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Hello i am learning the state using the getX methods. When the app loads i am adding the categories in the list but the issue is not updating. can anybody look whats my wrong?
Restaurant Ui Button Page:
HomeController con = Get.put(HomeController());
Widget _cardRestoran(BuildContext context, Restaurants restaurant) {
return GestureDetector(
onTap: () {
con.restoranProducts(context, restaurant);
},
child: Column(
children: [
Container(
margin: EdgeInsets.only(top: 15, left: 20, right: 20),
child: ListTile(
title: Text('${restaurant.name ?? ''}' ,),
subtitle: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
SizedBox(height: 5),
Text(
' Şehir: ${restaurant.il ?? ''} - İlçe: ${restaurant.ilce ?? ''}' ,
maxLines: 2,
style: TextStyle(
fontSize: 13
),
),
SizedBox(height: 15),
],
),
trailing: Container(
height: 70,
width: 60,
// padding: EdgeInsets.all(2),
child: ClipRRect(
borderRadius: BorderRadius.circular(12),
child: FadeInImage(
image: restaurant.image != null
? NetworkImage(restaurant.image ?? '')
: AssetImage('assets/img/no-image.png') as ImageProvider,
fit: BoxFit.cover,
fadeInDuration: Duration(milliseconds: 50),
placeholder: AssetImage('assets/img/no-image.png'),
),
),
),
),
),
Divider(height: 1, color: Colors.grey[300], indent: 37, endIndent: 37,)
],
),
);
}
Home Controller
class HomeController extends GetxController{
void restoranProducts(BuildContext context, Restaurants restaurants) async{
await showMaterialModalBottomSheet(
context: context,
useRootNavigator: true,
builder: (context) => RestoranProducts(restaurants: restaurants),
);
}
}
Restaurant Category Controller :
class ClientRestoranProductListController extends GetxController{
String res_id;
List<Category> categories = <Category>[].obs;
ClientRestoranProductListController(#required this.res_id){
getCategories();
}
void getCategories() async {
var result = await categoriesProvider.restaurantCategory("${this.res_id}");
categories.clear();
categories.addAll(result);
}
}
I also tried seperate but it still didnt work.
Restoran Products Category List UI page:
class RestoranProducts extends StatefulWidget {
final Restaurants? restaurants;
const RestoranProducts({Key? key, required this.restaurants}) : super(key: key);
#override
State<RestoranProducts> createState() => _RestoranProductsState();
}
class _RestoranProductsState extends State<RestoranProducts> {
Widget build(BuildContext context) {
String restoranSahibi = "${widget.restaurants?.user_id}";
ClientRestoranProductListController con = Get.put(ClientRestoranProductListController(restoranSahibi));
return Obx(() => DefaultTabController(
length: con.categories.length,
child: Scaffold(
floatingActionButton: FloatingActionButton(
onPressed: () => setState((){
})),
drawer: HomeNavigator(),
appBar: PreferredSize(
preferredSize: Size.fromHeight(110),
child:AppBar(
flexibleSpace: Container(
decoration: const BoxDecoration(
gradient: LinearGradient(
colors:
[
Colors.amber,
Colors.black,
],
begin: FractionalOffset(0.0, 0.0),
end: FractionalOffset(1.0, 0.0),
stops: [0.0, 1.0],
tileMode: TileMode.clamp,
)
),
margin: EdgeInsets.only(top: 15),
alignment: Alignment.topCenter,
child: Wrap(
direction: Axis.horizontal,
children: [
_textFieldSearch(context),
_iconShoppingBag()
],
),
),
centerTitle: true,
iconTheme: IconThemeData(color: Colors.white),
bottom: TabBar(
isScrollable: true,
indicatorColor: Colors.white,
labelColor: Colors.black,
unselectedLabelColor: Colors.white,
indicatorSize: TabBarIndicatorSize.tab,
indicator: BoxDecoration(
borderRadius: BorderRadius.only(topLeft: Radius.circular(20), topRight: Radius.circular(20)),
color: Colors.white
),
tabs: List<Widget>.generate(con.categories.length, (index) {
return Tab(
child: Text(con.categories[index].name ?? ''),
);
}),
),
) ,
),
body: TabBarView(
key: Key(Random().nextDouble().toString()),
children: con.categories.map((Category category) {
return FutureBuilder(
future: con.getProducts(category.id ?? '1', con.productName.value),
builder: (context, AsyncSnapshot<List<Product>> snapshot) {
if (snapshot.hasData) {
if (snapshot.data!.length > 0) {
return ListView.builder(
itemCount: snapshot.data?.length ?? 0,
itemBuilder: (_, index) {
return _cardProduct(context, snapshot.data![index]);
}
);
}
else {
return NoDataWidget(text: 'No category');
}
}
else {
return NoDataWidget(text: 'No category');
}
}
);
}).toList(),
)
),
));
}
}
i tried seperate ways but it did not work.
