所以，我有麻烦，只有一个收集，另一个工程罚款。我真的不明白我能在这里做什么：
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
class DarhanScreen extends StatefulWidget {
const DarhanScreen({super.key});
@override
State<DarhanScreen> createState() => _DarhanScreenState();
}
class _DarhanScreenState extends State<DarhanScreen> {
int selectedIndex = 0;
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: Scaffold(
body: StreamBuilder<QuerySnapshot>(
stream: FirebaseFirestore.instance.collection('posts').snapshots(),
builder: (context, snapshot) {
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
const Align(
alignment: Alignment.centerRight,
child: Icon(Icons.settings),
),
Row(
children: [
const CircleAvatar(
radius: 30,
),
const SizedBox(
width: 10,
),
RichText(
text: const TextSpan(
text: 'Привет, ',
style: TextStyle(
color: Colors.black,
fontSize: 24,
fontFamily: 'onest'),
children: [
TextSpan(
text: 'Дархан',
style:
TextStyle(fontWeight: FontWeight.bold)),
TextSpan(
text: '\nУдачной учебы!',
style: TextStyle(
fontSize: 8,
color: Color.fromRGBO(164, 172, 183, 1)))
]),
)
],
),
const Padding(
padding: EdgeInsetsDirectional.fromSTEB(20, 0, 0, 15),
child: Align(
alignment: Alignment.centerLeft,
child: Text(
'Мероприятия',
style: TextStyle(
fontSize: 24,
fontFamily: 'onest',
fontWeight: FontWeight.w800),
textAlign: TextAlign.center,
),
),
),
Row(
children: [
GestureDetector(
onTap: () {
setState(() {
selectedIndex = 0;
});
},
child: Text('Сегодня',
style: (selectedIndex == 0)
? const TextStyle(color: Colors.blue)
: const TextStyle(color: Colors.black))),
const SizedBox(
width: 10,
),
GestureDetector(
onTap: () {
setState(() {
selectedIndex = 1;
});
},
child: Text('Планируется',
style: (selectedIndex == 1)
? const TextStyle(color: Colors.blue)
: const TextStyle(color: Colors.black)),
),
const SizedBox(
width: 10,
),
GestureDetector(
onTap: () {
setState(() {
selectedIndex = 2;
});
},
child: Text('Прошло',
style: (selectedIndex == 2)
? const TextStyle(color: Colors.blue)
: const TextStyle(color: Colors.black)),
)
],
),
SizedBox(
height: 200,
child: ListView.builder(
shrinkWrap: true,
scrollDirection: Axis.horizontal,
itemCount: snapshot.requireData.size,
itemBuilder: (context, index) {
if (selectedIndex == 0 &&
(DateFormat('yyyy-MM-dd')
.format(DateTime.now())
.toString() ==
DateFormat('yyyy-MM-dd')
.format(snapshot
.requireData.docs[index]['start_time']
.toDate())
.toString())) {
return Row(
children: [
const SizedBox(width: 10),
GestureDetector(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => DescScreen(
description: snapshot.requireData
.docs[index]['description'],
end_time: snapshot.requireData.docs[index]
['end_time'],
name: snapshot.requireData.docs[index]
['name'],
org: snapshot.requireData.docs[index]
['org'],
photo: snapshot.requireData.docs[index]
['photo'],
place: snapshot.requireData.docs[index]
['place'],
start_time: snapshot.requireData.docs[index]
['start_time'])));
},
child: Container(
height: 200,
width: 150,
decoration: BoxDecoration(
image: DecorationImage(
image: NetworkImage(snapshot
.requireData
.docs[index]['photo']),
fit: BoxFit.cover),
borderRadius: BorderRadius.circular(20)),
child: Align(
alignment: Alignment.bottomLeft,
child: Padding(
padding: const EdgeInsets.only(
bottom: 10, left: 10, right: 10),
child: Text(
snapshot.requireData.docs[index]
['name'],
style: const TextStyle(
color: Colors.white,
fontSize: 15)),
),
),
),
),
const SizedBox(width: 10)
],
);
}
if (selectedIndex == 2 &&
(DateTime.now().day >
snapshot.requireData.docs[index]['start_time']
.toDate()
.day)) {
return Row(
children: [
const SizedBox(width: 10),
GestureDetector(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => DescScreen(
description: snapshot.requireData
.docs[index]['description'],
end_time: snapshot.requireData.docs[index]
['end_time'],
name: snapshot.requireData.docs[index]
['name'],
org: snapshot.requireData.docs[index]
['org'],
photo: snapshot.requireData.docs[index]
['photo'],
place: snapshot.requireData.docs[index]
['place'],
start_time: snapshot.requireData.docs[index]
['start_time'])));
},
child: Container(
height: 200,
width: 150,
decoration: BoxDecoration(
image: DecorationImage(
image: NetworkImage(snapshot
.requireData
.docs[index]['photo']),
fit: BoxFit.cover),
borderRadius: BorderRadius.circular(20)),
child: Align(
alignment: Alignment.bottomLeft,
child: Padding(
padding: const EdgeInsets.only(
bottom: 10, left: 10, right: 10),
child: Text(
snapshot.requireData.docs[index]
['name'],
style: const TextStyle(
color: Colors.white,
fontSize: 15)),
),
),
),
),
const SizedBox(width: 10)
],
);
}
if (selectedIndex == 1 &&
(DateTime.now().day <
snapshot.requireData.docs[index]['start_time']
.toDate()
.day)) {
return Row(
children: [
const SizedBox(width: 10),
GestureDetector(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => DescScreen(
