0",
      "title": "Rakht Charitra 1",
      "tags": [
        "Action",
        "Biography",
        "Crime",
        "Drama",
        "Thriller"
      ],
      "genres": [
        "5e10bfdc923885a2149948f7",
        "5e10bfe2923885a21499490b"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BNDU1NjAxNTMxNF5BMl5BanBnXkFtZTgwNDUzMjk4NTE@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/886EXj5MXl0/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:00:32.000245"
    },
    {
      "movie_id": "youtube_lz1N4r7SGrY",
      "title": "Satyamev Jayate",
      "tags": [
        "Action",
        "Drama",
        "Thriller"
      ],
      "genres": [
        "5e10bfdc923885a2149948f7"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BYzYxNGI3MmYtMWQyMi00NmViLWE0ZWQtNWM5ZTY3NTIxNzU0XkEyXkFqcGdeQXVyODE5NzE3OTE@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/lz1N4r7SGrY/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:00:33.404778"
    },
    {
      "movie_id": "youtube_Pwidjiomr9w",
      "title": "Mohejo Daaro",
      "tags": [
        "Action",
        "Adventure",
        "Drama",
        "History"
      ],
      "genres": [
        "5e10bfdf923885a2149948ff"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BMzBhNTk0MzUtZTc4Yy00NDk3LWE1ZTItYjFmODQ4NTczMGVkL2ltYWdlL2ltYWdlXkEyXkFqcGdeQXVyNDkxMzY0Mjk@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/Pwidjiomr9w/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:00:32.666504"
    }
  ],
  "series": [
    {
      "series_id": "youtube_PLcvCQa6KHYRkR01iUhrTy-Ng0sDy5G3bk",
      "title": "A.I.SHA My Virtual Girlfriend",
      "tags": [
        "Thrillers"
      ],
      "genres": [
        "5e10bfe1923885a214994908"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BNDM0MWRiNWMtMDUxMi00M2Y5LThkYzUtMjkwYmE0ZWE5YTZhXkEyXkFqcGdeQXVyNjY2Mzk3Mzg@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/X3flTlvbfBE/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:25:03.378572"
    },
    {
      "series_id": "youtube_PL4x7Of-X4XhiK_gmCcJF8xfrlQN_46nmj",
      "title": "What the Folks",
      "tags": [
        "Comedy"
      ],
      "genres": [
        "5e10bfde923885a2149948fc"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BZWM4YWYxYjEtZDU1Yi00NjIzLTkwYTItMGQ4MThjNDA2ZDFkXkEyXkFqcGdeQXVyNDAzNDk0MTQ@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/1rQJXDGc6OY/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:25:03.163742"
    },
    {
      "series_id": "youtube_PLxY80KSzpL2NoLLzmWHUJEHk3_J1eWJWw",
      "title": "Bachelors",
      "tags": [
        "Comedy"
      ],
      "genres": [
        "5e10bfde923885a2149948fc"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BYTc2M2U0NDUtNjgzMC00YmI5LTlmOTktZTZlMGRkYTNiODNhXkEyXkFqcGdeQXVyNzEyNTM4MTU@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/5XuimeH5hME/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:25:03.416601"
    },
    {
      "series_id": "youtube_PLjq6DwYksrzz_fsWIpPcf6V7p2RNAneKc",
      "title": "The Age of A.I.",
      "tags": [
        "Documentary"
      ],
      "genres": [
        "5e10bfdf923885a2149948fe"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BMmE3Y2M4YzYtOWRhZS00OTA2LTgyZDUtYTA4MTBkNTRmNThiXkEyXkFqcGdeQXVyNjUxMjc1OTM@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/UwsrzCVZAb8/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 1.0,
      "createdAt": "2020-08-27T15:25:03.385511"
    },
    {
      "series_id": "discoveryplus_jamies-quick-and-easy-food",
      "title": "Jamie's Quick and Easy Food",
