I am wanting to get the list of data from the cloud firestore. I have setup everything. With the following code, i am just able to get one data instead of all the list. And I am getting the following error :
Bad state: field does not exist within the DocumentSnapshotPlatform
class HomePage extends StatefulWidget {
static const routeName = 'homePage';
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
late String id;
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Latest"),
backgroundColor: Colors.black,
),
body: StreamBuilder<QuerySnapshot>(
stream: FirebaseFirestore.instance.collection("latest").orderBy('number',descending: true).snapshots(),
builder: (context, snapshot) {
return !snapshot.hasData
? Center(child: CircularProgressIndicator())
: ListView.builder(
itemCount: snapshot.data!.docs.length,
itemBuilder: (context, index) {
DocumentSnapshot data = snapshot.data!.docs[index];
return Stack(
alignment: Alignment.topCenter,
fit: StackFit.loose,
clipBehavior: Clip.hardEdge,
children: [
GestureDetector(
child: Container(
height: 200,
width: MediaQuery.of(context).size.width,
child: Card(
child: Center(
child: Row(
mainAxisAlignment:
MainAxisAlignment.spaceBetween,
children: [
Text(
data['name'],
textAlign: TextAlign.start,
style: const TextStyle(
color: Colors.indigo,
fontWeight: FontWeight.bold,
),
),
])),
)),
onTap: () {
},
)
],
// ),
);
},
);
},
),
);
}
}
I think you should check the document fields name and also make sure all the fields exist in all documents.
Related
I am trying to create a layout where i need to fetch data from two collections parallel. I mean one after the other and than again from first collection. I'm trying using listview and listview.builder but its not working as one of the snapshot is repeating.
I'm providing code and screenshot of output 1. Anyone please help me.As you can see 'proposal2' is repeating twise but i want it in this sequence. 'proposal1,proposal2,proposal1,proposal2' and so on
Here is the source code as well.
View output
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
class proposal1 extends StatefulWidget {
const proposal1({super.key});
#override
State<proposal1> createState() => _proposal1State();
}
class _proposal1State extends State<proposal1> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text("Convenor Portal"),
),
body: SafeArea(
child: StreamBuilder(
stream: FirebaseFirestore.instance
.collection('Convenor')
.doc('classes')
.collection('BS Information Technology')
.doc('groups')
.collection('projects')
.doc('proposals')
.collection('proposal1')
.snapshots(),
builder: (BuildContext context,
AsyncSnapshot<QuerySnapshot> snapshot) {
if (!snapshot.hasData) {
return const Center(
child: CircularProgressIndicator(),
);
}
return Card(
child: Column(children: [
ListView(
shrinkWrap: true,
children: snapshot.data!.docs.map((document) {
return Column(
children: [
Row(
children: [
const Text('Proposal 1'),
const SizedBox(
width: 20,
),
Text(
document["project-title"],
style: const TextStyle(
fontSize: 24,
fontWeight: FontWeight.bold),
),
],
),
method2(),
const SizedBox(
height: 30,
),
],
);
}).toList(),
),
]),
);
}),
));
}
}
method2() {
return SafeArea(
child: StreamBuilder(
stream: FirebaseFirestore.instance
.collection('Convenor')
.doc('classes')
.collection('BS Information Technology')
.doc('groups')
.collection('projects')
.doc('proposals')
.collection('proposal2')
.snapshots(),
builder:
(BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
if (!snapshot.hasData) {
return const Center(
child: CircularProgressIndicator(),
);
}
return Card(
child: ListView(
shrinkWrap: true,
children: snapshot.data!.docs.map((document) {
return Row(
children: [
const Text('Proposal 2'),
const SizedBox(
width: 20,
),
Text(
document["project-title"],
style: const TextStyle(
fontSize: 24, fontWeight: FontWeight.bold),
),
],
);
// method2(),
}).toList()),
);
}));
}
I am trying to navigate to a route and this exception happen. Have look at my code and I don't think I have a FAB and Hero inside this route. Is it because when you tap on each List item, it will show a dialog with Gridview on it? Someone care to explain to me how can this exception happened? It doesn't produce any error on user thought, just throw an exception.
