我一直在尝试this中的一些代码
我正在尝试从本地JSON加载数据，此JSON是嵌套模型，这是JSON。
list.json ：
this这是我的 list_model.dart ：
{
"response": "200",
"categorylist": [
{
"categoryId": 1,
"categoryTitle": "Working",
"categoryPost": [
{
"postId": 1,
"postTitle": "Some Working Title",
"reference": "Some Working Reference",
"postContent": [
{
"contentId": 1,
"author": "Some Author Name 1",
"content": "Some long content long content long content 1",
"note": "Some notes 1",
"explanation": "Some Explanation 1"
},
{
"contentId": 2,
"author": "Some Author Name 2",
"content": "Some long content long content long content 2",
"note": "Some notes 2",
"explanation": "Some Explanation 2"
}
]
},
{
"postId": 2,
"postTitle": "Some Title 2",
"reference": "Some reference 2",
"postContent": [
{
"contentId": 1,
"author": "Some Author Name 1",
"content": "Some long content long content long content 1",
"note": "Some notes 1",
"explanation": "Some Explanation 1"
},
{
"contentId": 2,
"author": "Some Author Name 2",
"content": "Some long content long content long content 2",
"note": "Some notes 2",
"explanation": "Some Explanation 2"
}
]
}
]
},
{
"categoryId": 2,
"categoryTitle": "Order",
"categoryPost": [
{
"postId": 1,
"postTitle": "Some Order Title",
"reference": "Some Order Reference",
"postContent": [
{
"contentId": 1,
"author": "Some Author Name 1",
"content": "Some long content long content long content 1",
"note": "Some notes 1",
"explanation": "Some Explanation 1"
},
{
"contentId": 2,
"author": "Some Author Name 2",
"content": "Some long content long content long content 2",
"note": "Some notes 2",
"explanation": "Some Explanation 2"
}
]
},
{
"postId": 2,
"postTitle": "Some Title 2",
"reference": "Some reference 2",
"postContent": [
{
"contentId": 1,
"author": "Some Author Name 1",
"content": "Some long content long content long content 1",
"note": "Some notes 1",
"explanation": "Some Explanation 1"
},
{
"contentId": 2,
"author": "Some Author Name 2",
"content": "Some long content long content long content 2",
"note": "Some notes 2",
"explanation": "Some Explanation 2"
}
]
}
]
}
]
}
这是我的 view_list.dart ：
class Category {
String response;
List<Categorylist> categorylist;
Category({this.response, this.categorylist});
Category.fromJson(Map<String, dynamic> json) {
response = json['response'];
if (json['categorylist'] != null) {
categorylist = new List<Categorylist>();
json['categorylist'].forEach((v) {
categorylist.add(new Categorylist.fromJson(v));
});
}
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['response'] = this.response;
if (this.categorylist != null) {
data['categorylist'] = this.categorylist.map((v) => v.toJson()).toList();
}
return data;
}
}
class Categorylist {
int categoryId;
String categoryTitle;
List<CategoryPost> categoryPost;
Categorylist({this.categoryId, this.categoryTitle, this.categoryPost});
Categorylist.fromJson(Map<String, dynamic> json) {
categoryId = json['categoryId'];
categoryTitle = json['categoryTitle'];
if (json['categoryPost'] != null) {
categoryPost = new List<CategoryPost>();
json['categoryPost'].forEach((v) {
categoryPost.add(new CategoryPost.fromJson(v));
});
}
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['categoryId'] = this.categoryId;
data['categoryTitle'] = this.categoryTitle;
if (this.categoryPost != null) {
data['categoryPost'] = this.categoryPost.map((v) => v.toJson()).toList();
}
return data;
}
}
class CategoryPost {
int postId;
String postTitle;
String reference;
List<PostContent> postContent;
CategoryPost({this.postId, this.postTitle, this.reference, this.postContent});
CategoryPost.fromJson(Map<String, dynamic> json) {
postId = json['postId'];
postTitle = json['postTitle'];
reference = json['reference'];
if (json['postContent'] != null) {
postContent = new List<PostContent>();
json['postContent'].forEach((v) {
postContent.add(new PostContent.fromJson(v));
});
}
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['postId'] = this.postId;
data['postTitle'] = this.postTitle;
data['reference'] = this.reference;
if (this.postContent != null) {
data['postContent'] = this.postContent.map((v) => v.toJson()).toList();
}
return data;
}
}
class PostContent {
int contentId;
String author;
String content;
String note;
String explanation;
PostContent(
{this.contentId, this.author, this.content, this.note, this.explanation});
PostContent.fromJson(Map<String, dynamic> json) {
contentId = json['contentId'];
author = json['author'];
content = json['content'];
note = json['note'];
explanation = json['explanation'];
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['contentId'] = this.contentId;
data['author'] = this.author;
data['content'] = this.content;
data['note'] = this.note;
data['explanation'] = this.explanation;
return data;
}
}
我无法将类别列表中的JSON数据加载到listview.builder中。
在上面的视图代码中，我只想列出json中的所有“ categoryTitle”，并在详细信息页面上进行点按操作。该怎么做？
答案 0 :(得分：0)
我已经解决了这个问题，在小部件中将这段代码写入listviewBuilder中：
Widget futureWidget() {
return new FutureBuilder(
future: loadCategory(),
builder: (context, snapshot) {
if (snapshot.hasData) {
return new Container(
child: Row(
children: <Widget>[
ListView.builder(
itemBuilder: (BuildContext context, index) {
return Column(
children: <Widget>[
InkWell(
onTap: () {},
child: Text(
snapshot.data.category.categorylist[index].categoryTitle,
),
)
],
);
}
)
],
),
);
}
},
);
}
然后在下面添加以下代码以加载嵌套的json：
Future<String> _loadCategoryfromAssets() async {
return await rootBundle.loadString('assets/data/list.json');
}
Future loadCategory() async {
await wait(1);
String jsonString = await _loadCategoryfromAssets();
final jsonResponse = json.decode(jsonString);
Category category = Category.fromJson(jsonResponse);
print(category.categorylist[0].categoryTitle);
print(category.categorylist[0].categoryPost[0].postTitle);
}
Future wait(int seconds) {
return new Future.delayed(Duration(seconds: seconds), () => {});
}