下面是我的模型课：
crm_dependent_list_model.dart（模型类）
import 'crm_dep_entitlement_model.dart';
class DependantModel{
String name;
String relationship;
EntitlementsModel entitlements;
DependantModel({this.name, this.relationship, this.entitlements});
factory DependantModel.fromJson(Map depjson){
return DependantModel(
name: depjson["Name"].toString(),
relationship: depjson["Relationship"].toString(),
entitlements: EntitlementsModel.fromJson(depjson["Entitlements"])
);
}
}
这是 DependantModel类
中的 EntitlementsModelcrm_dep_entitlement_model.dart
class EntitlementsModel{
final GP gp;
final OPS ops;
final IP ip;
final Dental dental;
final Optical optical;
final EHS ehs;
EntitlementsModel({this.gp, this.ops, this.ip, this.dental, this.optical, this.ehs});
factory EntitlementsModel.fromJson(Map ejson){
return EntitlementsModel(
gp: GP.fromJson(ejson["GP"]),
ops: OPS.fromJson(ejson["OPS"]),
ip: IP.fromJson(ejson["IP"]),
dental: Dental.fromJson(ejson["Dental"]),
optical: Optical.fromJson(ejson["Optical"]),
ehs: EHS.fromJson(ejson["EHS"])
);
}
}
//GP class
class GP{
final String entitlement, utilisation, balance;
GP({this.entitlement, this.utilisation, this.balance});
factory GP.fromJson(Map gjson){
return GP(
entitlement: gjson["Entitlement"].toString(),
utilisation: gjson["Utilisation"].toString(),
balance: gjson["Balance"].toString()
);
}
}
//OPS class
class OPS{
final String entitlement, utilisation, balance;
OPS({this.entitlement, this.utilisation, this.balance});
factory OPS.fromJson(Map gjson){
return OPS(
entitlement: gjson["Entitlement"].toString(),
utilisation: gjson["Utilisation"].toString(),
balance: gjson["Balance"].toString()
);
}
}
//IP class
class IP{
final String entitlement, utilisation, balance;
IP({this.entitlement, this.utilisation, this.balance});
factory IP.fromJson(Map gjson){
return IP(
entitlement: gjson["Entitlement"].toString(),
utilisation: gjson["Utilisation"].toString(),
balance: gjson["Balance"].toString()
);
}
}
//Dental class
class Dental{
final String entitlement, utilisation, balance;
Dental({this.entitlement, this.utilisation, this.balance});
factory Dental.fromJson(Map gjson){
return Dental(
entitlement: gjson["Entitlement"].toString(),
utilisation: gjson["Utilisation"].toString(),
balance: gjson["Balance"].toString()
);
}
}
//Optical class
class Optical{
final String entitlement, utilisation, balance;
Optical({this.entitlement, this.utilisation, this.balance});
factory Optical.fromJson(Map gjson){
return Optical(
entitlement: gjson["Entitlement"].toString(),
utilisation: gjson["Utilisation"].toString(),
balance: gjson["Balance"].toString()
);
}
}
//EHS class
class EHS{
final String entitlement, utilisation, balance;
EHS({this.entitlement, this.utilisation, this.balance});
factory EHS.fromJson(Map gjson){
return EHS(
entitlement: gjson["Entitlement"].toString(),
utilisation: gjson["Utilisation"].toString(),
balance: gjson["Balance"].toString()
);
}
}
当前使用该模型类从此类中的JSON中提取数据：
Fifth.dart（调用JSON数据的类）
import 'package:flutter/material.dart';
import 'package:emas_app/Dependant.dart' as Dep;
import 'model/crm_dependent_list_model.dart';
import 'dart:convert';
import 'dart:async';
import 'package:http/http.dart' as http;
final String url = "http://crm.emastpa.com.my/MemberInfo.json";
//Future to get list of dependent names
Future<List<DependantModel>> fetchUserInfo() async{
http.Response response = await http.get(url);
var responsejson = json.decode(response.body);
return(responsejson[0]['Dependents'] as List)
.map((user) => DependantModel.fromJson(user))
.toList();
}
class Fifth extends StatefulWidget {
@override
_FifthState createState() => _FifthState();
}
class _FifthState extends State<Fifth> {
static Future<List<DependantModel>> depState;
@override
void initState() {
depState = fetchUserInfo();
super.initState();
}
@override
Widget build(BuildContext context) {
//ListView.builder inside FutureBuilder
var futureBuilder = new FutureBuilder(
future: depState,
builder: (context, snapshot){
switch(snapshot.connectionState){
case ConnectionState.none:
case ConnectionState.waiting:
return new Center(
child: new CircularProgressIndicator(),
);
default:
if(snapshot.hasError){
return new Text(snapshot.error);
}else{
List<DependantModel> user = snapshot.data;
return new ListView.builder(
itemCount: user.length,
itemBuilder: (context, index){
return new Column(
children: <Widget>[
new ListTile(
title: new Text(user[index].name,
style: TextStyle(fontSize: 20.0)),