      "tags": [
        "Food"
      ],
      "genres": [
        "5e10bfdf923885a2149948fe"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BNGI0ZjZlYTktYzk2OC00MmQwLTgwMmUtYTM2MGZkYTYwNDIyXkEyXkFqcGdeQXVyODc4MDI5MjI@.jpg"
      ],
      "poster_link": "https://ap2-prod-images.disco-api.com/2020/03/06/afecc471-5ad6-4770-bd79-ee5928bda612.jpeg?bf=0&f=jpg&p=true&q=75&w=600",
      "platform": "discoveryplus",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:25:02.745905"
    },
    {
      "series_id": "youtube_PLZFXeozdia12APH8n9xsVNhd5qallmrz2",
      "title": "The Katering Show",
      "tags": [
        "Comedy"
      ],
      "genres": [
        "5e10bfde923885a2149948fc"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BOTU4NjU4NDQwOV5BMl5BanBnXkFtZTgwMTIyNjk1NDE@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/J55vgxNaaBY/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 1.0,
      "createdAt": "2020-08-27T15:25:03.280574"
    },
    {
      "series_id": "youtube_PLTB0eCoUXErb7pV0Sj1hXWrxerSZX1qgh",
      "title": "Kota Factory",
      "tags": [
        "Comedy",
        "Drama"
      ],
      "genres": [
        "5e10bfde923885a2149948fc",
        "5e10bfdf923885a214994900"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BNWFlNTY5MzEtNDhhMy00YTRmLWJhYjMtM2JjODkyMGRkZmUzXkEyXkFqcGdeQXVyOTAzMTc2MjA@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/JWbnEt3xuos/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:25:03.283542"
    },
    {
      "series_id": "discoveryplus_morgan-freemans-through-the-wormhole",
      "title": "Morgan Freeman's Through the Wormhole",
      "tags": [
        "Science"
      ],
      "genres": [
        "5e10bfdf923885a2149948fe"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BMDhkMTY2NGQtMWY4Mi00ZjhmLWIzNGYtZDJhODkwNTM5NTIzXkEyXkFqcGdeQXVyNDk3NDEzMzk@.jpg"
      ],
      "poster_link": "https://ap2-prod-images.disco-api.com/2020/03/04/0bc1cb72-2899-4b5c-b36e-fff7e4ecba6a.jpeg?bf=0&f=jpg&p=true&q=75&w=600",
      "platform": "discoveryplus",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:25:02.742655"
    },
    {
      "series_id": "youtube_PLGzz7pyosmlJfx9ivigemSouoZR9uLT2-",
      "title": "Minus One",
      "tags": [
        "Comedy"
      ],
      "genres": [
        "5e10bfde923885a2149948fc"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BNWU2YWIwYjAtZGEyMS00ZDk1LWFmZWMtOTU1NzMxZGZiMjhjXkEyXkFqcGdeQXVyMTc2NTE3MDM@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/iyL9-EE3ngk/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:25:03.209943"
    },
    {
      "series_id": "youtube_PLcUQLQkgCREYaBc7S_b8Zp0HNJsciE9bA",
      "title": "Mom and Co",
      "tags": [
        "Drama"
      ],
      "genres": [
        "5e10bfdf923885a214994900"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BYmQ1NjEyYmYtODFjZi00ZWZmLTg0NzEtNTRmNTliMjc2ZTVjXkEyXkFqcGdeQXVyMzI3MjU2MTg@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/tPQ85zH-Vr4/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:25:03.373151"
    }
  ],
  "movies": [
    {
      "movie_id": "youtube_Jlnr61dEk3c",
      "title": "Holiday",
      "tags": [
        "Action",
        "Thriller"
      ],
      "genres": [
        "5e10bfdc923885a2149948f7"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BMTVkMzljMzUtZmIxMS00YWNlLTlkNDMtYmU0Nzc3MjU3OGUwXkEyXkFqcGdeQXVyODMyODMxNDY@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/Jlnr61dEk3c/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:00:32.523685"
    },
    
