如何解决在flutter中为JSON数据配置字段时遇到错误
我在flutter应用程序中获取了JSON数据，我试图将其显示为PageView.builder和嵌套的ListView.builder，这是我已经创建的模型。
首先像这样配置JSON数据订单详细信息，然后它具有嵌套的order_items。我需要在一页中显示单个订单，然后在ListView.Builder中的同一页面上显示order_items。
在这种尝试中，我遇到了以下错误
错误
TypeList<dynamic> is not a subtype of Map<dynamic,dynamic>
我无法为pageview的元素编制索引，而为order_items嵌套的ListView.builder编制索引。
请指导我如何纠正它
这是我可以在flutter应用程序中从服务器获取的JSON数据
{
"error": "false","content": [
{
"comp_code": "4","comp_name": "KMT OVERSEAS","order_no": "16","soh_pk": "23660","order_items": [
{
"comp_code": "4","sod_pk": "31689",},{
"comp_code": "4","sod_pk": "31688",}
]
},{
"comp_code": "4","order_no": "18","soh_pk": "23702","sod_pk": "31749","sod_pk": "31742","sod_pk": "31743",]
}
]
}
我使用的代码是用于获取有状态小部件中数据的
Future<Payload> getdetailsoforders(String userid,String companycode) async {
SharedPreferences sharedPreferences = await SharedPreferences.getInstance();
Map data = {
'user_id': userid,'company_code':companycode
};
//newapi is the url link for the server
var response = await http.post(newapi,body: data);
if(response.statusCode == 200) {
jsonResponse = json.decode(response.body);
print("jsonrespnse");
print(jsonResponse);
}
}
这是我用来获取字段数据的代码
NewDetail.fromJson(Map<String,dynamic> json) {
error = json['error'];
if (json['content'] != null) {
content = new List<NewOrderModel>();
json['content'].forEach((v) {
content.add(new NewOrderModel.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;
}
在flutter应用程序中正在实现的小工具代码
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.keys.length, itemBuilder: (context,index) {
String key =
snapshot.data.content.keys.elementAt(index);
return Column(
children: [
SizedBox(height: 25,), Column(
mainAxisAlignment: MainAxisAlignment.center, crossAxisAlignment:CrossAxisAlignment.center, children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.center, crossAxisAlignment:CrossAxisAlignment.center, children: <Widget>[
Container(
height: 32, width: 160, decoration: BoxDecoration(
color: Colors.white, border: Border.all(
width:0.5, color: Color(0xFF766F6F), ), borderRadius: BorderRadius.circular(10.0), ), child: Center(
child: Text('Order No.',style: TextStyle(backgroundColor: Colors.white, color:Color(0xFF2e2a2a), fontFamily: 'Roboto', fontSize: 12, ), Container(
height: 32, border: Border.all(
width:0.5, child: Center(
child: Text(key, )]
, ], SizedBox(height: 30, Expanded(
child: ListView.separated(
separatorBuilder:
(BuildContext context,int index) {
return SizedBox(
height: 16, );
}, shrinkWrap: true, itemCount: snapshot.data.content[key].length, itemBuilder: (context,index) {
return Column(
children: [
Column(
mainAxisAlignment: MainAxisAlignment.center, crossAxisAlignment: CrossAxisAlignment.center, children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.center, // crossAxisAlignment:CrossAxisAlignment.center, children: <Widget>[
Container(
height: 32, width: 160, decoration: BoxDecoration(
color: Colors.white, border: Border.all(
width:0.5, color: Color(0xFF766F6F), ), borderRadius: BorderRadius.circular(10.0), ), child: Center(
child: Text("Catalog Item", style: TextStyle(backgroundColor: Colors.white, color:Color(0xFF2e2a2a), fontFamily: 'Roboto', fontSize: 12, ), Container(
height: 32, child: Center(
child: Text(snapshot
.data.content[key][index][0].sqdFk, ], Row(
mainAxisAlignment: MainAxisAlignment.center, crossAxisAlignment:CrossAxisAlignment.center, border: Border.all(
width:0.5, child: Center(
child: Text('QTY.', child: Center(
child: Text(snapshot
.data.content[key][index][0].sohFk,], ], ), )
], );
});
}
}
})
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