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text("Daftar Dokter")),
body: ListView.separated(
separatorBuilder: (BuildContext context, int i) => Divider(color: Colors.grey[400]),
itemCount: widget.data.length,
itemBuilder: (context, index) {
Doctor doctor = widget.data[index];
return InkWell(
onTap: (){
_buildDialog(context, scheduleService, doctor.doctorId);
},
child: Row(
children: <Widget>[
Padding(
padding: const EdgeInsets.all(8.0),
child: SizedBox(
width: 50,
height: 50,
child: Placeholder(),
),
),
Flexible(
child: SizedBox(
child: ListTile(
title: Text(doctor.name),
subtitle: Text(doctor.specializationName),
),
)
)
],
),
);
}
)
);
}
}
Hope it will solve your issue:
onItem Builder:
itemBuilder: (context, index) {
return Hero(
tag: "itemTag $index",
child: Material(
child: InkWell(
onTap: () {
// _buildDialog(context, scheduleService, doctor.doctorId);
Navigator.of(context).push(MaterialPageRoute(
builder: (context) => Wisgets(
tag: "itemTag $index",
)));
},
child: Row(
children: <Widget>[
Text("Item $index"),
],
),
),
),
);
},
Child Widget for row
class Wisgets extends StatelessWidget {
final String tag;
const Wisgets({Key? key, required this.tag}) : super(key: key);
#override
Widget build(BuildContext context) {
return Hero(
tag: tag,
child: Scaffold(
appBar: AppBar(
title: Text("Child"),
),
body: Column(
children: [
Text("got $tag"),
],
),
),
);
}
}
In my app, i have used BlogTile and CategoryTile widgets (which were made by myself) and I am using them in Contaniers/Columns. When I used SingleChildScrollView with CategoryTile, and made axis as horizontal, it was working fine. But as soon as i use it for BlogTile, it doen't work. I am not able to scroll in my app vertically. But when i try to scroll vertically by clicking on the part between CategoryTile and BlogTile, it works. But when i try to scroll by clicking from anyb other section of it, it doesn't work. Please someone help me
Check this code -
import 'package:flutter/material.dart';
import 'package:news_app/helper/data.dart';
import 'package:news_app/helper/news.dart';
import 'package:news_app/models/article_model.dart';
import 'package:news_app/models/category_models.dart';
class Home extends StatefulWidget {
#override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home> {
List<CategoryModel> categories = new List<CategoryModel>();
List<ArticleModel> articles = new List<ArticleModel>();
bool loading = true;
#override
void initState() {
// TODO: implement initState
super.initState();
categories = getCategories();
getNews();
}
getNews() async {
News newsClass = News();
await newsClass.getNews();
articles = newsClass.news;
setState(() {
loading = false;
print('Done');
});
}
#override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
appBar: AppBar(
title: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(
'Flutter',
style: TextStyle(
color: Colors.black,
),
),
Text(
'News',
style: TextStyle(
color: Colors.blue,
),
),
],
),
//elevation: 2.0,
),
body: loading
? Center(
child: Container(
child: CircularProgressIndicator(),
),
)
: SingleChildScrollView(
scrollDirection: Axis.vertical,
child: SingleChildScrollView(
child: Container(
padding: EdgeInsets.only(top: 10.0),
child: SingleChildScrollView(
child: Column(
children: <Widget>[
///Categories
Container(
padding: EdgeInsets.symmetric(horizontal: 16.0),
height: 70.0,
child: ListView.builder(
itemCount: categories.length,
scrollDirection: Axis.horizontal,
shrinkWrap: true,
itemBuilder: (context, index) {
return CategoryTile(
imageUrl: categories[index].imageUrl,
categoryName: categories[index].categoryName,
);
},
),
),
SizedBox(
height: 30.0,
),
///Blogs
SingleChildScrollView(
child: Container(
child: ListView.builder(
scrollDirection: Axis.vertical,
shrinkWrap: true,
itemCount: articles.length,
itemBuilder: (context, index) {
return BlogTile(
imageUrl: articles[index].urlToImage,
title: articles[index].title,
desc: articles[index].description,
);
},
),
),
),
],
),
),
),
),
),
),
);
}
}
class CategoryTile extends StatelessWidget {
final imageUrl, categoryName;
CategoryTile({this.imageUrl, this.categoryName});
#override
Widget build(BuildContext context) {
return GestureDetector(
onTap: () {},
child: Container(
margin: EdgeInsets.only(right: 16.0),
child: Stack(
children: <Widget>[
ClipRRect(
borderRadius: BorderRadius.circular(6.0),
child: Image.network(
imageUrl,
width: 120.0,
height: 160.0,
fit: BoxFit.cover,
),
),
Container(
alignment: Alignment.center,
width: 120.0,
height: 160.0,
decoration: BoxDecoration(
color: Colors.black26,
borderRadius: BorderRadius.circular(6.0)),
child: Text(
categoryName,
style: TextStyle(
color: Colors.white,
fontWeight: FontWeight.w500,
fontSize: 14.0,
),
),
),
],
),
),
);
}
}
class BlogTile extends StatelessWidget {
final String imageUrl, title, desc;
BlogTile(
{#required this.imageUrl, #required this.desc, #required this.title});
#override
Widget build(BuildContext context) {
return Container(
child: Column(
children: <Widget>[
Image.network(imageUrl),
Text(title),
Text(desc),
],
),
);
}
}
I think the issue here is that you're giving unbounded height and width to some of the ScrollViews.
