我想从listofTaskNotApprove类更新图像，它将把documentsnapshot的对象传递到EditTaskNotApprove中。在更新图像之前，我需要显示特定于图像的图像，在该图像中，用户将从listofTaskNotApprove中选择特定信息。问题是如何在新屏幕中显示图像的当前索引？
ListOfTaskNotAccepted类。
import 'package:carousel_pro/carousel_pro.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:fyp/screen/RecordOfficer/EditTaskNotApprove.dart';
import 'package:fyp/shared/Loading.dart';
import 'package:google_fonts/google_fonts.dart';
class ListOfTaskNotAccepted extends StatefulWidget {
@override
_ListOfTaskNotAcceptedState createState() => _ListOfTaskNotAcceptedState();
}
final FirebaseAuth auth = FirebaseAuth.instance;
Stream<QuerySnapshot> getUser(BuildContext context) async* {
final FirebaseUser rd = await auth.currentUser();
yield* Firestore.instance.collection("Task").where('uid',isEqualTo: rd.uid).where("verified", isEqualTo: 'TidakSah').snapshots();
}
class _ListOfTaskNotAcceptedState extends State<ListOfTaskNotAccepted> {
List<NetworkImage> _listOfImages = <NetworkImage>[];
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Aduan Tidak Diterima"),
backgroundColor: Colors.redAccent,
),
body: Container(
child: StreamBuilder(
stream: getUser(context),
builder: (context, snapshot){
if (snapshot.hasError || !snapshot.hasData) {
return Loading();
} else{
return ListView.builder(
itemCount: snapshot.data.documents.length,
itemBuilder: (BuildContext context, int index){
DocumentSnapshot da = snapshot.data.documents[index];
_listOfImages =[];
for(int i =0; i <da['url'].length; i++){
_listOfImages.add(NetworkImage(da['url'][i]));
}
return Card(
child:ListTile(
title: Container(
alignment: Alignment.centerLeft,
child: Column(
children: <Widget>[
SizedBox(height: 5.0),
Container(alignment: Alignment.centerLeft,
child: Row(
children: [
Text("Sumber Aduan: ", style: GoogleFonts.asap(fontWeight: FontWeight.bold)),
Text(da['sumberAduan'], style: GoogleFonts.asap(fontWeight: FontWeight.bold)),
],
),
),
SizedBox(height: 5.0),
Container(alignment: Alignment.centerLeft,
child: Row(
children: [
Text("Nombor Aduan: ", style: GoogleFonts.lato(fontWeight: FontWeight.bold)),
Text(da['noAduan'], style: GoogleFonts.lato(fontWeight: FontWeight.bold)),
],
),
),
SizedBox(height: 5.0),
Container(alignment: Alignment.centerLeft,
child: Row(
children: [
Text("Lokasi: ", style: GoogleFonts.lato(fontWeight: FontWeight.bold)),
Text(da['kawasan'] + " " + da['naJalan'], style: GoogleFonts.lato(fontWeight: FontWeight.bold)),
],
),
),
SizedBox(height: 5.0),
Container(alignment: Alignment.centerLeft,
child: Row(
children: [
Text("Kategori: ", style: GoogleFonts.arimo(fontWeight: FontWeight.w500)),
Text(da['kategori'], style: GoogleFonts.arimo(fontWeight: FontWeight.w500)),
],
),
),
Column(
children: [
Container(
margin: EdgeInsets.all(10.0),
height: 200,
decoration: BoxDecoration(
color: Colors.white
),
width: MediaQuery.of(context).size.width,
child: Carousel(
boxFit: BoxFit.cover,
images: _listOfImages,
autoplay: false,
indicatorBgPadding: 5.0,
dotPosition: DotPosition.bottomCenter,
animationCurve: Curves.fastLinearToSlowEaseIn,
animationDuration: Duration(milliseconds: 2000),
),
)
],
)
],
),
),
subtitle: Container(
child: Column(
children: [
SizedBox(height: 5.0),
Container(alignment: Alignment.centerLeft,
child: Row(
children: [
Text("Catatan: ", style: GoogleFonts.arimo(fontWeight: FontWeight.w500)),
Text(da['comments'], style: GoogleFonts.arimo(fontWeight: FontWeight.w500)),
],
),
),
],
),
),
onTap: () {Navigator.push(context, MaterialPageRoute(builder: (context) => EditTask(da:da)));}
)
);
});
}
}),
)
);
}
}
这是EditTask类，我需要显示用户选择的图像的当前索引。
import 'package:carousel_pro/carousel_pro.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