description: snapshot.requireData
.docs[index]['description'],
end_time: snapshot.requireData.docs[index]
['end_time'],
name: snapshot.requireData.docs[index]
['name'],
org: snapshot.requireData.docs[index]
['org'],
photo: snapshot.requireData.docs[index]
['photo'],
place: snapshot.requireData.docs[index]
['place'],
start_time: snapshot.requireData.docs[index]
['start_time'])));
},
child: Container(
height: 200,
width: 150,
decoration: BoxDecoration(
image: DecorationImage(
image: NetworkImage(snapshot
.requireData
.docs[index]['photo']),
fit: BoxFit.cover),
borderRadius: BorderRadius.circular(20)),
child: Align(
alignment: Alignment.bottomLeft,
child: Padding(
padding: const EdgeInsets.only(
bottom: 10, left: 10, right: 10),
child: Text(
snapshot.requireData.docs[index]
['name'],
style: const TextStyle(
color: Colors.white,
fontSize: 15)),
),
),
),
),
const SizedBox(width: 10)
],
);
}
},
),
),
Padding(
padding: const EdgeInsets.only(left: 10.0, right: 10),
child: Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(20),
color: const Color.fromRGBO(240, 244, 253, 1)),
height: 80,
child: const Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Row(
children: [
SizedBox(
width: 20,
),
CircleAvatar(
radius: 25,
child: Icon(Icons.list_alt),
),
SizedBox(
width: 10,
),
Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
'Расписание',
style: TextStyle(
color: Colors.black,
),
),
Text(
'Составлен мастерами!',
style: TextStyle(
color: Colors.black,
),
)
],
),
],
),
Row(
children: [
Icon(Icons.more_vert,
color: Color.fromRGBO(158, 169, 188, 1)),
SizedBox(
width: 10,
)
],
)
],
),
),
),
GestureDetector(
onTap: () {
// Add your gesture logic here
print('Transparent gesture detected!');
},
child: Container(
color: Color.fromARGB(230, 255, 0, 0),
child: Text(
'Tap me',
style: TextStyle(
color: Colors.black,
),
),
),
),
Padding(
padding: const EdgeInsets.only(left: 10.0, right: 10),
child: Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(20),
color: const Color.fromRGBO(240, 244, 253, 1)),
height: 80,
child: const Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Row(
children: [
SizedBox(
width: 20,
),
CircleAvatar(
radius: 25,
child: Icon(Icons.list_alt),
),
SizedBox(
width: 10,
),
Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
'Меню столовой',
style: TextStyle(
color: Colors.black,
),
),
Text(
'Приятного аппетита!',
style: TextStyle(
color: Colors.black,
),
)
],
),
],
),
Row(
children: [
Icon(Icons.more_vert,
color: Color.fromRGBO(158, 169, 188, 1)),
SizedBox(
width: 10,
)
],
)
],
),
),
)
],
);
}),
),
);
}
}
class DescScreen extends StatefulWidget {
String description;
Timestamp end_time;
String name;
String org;
String photo;
String place;
Timestamp start_time;
DescScreen(
{super.key,
required this.description,
required this.end_time,
required this.name,
required this.org,
required this.photo,
required this.place,
required this.start_time});
@override
State<DescScreen> createState() => _DescScreenState();
}
class _DescScreenState extends State<DescScreen> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: ListView(children: [
Padding(
padding: const EdgeInsets.only(right: 20, left: 20),
child: Column(
children: [
Container(
height: 200,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(20),
image: DecorationImage(
image: NetworkImage(widget.photo), fit: BoxFit.cover),
),
child: Align(
alignment: Alignment.bottomRight,
child: Padding(
padding:
const EdgeInsets.only(bottom: 10, right: 10, left: 10),
child: Text(widget.name),
),
),
),
Text(widget.description),
const SizedBox(
height: 30,
),
Container(
height: 1,
color: const Color.fromRGBO(205, 205, 205, 0.49),
),
const SizedBox(
height: 30,
),
Container(
height: 1,
color: const Color.fromRGBO(205, 205, 205, 0.49),
),
const SizedBox(
height: 30,
),
const Text('Информация'),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
const Text('Место проведения'),
SizedBox(
width: 160, child: Center(child: Text(widget.place))),
],
),
const SizedBox(
height: 10,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
const Text('Дата проведения'),
SizedBox(
width: 160,
child: Center(
child: Text(DateFormat('yyyy-MM-dd HH:mm')
.format(widget.start_time.toDate())
.toString()))),
],
),
const SizedBox(
height: 10,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
const Text('Дата окончания'),
SizedBox(
width: 160,
child: Center(
child: Text(DateFormat('yyyy-MM-dd HH:mm')
.format(widget.end_time.toDate())
.toString()))),
],
),
const SizedBox(
height: 10,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
const Text('Организаторы'),
SizedBox(width: 160, child: Center(child: Text(widget.org))),
],
)
],
),
),
]),
);
}
}im“itemCount：snapshot.requireData.size”，它说的是“StateError（Bad state：快照既没有数据也没有错误）”我不知道如何修复它
我试图重新连接firebase它不为我工作，也试图完全在另一个页面。这真的很令人困惑，只有收集不拥有
1条答案
按热度按时间pbossiut1#
在使用
snapshot之前，请确保它有数据希望可以帮到你！