I want to place the card in the center
here the code
class _HomeState extends State<Home>{
#override
Widget build(BuildContext context) {
var myActivity=["Join Meeting","Create Meeting", "Schedule Meeting","Yet to be decided"];
var myGridView = new GridView.builder(
itemCount: myActivity.length,
gridDelegate: new SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
itemBuilder: (BuildContext context,int index) {
return new GestureDetector(
child: Card(
elevation: 5.0,
child: Container(
alignment: Alignment.center,
margin: EdgeInsets.only(top: 10.0, bottom: 10.0, left: 10.0),
child: Text(myActivity[index]),
),
),
onTap: () {
showDialog(
barrierDismissible: false,
context: context,
child: CupertinoAlertDialog(
content: Text(myActivity[index],),
actions: <Widget>[
FlatButton(
onPressed: () {
Navigator.of(context).pop();
},
child: Text("Ok"))
],
)
);
},
);
},
);
return Scaffold(
body: myGridView,
);
}
}
Two things required to do that first wrap Grid Widget inside Center Widget & give GridView property as shrinkWrap: true,
#override
Widget build(BuildContext context) {
print("In Test Widget");
// TODO: implement build
var myActivity=["Join Meeting","Create Meeting", "Schedule Meeting","Yet to be decided"];
var myGridView = new GridView.builder(
itemCount: myActivity.length,
shrinkWrap: true,
gridDelegate: new SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
itemBuilder: (BuildContext context,int index) {
return new GestureDetector(
child: Card(
elevation: 5.0,
child: Container(
alignment: Alignment.center,
margin: EdgeInsets.only(top: 10.0, bottom: 10.0, left: 10.0),
child: Text(myActivity[index]),
),
),
onTap: () {
showDialog(
barrierDismissible: false,
context: context,
child: CupertinoAlertDialog(
content: Text(myActivity[index],),
actions: <Widget>[
FlatButton(
onPressed: () {
Navigator.of(context).pop();
},
child: Text("Ok"))
],
)
);
},
);
},
);
return Scaffold(
body: Center(child: myGridView),
);
}
You can wrap your view(Card) with Row component and set mainAxisAlignment attribute to MainAxisAlignment.center like below.
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Card(
elevation: 5.0,
child: Container(
alignment: Alignment.center,
margin: EdgeInsets.only(top: 10.0, bottom: 10.0, left: 10.0),
child: Text(myActivity[index]),
),
)
],
),
To display the GridView at the center of the screen, you can simply wrap myGridView inside a Center widget like this..
return Scaffold(
body: Center(child: myGridView),
);
You also need to set the GridView's shrinkWrap parameter to true. Otherwise gridView will take up the whole screen and so visually the Center widget will have no effect on its position.
Wrap your layout in a Column() and set MainAxisAlignment to center.
Column(
mainAxisAlignment: MainAxisAlignment.center,
child: <--YOUR EXISTING LAYOUT -->)
It can also center horizontally with crossAxisAlignment.
I'm trying to recreate this ui template in which a I have list under that list is a list of items and after all the items is a container displaying a summary. I'm trying to achieve this by wrapping the listview.builder and a container inside a list view however it doesn't show anything. This is the code.