class EditTask extends StatefulWidget {
final DocumentSnapshot da;
const EditTask({Key key, this.da}) : super(key: key);
@override
_EditTaskState createState() => _EditTaskState(da);
}
class _EditTaskState extends State<EditTask> {
DocumentSnapshot da;
_EditTaskState(DocumentSnapshot da){
this.da = da;
}
TextEditingController _noAduan;
TextEditingController _sumberAduan;
TextEditingController _kategori;
DateTime myDateTime = DateTime.now();
@override
void initState(){
super.initState();
_noAduan = TextEditingController(text: widget.da.data['noAduan']);
_sumberAduan =TextEditingController(text: widget.da.data['sumberAduan']);
_kategori = TextEditingController(text: widget.da.data['kategori']);
myDateTime = (da.data['date']).toDate();
_listOfImages = NetworkImage(da.data['url']) as List<NetworkImage>; // this line show the error
}
List <String> sumber = <String> ['Sistem Aduan MBPJ', 'Sistem Aduan Waze', 'Sistem Aduan Utiliti'];
List <String> kate = <String> ['Segera', 'Pembaikan Biasa'];
String kategori;
String sumberAduan;
List <NetworkImage> _listOfImages = <NetworkImage>[];
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Kemaskini Aduan"),
backgroundColor: Colors.redAccent,
),
body: Container(
padding: const EdgeInsets.all(16.0),
child: Center(
child: Column(
crossAxisAlignment: CrossAxisAlignment.end,
children: [
SizedBox(height: 10.0),
TextFormField(
decoration:InputDecoration(
hintText: myDateTime.toString(),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(5))),
onChanged: (value){
setState(() {
myDateTime = value as DateTime;
print(myDateTime);
});
},
),
SizedBox(height: 10.0),
TextFormField(
decoration:InputDecoration(
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(5))),
controller: _noAduan,
),
SizedBox(height: 10.0),
DropdownButtonFormField(
hint:Text(widget.da.data['sumberAduan']),
decoration: InputDecoration(
prefixIcon: Icon(Icons.perm_contact_calendar),
border: OutlineInputBorder(borderRadius: BorderRadius.circular(5))),
isExpanded: true,
value: sumberAduan,
onChanged: (newValue) {
setState(() {
sumberAduan = newValue;
_sumberAduan.text = sumberAduan;
});
},
items: sumber.map((sum){
return DropdownMenuItem(
value: sum,
child: new Text(sum),
);
}).toList(),
),
SizedBox(height: 10.0),
DropdownButtonFormField(
hint:Text(widget.da.data['kategori']),
decoration: InputDecoration(
prefixIcon: Icon(Icons.perm_contact_calendar),
border: OutlineInputBorder(borderRadius: BorderRadius.circular(5))),
isExpanded: true,
value: kategori,
onChanged: (newValue) {
setState(() {
kategori = newValue;
_kategori.text = kategori;
});
},
items: kate.map((ka){
return DropdownMenuItem(
value: ka,
child: new Text(ka),
);
}).toList(),
),
Container(
margin: EdgeInsets.all(10.0),
height: 200,
decoration: BoxDecoration(
color: Colors.white
),
width: MediaQuery.of(context).size.width,
child: Carousel(
boxFit: BoxFit.cover,
autoplay: false,
//images: _listOfImages,
indicatorBgPadding: 5.0,
dotPosition: DotPosition.bottomCenter,
animationCurve: Curves.fastLinearToSlowEaseIn,
animationDuration: Duration(milliseconds: 2000),
),
)
],
),
),
)
);
}
}
需要显示以更新图像的图像
这是当用户要从ListOfTaskNotApprove更新信息时要在类EditTask中显示图像的方式
错误显示“类型'列表'不是类型'字符串'的子类型”有人可以帮我吗？因为我尝试了很多方法来解决此问题，但对我而言不起作用。
它仍然没有为我工作。=（。仍然会出现相同的错误
您添加了
[和]，NetworkImage(da.data['url'])并且出现了相同的错误？很难相信，错误肯定会有所不同，即使那并不能解决问题。我已经将[]放在NetworkImage（da.data ['url']）周围，如果我将您建议的演员表NetworkImage放到了黄线，则表示“不必要的演员转换”。我试图将其删除并得到相同的错误。😥
哦，du！更改：
_listOfImages = NetworkImage(da.data['url']) as List<NetworkImage>;只是_listOfImages.add(NetworkImage(da.data['url']));我已经用过了。仍然会出现相同的错误。=（