First off, don't use multiple scrolling widgets nested inside one another. But if you want to do that, try wrapping each of your scrollview within a Container like this:
SingleChildScrollView(
scrollDirection: Axis.vertical,
child: Container(
height: 50.0,
width: 50.0,
child: SingleChildScrollView(
child: ...,
),
),
),
What I'd also suggest is that instead of using a SingleChildScrollView, use a ListView widget. It works almost the same and you can put multiple children inside it. A simple ListView() will work. Don't use ListView.builder or any other aggregate function.
does anyone know why my draggable scrollable sheet doesn't work or why I can't see it?
I tried it in another way it worked, but I didn't use the SafeArea-Widget,
import 'package:flutter/material.dart';
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: PreferredSize(
preferredSize: Size.fromHeight(100.0),
child: AppBar(
//AppBar
),
body: SafeArea(
child: ListView(
children: <Widget>[
Padding(
padding: EdgeInsets.only(left: 20),
child: Text(
dateday,
style: TextStyle(
color: Color(0xff2C8E5D),
fontSize: 150,
),
),
),
SizedBox.expand(
child: DraggableScrollableSheet(builder:
(BuildContext context, ScrollController scrollController) {
return Container(
color: Colors.red,
child: ListView.builder(
controller: scrollController,
itemCount: 25,
itemBuilder: (BuildContext context, int index) {
return ListTile(title: Text("Item $index"));
}),
);
}),
),
],
),
),
);
}
}
Thanks for your help!
Replace the ListView with a Stack:
body: SafeArea(
child: Stack(
children: <Widget>[
Padding(
padding: EdgeInsets.only(left: 20),
child: Text(
dateday,
style: TextStyle(
color: Color(0xff2C8E5D),
fontSize: 150,
),
),
),
SizedBox.expand(
child: DraggableScrollableSheet(
builder:
(BuildContext context, ScrollController scrollController) {
return Container(
color: Colors.red,
child: ListView.builder(
controller: scrollController,
itemCount: 25,
itemBuilder: (BuildContext context, int index) {
return ListTile(title: Text("Item $index"));
}),
);
}),
),
],
),
),
You can use LayoutBuilder and BoxConstraints to provide height and use Expanded flex to control DraggableScrollableSheet's scroll area
code snippet
SafeArea(
child: LayoutBuilder(builder: (context, constraints) {
return ConstrainedBox(
constraints: BoxConstraints(maxWidth: constraints.maxWidth),
child: Column(
children: <Widget>[
Expanded(
flex: 1,
child: Padding(
padding: EdgeInsets.only(left: 20),
child: Text(
"dateday",
...
Expanded(
flex: 3,
child: SizedBox.expand(
working demo
full code
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('DraggableScrollableSheet'),
),
body: SafeArea(
child: LayoutBuilder(builder: (context, constraints) {
print(constraints.maxWidth);
print(constraints.minWidth);
return ConstrainedBox(
constraints: BoxConstraints(maxWidth: constraints.maxWidth),
child: Column(
children: <Widget>[
Expanded(
flex: 1,
child: Padding(
padding: EdgeInsets.only(left: 20),
child: Text(
"dateday",
style: TextStyle(
color: Color(0xff2C8E5D),
fontSize: 150,
),
),
),
),
Expanded(
flex: 3,
child: SizedBox.expand(
child: DraggableScrollableSheet(builder:
(BuildContext context,
ScrollController scrollController) {
return Container(
color: Colors.red,
child: ListView.builder(
controller: scrollController,
itemCount: 25,
itemBuilder: (BuildContext context, int index) {
return ListTile(title: Text("Item $index"));
}),
);
}),
),
),
],
),
);
}),
));
}
}
I am trying to make it scrollable...enter image description here For some reason its not not scrolling and i tried adding singleChildScrollview still not working.... Pls look at the picture to understand better... so i posted the full code so that you guys can help me better... This was the error i got "Consider applying a flex factor (e.g. using an Expanded widget) to force the children of the RenderFlex to fit within the available space instead of being sized to their natural size. This is considered an error condition because it indicates that there is content that cannot be seen. If the content is legitimately bigger than the available space, consider clipping it with a ClipRect widget before putting it in the flex, or using a scrollable container rather than a Flex, like a ListView."