Container(
height: 550.0,
child: ListView(
children: <Widget>[
Expanded(
child: ListView.builder(
physics: ClampingScrollPhysics(),
scrollDirection: Axis.vertical,
itemCount: itemList.length,
itemBuilder: (BuildContext context, int index) {
return SingleItem(
itemImage: itemList[index]['image'],
itemPrice: itemList[index]['price'],
itemName: itemList[index]['name'],
itemCode: itemList[index]['code'],
);
},
),
),
Expanded(
child: Container(
color: Colors.brown,
),
)
],
)
),
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#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> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: SingleChildScrollView(
child: Column(
children: [
ListView.builder(
shrinkWrap: true,
itemCount: 10,
itemBuilder: (BuildContext context, int index) {
return Container(
padding: EdgeInsets.all(20.0),
margin: EdgeInsets.all(10.0),
decoration: BoxDecoration(
border: Border.all(width: 1, color: Colors.grey)),
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
Container(
width: 50,
height: 50,
color: Colors.blueAccent,
),
SizedBox(
width: 30,
),
Column(
children: [Text("Title"), Text('Tag'), Text('Price')],
)
],
),
);
},
),
Container(
width: double.infinity,
child: Card(
color: Colors.redAccent,
elevation: 1.0,
child: (Column(children: [
Text(
'Summary',
style: TextStyle(fontSize: 22, fontWeight: FontWeight.bold),
),
SizedBox(
height: 10.0,
),
Text("""
This is the summary of your products
""")
])),
),
)
],
)),
);
}
}
Try this out:
https://codepen.io/theredcap/pen/qBbjLWp
You can look at this to give you an idea
return Column(
children: [
Expanded(
child: ListView.builder(
itemCount: 6,
itemBuilder: (context, index) {
return Container(
margin: EdgeInsets.all(16),
height: 170,
decoration: BoxDecoration(
color: Colors.grey[300],
borderRadius: BorderRadius.circular(20),
boxShadow: [
BoxShadow(
offset: Offset(0, 15),
blurRadius: 27,
color: Colors.black12)
]),
child: Row(
children: [
Image.asset(
"assets/images/Item_1.png", // your image
fit: BoxFit.cover,
),
Expanded(
child: Padding(
padding: const EdgeInsets.all(5.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Align(
alignment: Alignment.topRight,
child: GestureDetector(
onTap: () {},
child: Image.asset(
"assets/images/Item_1.png", // your icon/image
width: 50,
height: 30,
)),
),
Text(
"Circle Miracle Plate Studs Earrings",
style: TextStyle(
fontSize: 13, fontWeight: FontWeight.bold),
),
Text(
"SKU: 23fe42f44",
style: TextStyle(fontSize: 13),
),
SizedBox(height: 5),
Text(
"\$ 7,500",
style: TextStyle(fontSize: 13),
),
Row(children: [
Text(
"Qty: ",
style: TextStyle(fontWeight: FontWeight.bold),
),
DropdownButton<String>(
value: dropdownValue,
icon: Icon(Icons.arrow_downward),
iconSize: 20,
style: TextStyle(color: Colors.deepPurple),
onChanged: (String newValue) {
setState(() {
dropdownValue = newValue;
});
},
items: <String>['One', 'Two', 'Free', 'Four']
.map<DropdownMenuItem<String>>(
(String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value),
);
}).toList(),
)
]),
Text("Ship By: 30 June2020")
],
),
),
),
],
),
);
}),
),
Container(
height: 100,
decoration: BoxDecoration(color: Colors.white),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text("Summary",
style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold)),
SizedBox(
height: 12,
),
Table(children: [
TableRow(children: [
Text("Subtotal"),
Text("102000"),
]),
TableRow(children: [
Text("Shipping Charge"),
Text("Free"),
]),
TableRow(children: [
Text("Shipping Insurance"),
Text("Free"),
]),
TableRow(children: [
Text("Grand Total"),
Text("102000"),
]),
]),
],
),
)
],
)
;
I have a ListView inside a bottomSheet, that is built using an array of elements. Currently I have one item in there "empty" which is then .clear()ed and populated after an async DB call.
The variable update is correct, and I try to use setState((){}) but the ListView isn't updated at all. I need to close the bottomSheet, reopen it, and the ListView then has the correct items.
Do I need to just call setState or does the bottomSheet builder need to be flagged to update?
