我正在制作一个Flutter 应用程序,我正在使用MovieDB api获取数据.当我调用api并要求特定电影时,我得到的是一般格式:
{
"adult": false,
"backdrop_path": "/wrqUiMXttHE4UBFMhLHlN601MZh.jpg",
"belongs_to_collection": null,
"budget": 120000000,
"genres": [
{
"id": 28,
"name": "Action"
},
{
"id": 12,
"name": "Adventure"
},
{
"id": 878,
"name": "Science Fiction"
}
],
"homepage": "http://www.rampagethemovie.com",
"id": 427641,
"imdb_id": "tt2231461",
"original_language": "en",
"original_title": "Rampage",
...
}
我已经为它设置了一个模型类来解析它,该类的定义如下:
import 'dart:async';
class MovieDetail {
final String title;
final double rating;
final String posterArtUrl;
final backgroundArtUrl;
final List<Genre> genres;
final String overview;
final String tagline;
final int id;
const MovieDetail(
{this.title, this.rating, this.posterArtUrl, this.backgroundArtUrl, this.genres, this.overview, this.tagline, this.id});
MovieDetail.fromJson(Map jsonMap)
: title = jsonMap['title'],
rating = jsonMap['vote_average'].toDouble(),
posterArtUrl = "http://image.tmdb.org/t/p/w342" + jsonMap['backdrop_path'],
backgroundArtUrl = "http://image.tmdb.org/t/p/w500" + jsonMap['poster_path'],
genres = (jsonMap['genres']).map((i) => Genre.fromJson(i)).toList(),
overview = jsonMap['overview'],
tagline = jsonMap['tagline'],
id = jsonMap['id'];
}
class Genre {
final int id;
final String genre;
const Genre(this.id, this.genre);
Genre.fromJson(Map jsonMap)
: id = jsonMap['id'],
genre = jsonMap['name'];
}
我的问题是我无法从JSON中正确解析该类型.当我获取JSON并通过我的模型类传递它时,我得到以下错误:
I/flutter (10874): type 'List<dynamic>' is not a subtype of type 'List<Genre>' where
I/flutter (10874): List is from dart:core
I/flutter (10874): List is from dart:core
I/flutter (10874): Genre is from package:flutter_app_first/models/movieDetail.dart
我认为这会起作用,因为我为Genre
对象创建了一个不同的类,并将JSON数组作为列表传递.我不明白为什么List<dynamic>
不是List<Genre>
岁的子元素,因为关键字dynamic
不意味着any对象吗?有人知道如何将嵌套的JSON数组解析为自定义对象吗?