    
    {
      "movie_id": "youtube_HVyXEbOWrp4",
      "title": "Hungama",
      "tags": [
        "Comedy",
        "Drama",
        "Romance"
      ],
      "genres": [
        "5e10bfde923885a2149948fb",
        "5e10bfdf923885a2149948ff"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BNTVjMWY5MGUtNjU2MS00NzgxLWJhZWUtM2VjMDE4YWRkOWFjXkEyXkFqcGdeQXVyODAzNzAwOTU@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/HVyXEbOWrp4/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:00:32.410578"
    },
    {
      "movie_id": "youtube_ye5HlqJtYKA",
      "title": "Golmaal",
      "tags": [
        "Action",
        "Comedy",
        "Drama",
        "Family"
      ],
      "genres": [
        "5e10bfde923885a2149948fb"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BYmE3YmNiM2YtM2MxMi00ZDhmLTk1ZTQtODdjOWY4YjVkYThmXkEyXkFqcGdeQXVyNDUzOTQ5MjY@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/ye5HlqJtYKA/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:00:33.788722"
    },
    {
      "movie_id": "youtube_FX3pmM7Duvs",
      "title": "Garam Masala",
      "tags": [
        "Comedy",
        "Romance"
      ],
      "genres": [
        "5e10bfde923885a2149948fb"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BMTk4ZWVjY2EtYzc4NS00OWVjLTgwMmMtYTAxMDNkNDEwM2QyXkEyXkFqcGdeQXVyODE5NzE3OTE@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/FX3pmM7Duvs/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:00:32.389208"
    },
    {
      "movie_id": "youtube_qdz_wO4YJFU",
      "title": "Rann",
      "tags": [
        "Drama",
        "Mystery",
        "Thriller"
      ],
      "genres": [
        "5e10bfdf923885a2149948ff",
        "5e10bfe1923885a214994907"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BZjZhNzg5NTAtNTBiOC00NmI2LWI1ZDMtNzBhY2Q1ZDg5MzU3XkEyXkFqcGdeQXVyMzU0ODc1MTQ@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/qdz_wO4YJFU/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:00:33.501221"
    },
    {
      "movie_id": "youtube_Pwidjiomr9w",
      "title": "Mohejo Daaro",
      "tags": [
        "Action",
        "Adventure",
        "Drama",
        "History"
      ],
      "genres": [
        "5e10bfdf923885a2149948ff"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BMzBhNTk0MzUtZTc4Yy00NDk3LWE1ZTItYjFmODQ4NTczMGVkL2ltYWdlL2ltYWdlXkEyXkFqcGdeQXVyNDkxMzY0Mjk@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/Pwidjiomr9w/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:00:32.666504"
    },
    {
      "movie_id": "youtube_886EXj5MXl0",
      "title": "Rakht Charitra 1",
      "tags": [
        "Action",
        "Biography",
        "Crime",
        "Drama",
        "Thriller"
      ],
      "genres": [
        "5e10bfdc923885a2149948f7",
        "5e10bfe2923885a21499490b"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BNDU1NjAxNTMxNF5BMl5BanBnXkFtZTgwNDUzMjk4NTE@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/886EXj5MXl0/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0,
      "createdAt": "2020-08-27T15:00:32.000245"
    }
  ],
还有其他的事情，但为了简单起见，我没有写它们