Main ListView section:
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('My Map'),
backgroundColor: Colors.green[700],
),
//Put in a stack widget so can layer other widgets on top of map widget
body: Stack(
children: <Widget>[
GoogleMap(
mapType: _currentMapType,
markers: _markers,
onMapCreated: _onMapCreated,
onCameraMove: _onCameraMove,
initialCameraPosition: CameraPosition(
target: _center,
zoom: 11.0,
),
),
Padding(
padding: const EdgeInsets.all(16.0),
child: Align(
alignment: Alignment.bottomCenter,
child: Row(mainAxisSize: MainAxisSize.min, children: <Widget>[
SizedBox(width: 16.0),
Builder(
builder: (context) => FloatingActionButton(
...
),
),
SizedBox(width: 16.0),
FloatingActionButton(
...
),
SizedBox(width: 16.0),
Builder(
builder: (context) => FloatingActionButton(
child: Icon(Icons.file_download, size: 36.0),
backgroundColor: Colors.green,
onPressed: () {
showBottomSheet(
context: context,
builder: (context) {
return ListView(
padding: EdgeInsets.all(15.0),
children: <Widget>[
...
Divider(),
ListTile(
title: Text("Remote JSON Download"),
trailing:
Icon(Icons.refresh),
selected: true,
onTap: _OnPressedReloadJSON, <-------------
),
Divider(),
Container(
height: 150.0,
child: ListView.builder( <-------------
scrollDirection: Axis.horizontal,
itemCount : testList.length,
itemBuilder: (BuildContext context, int index) {
return Container(
padding: EdgeInsets.all(5.0),
margin: EdgeInsets.all(5.0),
width: 150.0,
color: Colors.red,
child: Text(testList[index]),
);
},
),
),
Async Get:
class _MyAppState extends State<MyApp> {
...
_OnPressedReloadJSON() {
fetchJSONAndMakeListTile();
}
...
List<String> testList= ["empty"];
Future<http.Response> fetchJSONAndMakeListTile() async {
final response = await http.get('https://..... file.json');
// If the server did return a 200 OK response, then parse the JSON.
if (response.statusCode == 200) {
List<db_manager.MyObject> myObjects = (json.decode(response.body) as List)
.map((e) => db_manager.MyObject.fromJson(e))
.toList();
testList.clear();
myObjects.forEach((db_manager.MyObject al) {
testList.add(al.code);
print("debug:"+al.code+" - "+al.name); <------------- prints correctly
});
//TODO Does this even work?
//Trigger update of state - ie redraw/reload UI elements
setState(() {});
} else {
// If the server did not return a 200 OK response, then throw an exception.
print(response);
throw Exception('Failed to load json');
}
}
UPDATE:
I've abstracted the BottomSheet builder into another class (as per another answer) as its own StatefulWidget but I can't seem to access the void onPress() method from my main dart file. If the BottomSheet creation/builder is in this separate dart file, how do I call it to build and then update its state with the async call updating the listview contents List?
BottomSheetWidget.dart
class BottomSheetDatabases extends StatefulWidget {
#override
_BottomSheetDatabases createState() => _BottomSheetDatabases();
}
class _BottomSheetDatabases extends State<BottomSheetDatabases> {
void _onpress() {
}
void loadMe() {
}
List<String> testList= ["empty"];
#override
Widget build(BuildContext context) {
return BottomSheet(
builder: (context) {
return ListView(
padding: EdgeInsets.all(15.0),
children: <Widget>[
ListTile(
...
),
Divider(),
Container(
height: 150.0,
child: ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: testList.length,
itemBuilder: (BuildContext context, int index) {
return Container(
key: UniqueKey(),
//TODO ??
padding: EdgeInsets.all(5.0),
margin: EdgeInsets.all(5.0),
width: 150.0,
color: Colors.red,
child: Text(testList[index]),
);
},
),
//),
//),
),
...
Main.dart:
void _loadSheetDatabases() {
BottomSheetWidget bottomSheetwidget = BottomSheetWidget();
bottomSheetwidget.loadMe();
}
Seems to me that a Key are missing into widget that ListView.Builder returns, try to put a UniqueKey() or ValueKey into Container or Text:
Container(
key: UniqueKey(),
padding: EdgeInsets.all(5.0),
margin: EdgeInsets.all(5.0),
width: 150.0,
color: Colors.red,
child: Text(testList[index]),
);
Your ListView is only built when onPressed is called on your FloatingActionButton.