subtitle: new Text(user[index].relationship,
style: TextStyle(fontSize: 15.0)),
trailing: new MaterialButton(color: Colors.greenAccent,
textColor: Colors.white,
child: new Text("More"),
onPressed: (){
Navigator.push(context,
new MaterialPageRoute(builder: (context) => Dep.Dependents(name: user[index].name, entitlementsModel: user[index].entitlements))
);
}
),
)
],
);
});
}
}
});
return new Scaffold(
body: futureBuilder,
);
}
}
Fifth.dart 类将通过此类中的构造函数发送数据：
Dependent.dart（带有构造函数的类）
import 'model/crm_dep_entitlement_model.dart';
import 'package:flutter/material.dart';
import 'dart:convert';
import 'dart:async';
import 'package:http/http.dart' as http;
import 'model/crm_dependent_list_model.dart';
import 'package:flutter/foundation.dart';
final String url = "http://crm.emastpa.com.my/MemberInfo.json";
//Future method to fetch information
Future<EntitlementsModel> fetchEntitlements() async{
final response = await http.get(url);
final jsonresponse = json.decode(response.body);
var res = jsonresponse[0]["Dependents"][0]["Entitlements"];
return EntitlementsModel.fromJson(jsonresponse[0]["Dependents"][0]["Entitlements"]);
}
//void main() => runApp(Dependents());
class Dependents extends StatefulWidget {
final String name;
// final Map entitlement;
final EntitlementsModel entitlementsModel;
//Constructor to accept the value from Fifth.dart
// Dependents({Key key, this.name, this.dependantModel) : super(key: key);
Dependents({Key key, this.name, this.entitlementsModel}) : super(key:key);
@override
_DependentsState createState() => _DependentsState();
}
class _DependentsState extends State<Dependents> {
Future<EntitlementsModel> entitlement;
@override
void initState() {
entitlement = fetchEntitlements();
super.initState();
}
@override
Widget build(BuildContext context) {
//new body widget
Widget body = new Container(
child: new Center(
child: new FutureBuilder(
future: entitlement,
builder: (context, snapshot){
if(snapshot.hasData){
var entitledata = snapshot.data;
//retrieve data from snapshot
var gpentitlement = entitledata.gp.entitlement;
var gputilisation = entitledata.gp.utilisation;
var gpbalance = entitledata.gp.balance;
var opsentitle = entitledata.ip.entitlement;
var opsutilisation = entitledata.ip.utilisation;
var opsbalance = entitledata.ip.balance;
return new Column(
children: <Widget>[
new ListTile(
title: new Text("Name: "),
subtitle: new Text("${widget.name}"),
) ,
new Divider(
color: Colors.black,
),
new ListTile(
title: new Text("Clinic GP",
style: TextStyle(
fontWeight: FontWeight.bold,
),
),
) ,
new ListTile(
title: new Text("Entitlement"),
trailing: new Text(gpentitlement),
),
new ListTile(
title: new Text("Utilisation"),
trailing: new Text(gputilisation),
),
new ListTile(
title: new Text("Balance"),
trailing: new Text(gpbalance),
),
new Divider(
color: Colors.black,
),
new ListTile(
title: new Text("IP",
style: TextStyle(
fontWeight: FontWeight.bold,
),
),
),
new ListTile(
title: new Text("Entitlement"),
trailing: new Text(opsentitle),
),
new ListTile(
title: new Text("Utilisation"),
trailing: new Text(opsutilisation),
),
new ListTile(
title: new Text("Balance"),
trailing: new Text(opsbalance),
),
],
);
}else if(snapshot.hasError){
return new Text(snapshot.error);
}
//loading the page
return new Center(
child: new CircularProgressIndicator(),
);
}),
),
);
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('${widget.name}'),
),
body: body
),
);
}
}
这是我遇到的错误：
compiler message: lib/Fifth.dart:72:155: Error: The argument type '#lib1::EntitlementsModel' can't be assigned to the parameter type '#lib2::EntitlementsModel'.
compiler message: Try changing the type of the parameter, or casting the argument to '#lib2::EntitlementsModel'.
compiler message: new MaterialPageRoute(builder: (context) => Dep.Dependents(name: user[index].name, entitlementsModel: user[index].entitlements))
compiler message:
还有：
I/flutter ( 6816): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter ( 6816): The following assertion was thrown building FutureBuilder<List<DependantModel>>(dirty, state:
I/flutter ( 6816): _FutureBuilderState<List<DependantModel>>#bdb2c):
I/flutter ( 6816): type 'NoSuchMethodError' is not a subtype of type 'String'
我的问题是：
我如何解决该错误，因为它说我应该强制转换该参数，但我不知道如何解决，因为 EntitlementsModel 是一个包含多个Maps类的类。
答案 0 :(得分：2)
似乎EntitlementsModel的导入冲突。尝试将所有导入内容重写为以下形式：
import 'package:YOUR_PACKAGE/../...dart'
“ YOUR_PACKAGE”应为pubspec.yml name变量中所述的应用程序名称。
该目录将构成从lib文件夹（不包括该文件夹）到导入的dart文件的所有文件夹。
（您在Fifth.dart文件的第二行中使用此导入方案）