我在中生成后得到的PODO文件如下：

// To parse this JSON data, do
//
//     final homePage = homePageFromJson(jsonString);

import 'dart:convert';

HomePage homePageFromJson(String str) => HomePage.fromJson(json.decode(str));

String homePageToJson(HomePage data) => json.encode(data.toJson());

class HomePage {
  HomePage({
    this.homeBanners,
    this.series,
    this.movies,
    this.musicCategories,
    this.musicPlaylists,
    this.publishers,
    this.liveChannels,
  });

  List<HomeBanner> homeBanners;
  List<HomeBanner> series;
  List<HomeBanner> movies;
  List<Music> musicCategories;
  Music musicPlaylists;
  List<Publisher> publishers;
  List<LiveChannel> liveChannels;

  factory HomePage.fromJson(Map<String, dynamic> json) => HomePage(
    homeBanners: List<HomeBanner>.from(json["home_banners"].map((x) => HomeBanner.fromJson(x))),
    series: List<HomeBanner>.from(json["series"].map((x) => HomeBanner.fromJson(x))),
    movies: List<HomeBanner>.from(json["movies"].map((x) => HomeBanner.fromJson(x))),
    musicCategories: List<Music>.from(json["music_categories"].map((x) => Music.fromJson(x))),
    musicPlaylists: Music.fromJson(json["music_playlists"]),
    publishers: List<Publisher>.from(json["publishers"].map((x) => Publisher.fromJson(x))),
    liveChannels: List<LiveChannel>.from(json["live_channels"].map((x) => LiveChannel.fromJson(x))),
  );

  Map<String, dynamic> toJson() => {
    "home_banners": List<dynamic>.from(homeBanners.map((x) => x.toJson())),
    "series": List<dynamic>.from(series.map((x) => x.toJson())),
    "movies": List<dynamic>.from(movies.map((x) => x.toJson())),
    "music_categories": List<dynamic>.from(musicCategories.map((x) => x.toJson())),
    "music_playlists": musicPlaylists.toJson(),
    "publishers": List<dynamic>.from(publishers.map((x) => x.toJson())),
    "live_channels": List<dynamic>.from(liveChannels.map((x) => x.toJson())),
  };
}

class HomeBanner {
  HomeBanner({
    this.movieId,
    this.title,
    this.tags,
    this.genres,
    this.thumbnail,
    this.posterLink,
    this.platform,
    this.worldwide,
    this.createdAt,
    this.seriesId,
  });

  String movieId;
  String title;
  List<String> tags;
  List<String> genres;
  List<String> thumbnail;
  String posterLink;
  Platform platform;
  int worldwide;
  DateTime createdAt;
  String seriesId;

  factory HomeBanner.fromJson(Map<String, dynamic> json) => HomeBanner(
    movieId: json["movie_id"] == null ? null : json["movie_id"],
    title: json["title"],
    tags: List<String>.from(json["tags"].map((x) => x)),
    genres: List<String>.from(json["genres"].map((x) => x)),
    thumbnail: List<String>.from(json["thumbnail"].map((x) => x)),
    posterLink: json["poster_link"],
    platform: platformValues.map[json["platform"]],
    worldwide: json["WORLDWIDE"],
    createdAt: DateTime.parse(json["createdAt"]),
    seriesId: json["series_id"] == null ? null : json["series_id"],
  );

  Map<String, dynamic> toJson() => {
    "movie_id": movieId == null ? null : movieId,
    "title": title,
    "tags": List<dynamic>.from(tags.map((x) => x)),
    "genres": List<dynamic>.from(genres.map((x) => x)),
    "thumbnail": List<dynamic>.from(thumbnail.map((x) => x)),
    "poster_link": posterLink,
    "platform": platformValues.reverse[platform],
    "WORLDWIDE": worldwide,
    "createdAt": createdAt.toIso8601String(),
    "series_id": seriesId == null ? null : seriesId,
  };
}

enum Platform { YOUTUBE, DISCOVERYPLUS }

final platformValues = EnumValues({
  "discoveryplus": Platform.DISCOVERYPLUS,
  "youtube": Platform.YOUTUBE
});

class LiveChannel {
  LiveChannel({
    this.keyId,
    this.postContent,
    this.publisherId,
    this.publisherName,
    this.publisherProfilePic,
    this.publisherDesc,
    this.downvotesCount,
    this.upvotesCount,
  });

  String keyId;
  PostContent postContent;
  String publisherId;
  String publisherName;
  String publisherProfilePic;
  String publisherDesc;
  int downvotesCount;
  int upvotesCount;

  factory LiveChannel.fromJson(Map<String, dynamic> json) => LiveChannel(
    keyId: json["key_id"],
    postContent: PostContent.fromJson(json["post_content"]),
    publisherId: json["publisher_id"],
    publisherName: json["publisher_name"],
    publisherProfilePic: json["publisher_profile_pic"],
    publisherDesc: json["publisher_desc"],
    downvotesCount: json["downvotes_count"],
    upvotesCount: json["upvotes_count"],
  );

