手动json转化之后强制类型转化
{
"rating": {
"max": 10,
"average": 7.4,
"stars": "40",
"min": 0
},
"reviews_count": 301,
"wish_count": 15912,
"douban_site": "",
"year": "2009",
"images": {
"small": "https://img1.doubanio.com/view/photo/s_ratio_poster/public/p494268647.jpg",
"large": "https://img1.doubanio.com/view/photo/s_ratio_poster/public/p494268647.jpg",
"medium": "https://img1.doubanio.com/view/photo/s_ratio_poster/public/p494268647.jpg"
},
"alt": "https://movie.douban.com/subject/1764796/",
"id": "1764796",
"mobile_url": "https://movie.douban.com/subject/1764796/mobile",
"title": "机器人9号",
"do_count": null,
"share_url": "https://m.douban.com/movie/subject/1764796",
"seasons_count": null,
"schedule_url": "",
"episodes_count": null,
"countries": [
"美国"
],
"genres": [
"动画",
"冒险",
"奇幻"
],
"collect_count": 74934,
"casts": [
{
"alt": "https://movie.douban.com/celebrity/1054395/",
"avatars": {
"small": "https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p51597.jpg",
"large": "https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p51597.jpg",
"medium": "https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p51597.jpg"
},
"name": "伊莱贾·伍德",
"id": "1054395"
},
{
"alt": "https://movie.douban.com/celebrity/1016673/",
"avatars": {
"small": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p33305.jpg",
"large": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p33305.jpg",
"medium": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p33305.jpg"
},
"name": "詹妮弗·康纳利",
"id": "1016673"
},
{
"alt": "https://movie.douban.com/celebrity/1017907/",
"avatars": {
"small": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p55994.jpg",
"large": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p55994.jpg",
"medium": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p55994.jpg"
},
"name": "约翰·C·赖利",
"id": "1017907"
},
{
"alt": "https://movie.douban.com/celebrity/1036321/",
"avatars": {
"small": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p42033.jpg",
"large": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p42033.jpg",
"medium": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p42033.jpg"
},
"name": "克里斯托弗·普卢默",
"id": "1036321"
}
],
"current_season": null,
"original_title": "9",
"summary": "机器人9号（伊利亚•伍德 Elijah Wood 饰）突然醒来，发现身边的世界充满危机，四处残败，一片末世景象。9号带着一个画有三个奇怪符号的圆形物体逃到街上，幸遇发明家机器人2号（马丁•兰道 Martin Landau 饰）给自己装上了声音，但2号却不幸被机器怪兽抓走。9号找到了老兵1号（克里斯托弗•普卢默 Christopher Plummer 饰）、机械工5号（约翰•雷利 John C. Reilly 饰）、疯癫画家6号（克里斯品•格拉夫 Crispin Glover 饰）和大力士8号（弗雷德•塔塔绍尔 Fred Tatasciore 饰）。9号与5号擅自出行援救2号，危急时被女武士7号（詹妮佛•康纳利 Jennifer Connelly 饰）救下，但无意中9号却令终极机器兽复活。带着自己从哪里来以及生存使命的问题，9号决定想尽办法制服机器兽，拯救全世界……©豆瓣",
"subtype": "movie",
"directors": [
{
"alt": "https://movie.douban.com/celebrity/1276787/",
"avatars": {
"small": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1351678808.44.jpg",
"large": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1351678808.44.jpg",
"medium": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1351678808.44.jpg"
},
"name": "申·阿克",
"id": "1276787"
}
],
"comments_count": 9193,
"ratings_count": 60293,
"aka": [
"9：末世决战",
"九",
"Number 9",
"机器人9号"
]
}
转化为Map数组
List<Widget> casts = snap.data['casts']
.cast<Map<String, dynamic>>()
.map<Widget>((item) => new Column(
children: <Widget>[
new Image.network(item['avatars']['small']),
new Text(item['name'])
],
))
.toList();
拆解步骤
1. 先进行类型转换
2. 使用map 方法遍历返回Iteration
map<Widget>((item){
return Widget
}) 或者
map<Widget>((item)=> new Widget)
3. 将Iteration转化为List<Widget>
iteraInstance.toList()
转化为List<String>遍历
snap.data['genres'].cast<String>().map<Widget>((item) {
return new Text(
' ${item} ',
style: new TextStyle(
color: Colors.green,
fontWeight: FontWeight.w100,
fontSize: 18.0),
);
}).toList()
步骤同上只是这次转为cast<String>()