import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/material.dart';
import 'package:memoryblog/helper/authenticate.dart';
import 'package:memoryblog/services/auth.dart';
import 'package:memoryblog/services/database.dart';
import 'package:memoryblog/views/create_blog.dart';
class MemoryRoom extends StatefulWidget {
#override
_MemoryRoomState createState() => _MemoryRoomState();
}
class _MemoryRoomState extends State<MemoryRoom> {
AuthMethod authMethod = new AuthMethod();
DatabaseMethods databaseMethod = new DatabaseMethods();
Stream blogsStream;
Widget BlogsList(){
return Container(
child: blogsStream != null ? Column(
children: <Widget>[
StreamBuilder(
stream: blogsStream,
builder: (context, snapshot){
if(snapshot.data == null) return CircularProgressIndicator();
return ListView.builder(
padding: EdgeInsets.symmetric(horizontal: 16),
itemCount: snapshot.data.documents.length,
shrinkWrap: true,
itemBuilder: (context, index){
return BlogsTile(
authorName: snapshot.data.documents[index].data['memoryName'],
title: snapshot.data.documents[index].data['title'],
description: snapshot.data.documents[index].data['desc'],
imgUrl: snapshot.data.documents[index].data['imgUrl'],
);
}
);
},
)
],
) : Container(
alignment: Alignment.center,
child: CircularProgressIndicator(),
)
);
}
#override
void initState() {
// TODO: implement initState
databaseMethod.getData().then((result){
setState(() {
blogsStream = result;
});
});
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Row(
children: <Widget>[
Text(
"Memory"
),
Text(
"Blog",
style: TextStyle(
color: Colors.blue
),
)
],
),
backgroundColor: Colors.transparent,
elevation: 0.0,
actions: <Widget>[
GestureDetector(
onTap: (){
authMethod.signOut();
Navigator.pushReplacement(context, MaterialPageRoute(
builder: (context) => Authenticate()
));
},
child: Container(
padding: EdgeInsets.symmetric(horizontal: 16),
child: Icon(Icons.power_settings_new)),
)
],
),
body: BlogsList(),
floatingActionButton: Container(
padding: EdgeInsets.symmetric(vertical: 20),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
FloatingActionButton(
onPressed: (){
Navigator.push(context, MaterialPageRoute(
builder: (context) => CreateBlog()
));
},
child: Icon(Icons.add),
)
],
),
),
);
}
}
class BlogsTile extends StatelessWidget {
String imgUrl, title, description, authorName;
BlogsTile({#required this.imgUrl, #required this.title, #required this.description, #required this.authorName,});
#override
Widget build(BuildContext context) {
return Container(
margin: EdgeInsets.only(bottom: 16),
height: 170,
child: Stack(
children: <Widget>[
ClipRRect(
borderRadius: BorderRadius.circular(6),
child: CachedNetworkImage(
imageUrl: imgUrl,
width: MediaQuery.of(context).size.width,
fit: BoxFit.cover,
)
),
Container(
height: 170,
decoration: BoxDecoration(
color: Colors.black45.withOpacity(0.3),
borderRadius: BorderRadius.circular(6)
),
),
Container(
width: MediaQuery.of(context).size.width,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Text(
title,
textAlign: TextAlign.center,
style: TextStyle(fontSize: 25, fontWeight: FontWeight.w500),
),
SizedBox(height: 4,),
Text(
description,
textAlign: TextAlign.center,
style: TextStyle(fontSize: 17, fontWeight: FontWeight.w400),
),
SizedBox(height: 4,),
Text(authorName)
],
),
)
],
),
);
}
}
Use ListView in place of the column. OR
Wrap Column with SingleChildScrollView
return Container(
child: blogsStream != null
? ListView(
children: <Widget>[
StreamBuilder(
stream: blogsStream,
builder: (context, snapshot) {
if (snapshot.data == null) return CircularProgressIndicator();
return ListView.builder(
padding: EdgeInsets.symmetric(horizontal: 16),
itemCount: snapshot.data.documents.length,
shrinkWrap: true,
itemBuilder: (context, index) {
return BlogsTile(
authorName:
snapshot.data.documents[index].data['memoryName'],
title: snapshot.data.documents[index].data['title'],
description:
snapshot.data.documents[index].data['desc'],
imgUrl: snapshot.data.documents[index].data['imgUrl'],
);
});
},
)
],
)
: Container(
alignment: Alignment.center,
child: CircularProgressIndicator(),
),
);