  Map<String, dynamic> toJson() => {
    "key_id": keyId,
    "post_content": postContent.toJson(),
    "publisher_id": publisherId,
    "publisher_name": publisherName,
    "publisher_profile_pic": publisherProfilePic,
    "publisher_desc": publisherDesc,
    "downvotes_count": downvotesCount,
    "upvotes_count": upvotesCount,
  };
}

class PostContent {
  PostContent({
    this.shortcode,
    this.platformVideoLink,
    this.caption,
    this.description,
  });

  String shortcode;
  String platformVideoLink;
  String caption;
  String description;

  factory PostContent.fromJson(Map<String, dynamic> json) => PostContent(
    shortcode: json["shortcode"],
    platformVideoLink: json["platform_videoLink"],
    caption: json["caption"],
    description: json["description"],
  );

  Map<String, dynamic> toJson() => {
    "shortcode": shortcode,
    "platform_videoLink": platformVideoLink,
    "caption": caption,
    "description": description,
  };
}

class Music {
  Music({
    this.id,
    this.country,
    this.categoryId,
    this.categoryName,
    this.categoryIcons,
    this.playlists,
  });

  dynamic id;
  String country;
  String categoryId;
  String categoryName;
  List<CategoryIcon> categoryIcons;
  List<Playlist> playlists;

  factory Music.fromJson(Map<String, dynamic> json) => Music(
    id: json["_id"],
    country: json["country"],
    categoryId: json["category_id"],
    categoryName: json["category_name"],
    categoryIcons: List<CategoryIcon>.from(json["category_icons"].map((x) => CategoryIcon.fromJson(x))),
    playlists: List<Playlist>.from(json["playlists"].map((x) => Playlist.fromJson(x))),
  );

  Map<String, dynamic> toJson() => {
    "_id": id,
    "country": country,
    "category_id": categoryId,
    "category_name": categoryName,
    "category_icons": List<dynamic>.from(categoryIcons.map((x) => x.toJson())),
    "playlists": List<dynamic>.from(playlists.map((x) => x.toJson())),
  };
}

class CategoryIcon {
  CategoryIcon({
    this.height,
    this.url,
    this.width,
  });

  int height;
  String url;
  int width;

  factory CategoryIcon.fromJson(Map<String, dynamic> json) => CategoryIcon(
    height: json["height"] == null ? null : json["height"],
    url: json["url"],
    width: json["width"] == null ? null : json["width"],
  );

  Map<String, dynamic> toJson() => {
    "height": height == null ? null : height,
    "url": url,
    "width": width == null ? null : width,
  };
}

class Playlist {
  Playlist({
    this.playlistName,
    this.playlistDescription,
    this.playlistUrl,
    this.playlistTotalTracks,
    this.playlistImages,
    this.playlistFollowers,
    this.playlistId,
  });

  String playlistName;
  String playlistDescription;
  String playlistUrl;
  int playlistTotalTracks;
  List<CategoryIcon> playlistImages;
  int playlistFollowers;
  String playlistId;

  factory Playlist.fromJson(Map<String, dynamic> json) => Playlist(
    playlistName: json["playlist_name"],
    playlistDescription: json["playlist_description"],
    playlistUrl: json["playlist_url"],
    playlistTotalTracks: json["playlist_total_tracks"],
    playlistImages: List<CategoryIcon>.from(json["playlist_images"].map((x) => CategoryIcon.fromJson(x))),
    playlistFollowers: json["playlist_followers"],
    playlistId: json["playlist_id"],
  );

  Map<String, dynamic> toJson() => {
    "playlist_name": playlistName,
    "playlist_description": playlistDescription,
    "playlist_url": playlistUrl,
    "playlist_total_tracks": playlistTotalTracks,
    "playlist_images": List<dynamic>.from(playlistImages.map((x) => x.toJson())),
    "playlist_followers": playlistFollowers,
    "playlist_id": playlistId,
  };
}

class Publisher {
  Publisher({
    this.platform,
    this.username,
    this.fullName,
    this.profilePicUrl,
    this.content,
    this.keyId,
  });

