我对 JSON 数据进行了以下建模，其中每个订单中都有订单和商品。
数据模型
class NewOrder {
String _error;
List<Content> _content;
NewOrder({String error, List<Content> content}) {
this._error = error;
this._content = content;
}
String get error => _error;
set error(String error) => _error = error;
List<Content> get content => _content;
set content(List<Content> content) => _content = content;
NewOrder.fromJson(Map<String, dynamic> json) {
_error = json['error'];
if (json['content'] != null) {
_content = new List<Content>();
json['content'].forEach((v) {
_content.add(new Content.fromJson(v));
});
}
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['error'] = this._error;
if (this._content != null) {
data['content'] = this._content.map((v) => v.toJson()).toList();
}
return data;
}
}
class Content {
String _orderNo;
List<OrderItems> _orderItems;
Content(
{
String orderNo,
List<OrderItems> orderItems}) {
this._orderNo = orderNo;
this._orderItems = orderItems;
}
set orderNo(String orderNo) => _orderNo = orderNo;
List<OrderItems> get orderItems => _orderItems;
set orderItems(List<OrderItems> orderItems) => _orderItems = orderItems;
Content.fromJson(Map<String, dynamic> json) {
_orderNo = json['order_no'];
if (json['order_items'] != null) {
_orderItems = new List<OrderItems>();
json['order_items'].forEach((v) {
_orderItems.add(new OrderItems.fromJson(v));
});
}
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['order_no'] = this._orderNo;
if (this._orderItems != null) {
data['order_items'] = this._orderItems.map((v) => v.toJson()).toList();
}
return data;
}
}
class OrderItems {
String _compCode;
OrderItems({String compCode, String compName, String orderNo}) {
this._compCode = compCode;
}
String get compCode => _compCode;
set compCode(String compCode) => _compCode = compCode;
OrderItems.fromJson(Map<String, dynamic> json) {
_compCode = json['comp_code'];
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['comp_code'] = this._compCode;
return data;
}
}
JSON数据
{
"error": "false",
"content": [
{
"order_no": "16",
"order_items": [
{
"comp_code": "4",
},
{
"comp_code": “5”,
}
]
},
{
"order_no": "18",
"order_items": [
{
"comp_code": “9”,
},
{
"comp_code": “11”,
},
{
"comp_code": “7”,
},
]
}
]
}
我需要在 PageView.builder(Horizontal Scroll) 和嵌套的 ListView.builder(Vertical Scroll) 中显示数据，这个模型我已经创建了。
我使用以下代码将 JSON 日期与上述配置的模型相关联，并且此功能成功运行
Future<NewOrder> getdetailsoforders(String userid, String companycode) async {
SharedPreferences sharedPreferences = await SharedPreferences.getInstance();
Map data = {
'user_id': userid,
'company_code':companycode
};
var response = await http.post(newapi, body: data);
if(response.statusCode == 200) {
jsonResponse = json.decode(response.body);
return NewOrder.fromJson(jsonResponse);
}
}
现在我需要将 JSON 数据字段关联到我使用以下小部件的小部件模型
FutureBuilder(
future: _future,
builder: (context, AsyncSnapshot<Payload> snapshot) {
switch (snapshot.connectionState) {
case ConnectionState.none:
return Text('none');
case ConnectionState.waiting:
return Center(child: CircularProgressIndicator());
case ConnectionState.active:
return Text('');
case ConnectionState.done:
if (snapshot.hasError) {
return Text(
'${snapshot.error}',
style: TextStyle(color: Colors.red),
);
} else {
return PageView.builder(
scrollDirection: Axis.horizontal,
itemCount: snapshot.data.content.length,// length of total orders
itemBuilder: (context, index) {
return Column(
children:<Widget>[
Text('Order Number to be Displayed here'),
ListView.builder(
shrinkWrap: true,
itemCount: //lenght of the items in the order to be determined,
itemBuilder: (context, index) {
return Column(
children: [
Text('Item Name'),
Text('Item description here')
],
);
},
),
])
});
}
}
})
对于订单的最终清单及其各自的项目，我需要从模型中获取字段，但我无法这样做，请指导我如何获取这些详细信息。我需要Order NO.来自内容模型的 ，然后在同一个模型中，我需要获取 的长度，order_items然后是这些订单项的字段值。
我是学习 JSON Flutter 的新手，这就是我面临这个问题的原因，请指导我解决方案。
我知道我写了很多代码，但它是为了提供一个清晰的画面，究竟需要做什么。