I assume that's why it doesn't get built again when the state changes.
You could wrap the code to build the ListView in a new StatefulWidget with its own state and then update it when testList changes.
I am developing a flutter app, but it show error when I run the app.
I don't understand what is the problem. I think I mix up the logic of how the widget expand in layout.
Please kindly help to solve this issue.
error message:
flutter: The following assertion was thrown during performResize():
flutter: Vertical viewport was given unbounded height.
Viewports expand in the scrolling direction to fill their container.In this case, a vertical
viewport was given an unlimited amount of vertical space in which to expand. This situation
typically happens when a scrollable widget is nested inside another scrollable widget.
Here with my code:
body: Container(
child: Flexible(
child: FirebaseAnimatedList(
query: databaseReference,
itemBuilder: (_, DataSnapshot snapshot,
Animation<double> animation,
int index) {
return new Card(
color: Colors.black38,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
ListTile(
leading: IconButton(
icon: Icon(Icons.format_list_bulleted),
color: Colors.blueAccent,
splashColor: Colors.greenAccent,
onPressed: () {
// Perform some action
debugPrint('button ok');
},
),
title: Text(shopList[index].shopName),
subtitle: Text(shopList[index].address),
),
Container(
child: Flexible(
child: Form(
key: formShopKey,
child: ListView(
children: <Widget>[
ListTile(
leading: Icon(
Icons.money_off,
color: Colors.white,
),
title: TextFormField(
maxLength: 100,
initialValue: "",
maxLines: 3,
//onSaved: (val) => booking.seafoodRequest = val,
//validator: (val) => val == "" ? val : null,
decoration: new InputDecoration(
),
),
),
],
),
),
),
),
ButtonTheme.bar(
// make buttons use the appropriate styles for cards
child: new ButtonBar(
children: <Widget>[
new FlatButton(
child: const Text('BUY TICKETS'),
onPressed: () {
/* ... */
},
),
new FlatButton(
child: const Text('LISTEN'),
onPressed: () {
/* ... */
},
),
],
),
),
],
),
);
},
),
),
);
[1]: https://i.stack.imgur.com/5vAsv.png
[2]: https://i.stack.imgur.com/LuZEl.png
I had to fill in a few gaps but the below should build for you. I also swapped FirebaseAnimatedList with a regular AnimatedList to get it to build. You can compare and adjust the layout.
import 'package:flutter/material.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new MyHomePage(title: 'Flutter Demo'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
#override
Widget build(BuildContext context) {
return new Scaffold(
body: Column(
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Expanded(
child: AnimatedList(
initialItemCount: 10,
itemBuilder: (BuildContext context, int index,
Animation<double> animation) {
return new Card(
color: Colors.black38,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
ListTile(
leading: IconButton(
icon: Icon(Icons.format_list_bulleted),
color: Colors.blueAccent,
splashColor: Colors.greenAccent,
onPressed: () {
// Perform some action
debugPrint('button ok');
},
),
title: Text('Name'),
subtitle: Text('Address'),
),
Container(
constraints: BoxConstraints(
minHeight: 100.0,
maxHeight: 200.0,
),
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Expanded(
child: Form(
child: ListView(
children: <Widget>[
ListTile(
leading: Icon(
Icons.money_off,
color: Colors.white,
),
title: TextFormField(
maxLength: 100,
initialValue: "",
maxLines: 3,
//onSaved: (val) => booking.seafoodRequest = val,
//validator: (val) => val == "" ? val : null,
decoration: new InputDecoration(),
),
),
],
),
),
),
],
),
),
ButtonTheme.bar(
// make buttons use the appropriate styles for cards
child: new ButtonBar(
children: <Widget>[
new FlatButton(
child: const Text('BUY TICKETS'),
onPressed: () {
/* ... */
},
),
new FlatButton(
child: const Text('LISTEN'),
onPressed: () {
/* ... */
},
),
],
),
),
],
),
);
},
),
),
],
),
);
}
}