  Platform platform;
  String username;
  String fullName;
  String profilePicUrl;
  Content content;
  String keyId;

  factory Publisher.fromJson(Map<String, dynamic> json) => Publisher(
    platform: platformValues.map[json["platform"]],
    username: json["username"],
    fullName: json["full_name"],
    profilePicUrl: json["profile_pic_url"],
    content: Content.fromJson(json["content"]),
    keyId: json["key_id"],
  );

  Map<String, dynamic> toJson() => {
    "platform": platformValues.reverse[platform],
    "username": username,
    "full_name": fullName,
    "profile_pic_url": profilePicUrl,
    "content": content.toJson(),
    "key_id": keyId,
  };
}

class Content {
  Content({
    this.description,
  });

  String description;

  factory Content.fromJson(Map<String, dynamic> json) => Content(
    description: json["description"],
  );

  Map<String, dynamic> toJson() => {
    "description": description,
  };
}

class EnumValues<T> {
  Map<String, T> map;
  Map<T, String> reverseMap;

  EnumValues(this.map);

  Map<T, String> get reverse {
    if (reverseMap == null) {
      reverseMap = map.map((k, v) => new MapEntry(v, k));
    }
    return reverseMap;
  }
}
这是主文件的页面视图。我有

_buildPageView(var boxHeight) {
    return Container(
      color: Colors.black87,
      height: boxHeight,
      child: PageView.builder(
          itemCount: _items.length,
          controller: _pageController,
          itemBuilder: (BuildContext context, int index) {
            try {
              HomeBanner homeBanner=_homeBannelList[index];
              return FadeInImage.assetNetwork(
                image:
                    'https://img.youtube.com/vi/${homeBanner.movieId.substring(8)}/0.jpg',
                placeholder: cupertinoActivityIndicator,
                fit: BoxFit.fill,
              );
            } catch (e) {
              return CircularProgressIndicator();
            }
            //before return Image.network('https://img.youtube.com/vi/${videoIdOfUrlList[index]}/0.jpg',fit: BoxFit.fill,);
          },
          onPageChanged: (int index) {
            _currentPageNotifier.value = index;
          }),
    );
  }
相关线路为'https://img.youtube.com/vi/${homeBanner.movieId.substring（8）}/0.jpg'，其中homeBanner的内容被计算出来

>>

完整的Json数据可以在这里找到

“为什么我在flift中解析Json数据时出现此错误”未处理的异常：类型“double”不是类型“int”的子类型？”：

您正在使用
int
：

int worldwide;
将
int-worldwide
更改为
double-worldwide
worldwide
是
double
而不是
int

  {
      "movie_id": "youtube_Jlnr61dEk3c",
      "title": "Holiday",
      "tags": [
        "Action",
        "Thriller"
      ],
      "genres": [
        "5e10bfdc923885a2149948f7"
      ],
      "thumbnail": [
        "https://m.media-amazon.com/images/M/MV5BMTVkMzljMzUtZmIxMS00YWNlLTlkNDMtYmU0Nzc3MjU3OGUwXkEyXkFqcGdeQXVyODMyODMxNDY@.jpg"
      ],
      "poster_link": "https://i.ytimg.com/vi/Jlnr61dEk3c/hqdefault.jpg",
      "platform": "youtube",
      "WORLDWIDE": 0.0, // it is 'double'
      "createdAt": "2020-08-27T15:00:32.523685"
    }

从api接收的数据是float“WORLDWIDE”：0.0，，Homebarner类将其定义为int

class HomeBanner {
      HomeBanner({
        this.movieId
        ...
      });

  String movieId;
  ****
  int worldwide;
  DateTime createdAt;
  String seriesId;
将int转换为double

是的，其他人回答将int更改为double确实有效。我在这个问题上做了越来越多的工作，并且能够成功地解析数据，实际上修改是在服务类中完成的

import 'package:flutter/material.dart';
import 'package:flutterlivetv/jsonParseforHomeScreen.dart';
import 'dart:convert';

import 'package:http/http.dart' as http;

import 'dart_json_web_token_generator.dart';

class Services {
  static const String url =
      "https://livetvapi.apyhi.com/api/v2/home?pageLocation=home&countries=IN&app_version=13&"
      "user_id=44edc2c905ae163f&package_id=livetv.movies.freemovies.watchtv.tvshows&os_platform=android";



  static Future<List<String>> loadDataForMovieId() async {
    var res = await http
        .get(url, headers: {'Authorization': dartJsonWebTokenGenerator()});

    if (res.statusCode == 200) {
      print("response is there");
      final homePage = homePageFromJson(res.body);
      print("homeBannerlist is there");
      //print("homeBannerlist is there");

       // print (homePage.homeBanners);
        HomeBanner homeBannerObject=new HomeBanner();
        List<String> homeBannerObjectMovieIdList=[];
        for(homeBannerObject in homePage.homeBanners)  homeBannerObjectMovieIdList.add(homeBannerObject.movieId);
        print("Movie ID list is there");

        print (homeBannerObjectMovieIdList);
        return homeBannerObjectMovieIdList;


    } else {
      print("no response");
      return null;
    }
  }
}
这是一个与图像相关的代码：

FadeInImage.assetNetwork(
                image:
                    'https://img.youtube.com/vi/${_homeBannerObjectMovieIdList[index].substring(8)}/0.jpg',
                placeholder: cupertinoActivityIndicator,
                fit: BoxFit.fill,
              );
希望这能有所帮助。基本上，它是将每一级向下，并将内容作为list.UFFF..

height==null？空：高度
无效。它应该正好是高度。将
WORLDWIDE
的数据类型从
int
更改为
double
是的，现在错误消失了。我得到一个错误，未处理的异常：类型“HomePage”不是我尝试的类型转换列表中类型“List”的子类型homeBannerlist=homePageFromJson（res.body）…但我真的不知道该怎么办？我想这应该是另一个问题（当然是解析
json
的方式的问题）。如果答案解决了你原来的问题，你可以接受。 
class HomeBanner {
      HomeBanner({
        this.movieId
        ...
      });

  String movieId;
  ****
  int worldwide;
  DateTime createdAt;
  String seriesId;

import 'package:flutter/material.dart';
import 'package:flutterlivetv/jsonParseforHomeScreen.dart';
import 'dart:convert';

import 'package:http/http.dart' as http;

import 'dart_json_web_token_generator.dart';

class Services {
  static const String url =
      "https://livetvapi.apyhi.com/api/v2/home?pageLocation=home&countries=IN&app_version=13&"
      "user_id=44edc2c905ae163f&package_id=livetv.movies.freemovies.watchtv.tvshows&os_platform=android";



  static Future<List<String>> loadDataForMovieId() async {
    var res = await http
        .get(url, headers: {'Authorization': dartJsonWebTokenGenerator()});

    if (res.statusCode == 200) {
      print("response is there");
      final homePage = homePageFromJson(res.body);
      print("homeBannerlist is there");
      //print("homeBannerlist is there");

       // print (homePage.homeBanners);
        HomeBanner homeBannerObject=new HomeBanner();
        List<String> homeBannerObjectMovieIdList=[];
        for(homeBannerObject in homePage.homeBanners)  homeBannerObjectMovieIdList.add(homeBannerObject.movieId);
        print("Movie ID list is there");

        print (homeBannerObjectMovieIdList);
        return homeBannerObjectMovieIdList;


    } else {
      print("no response");
      return null;
    }
  }
}

  List<String> _homeBannerObjectMovieIdList = [];

@override
  void initState() {
    // TODO: implement initState
    super.initState();
    handleScroll(); // function which is responsible for updating the isScrollingDown variable whenever the user scrolls down

    Services.loadDataForMovieId().then((movieIdList) {
      setState(() {
        _homeBannerObjectMovieIdList = movieIdList;
      });
    });

  }

FadeInImage.assetNetwork(
                image:
                    'https://img.youtube.com/vi/${_homeBannerObjectMovieIdList[index].substring(8)}/0.jpg',
                placeholder: cupertinoActivityIndicator,
                fit: BoxFit.fill,
              );