I'm using a ListView to populate a list of items, followed by a button:
ListView(
padding: EdgeInsets.all(10),
shrinkWrap: true,
children: <Widget>[
budgetEntry(snapshot.data[0]),
budgetEntry(snapshot.data[1]),
budgetEntry(snapshot.data[2]),
FlatButton(
child: Text('Manage budgets'),
onPressed: () { },
)
); // ListView
This works, but I want to know how I can achieve the same result with a dynamic number of items (snapshot.data.length) instead of manually using snapshot.data[0], snapshot.data[1], ...
I've tried using ListView.builder like so, but now I can't append a button at the end of the ListView:
ListView.builder(
itemCount: snapshot.data.length,
itemBuilder: (BuildContext context, int index) {
return budgetEntry(snapshot.data[index]);
});
Related
enter image description here
I want each list item to have its own route .I have attached a screenshot. My list view is customized, each item has its own name
Your question doesn't explain much, but rather than listview use listview.builder and then you can return any widget and pass your route based on itemindex.
ListView.builder(
itemCount: 10, *//Number of items in your static or dynamic*
itemBuilder: (context, index) {
return YourNewCommonWidgetForEveryItem(index);
},
),
For example I've to navigate the first item to somewhere else
Widget YourNewCommonWidgetForEveryItem(int Index){
return GestureDetector(
onTap:()=> index==0 ? locationtofirstItem : defaullt,
child: yourDesign(),
),
}
OfCourse the Above method won't work if you don't know where to navigate which item.
body: new ListView(
padding: const EdgeInsets.all(20.0),
children: List.generate(choices.length, (index) {
return Center(
child: ChoiceCard(
choice: choices[index],
item: choices[index],
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => Detail(choice: choices[index])),
);},),);}))
I have nested ListView in a ListView.
So I want to disable scroll for child ListView programmatically.
How to do it.
Thanks,
You can prevent it by using physics: NeverScrollableScrollPhysics() for example
Expanded(
child: ListView.builder(
physics: NeverScrollableScrollPhysics(), <-----
scrollDirection: Axis.horizontal,
itemCount: status == false ? list.length : 5,
itemBuilder: (ctx, i) => ChangeNotifierProvider.value(
value: list[i], child: ListItem()),
),
If you want to set it programatically, use a setState() to update the physics type like this:
ScrollPhysics physics = AlwaysScrollableScrollPhysics();
return Stack(
children: [
ListView(
physics: physics,
),
RaisedButton(
child: Text("Disable scrolling"),
onPressed: () {
setState((){
if(physics is AlwaysScrollableScrollPhysics){
physics = NeverScrollableScrollPhysics();
} else {
physics = AlwaysScrollableScrollPhysics();
}
});
},
),
]
);
You need to set this "physics" property value "NeverScrollableScrollPhysics" inside the nested listview.
example:
ListView.builder(
physics: NeverScrollableScrollPhysics(),
itemBuilder: () {}
),
This is just a simple todo list app. I want to implement a feature which lets me mark a task as complete when swiping right and delete the task when swiping left. This app uses a database and stores an added task in a list of type database (List<TodoItem> Itemlist= <TodoItem>[];).
Is it possible to use flutter_slidable?.
I have tried using Dismissible but i could only get it to delete the task.
List<TodoItem> Itemlist= <TodoItem>[];
SingleChildScrollView(
child: ListView.builder(
scrollDirection: Axis.vertical,
shrinkWrap: true,
itemCount: Itemlist.length,
itemBuilder: (BuildContext context, int index){
String item = Itemlist[index].toString();
return Dismissible(
key: Key(UniqueKey().toString()),
onDismissed: (direction){
setState((){
deleteItem(Itemlist[index].id, index);
}
);
},
background: Container(
child: Icon(Icons.delete),
color: Colors.red,
alignment: Alignment.centerLeft,
),
child: Itemlist[index],
);
}
),
)
I want to get the same result as below but am unsure on how to pass the listview.builder in Slidable.
Wrap your tile widget with Slidable
Setup "actionPane" and "actions" parameters for Slidable
I have a page the has a list with refresh indicator. When I have many elements in the list (filling the whole view and more, i.e. I can scroll), the refresh indicator works.
However, when I have only one or two elements in the list (nothing to scroll), then the refresh indicator doesn't work. Is this the expected behaviour? Is there a way to get the indicator to work also for short lists?
I tried wrapping the list view (child of refresh indicator) with a scroll bar but the problem still persists.
Future<void> _onRefresh() async {
_getPeople();
}
#override
Widget build(BuildContext context) {
super.build(context);
return new Container(
child: _items.length == 0
? Center(child: CircularProgressIndicator())
: new RefreshIndicator(
onRefresh: _onRefresh,
child: Scrollbar(
child: new ListView.builder(
controller: controller,
itemBuilder: (context, index) {
return PeopleCard(
People: _items[index],
source: 2,
);
},
itemCount: _items.length,
),
)),
);
}
If the length of the items list is 1 or 2 or any amount that doesn't need scrolling, refresh indicator should also work.
Set the physics to AlwaysScrollableScrollPhysics just like the below code.
new RefreshIndicator(
key: _refreshIndicatorKey,
color: Colors.blue,
onRefresh: (){
setState(() {
_future = fetchPosts(http.Client());
_getAvalailableSlots();
});
},
child: ListView.builder(
physics: AlwaysScrollableScrollPhysics(),
itemCount: data.length,
itemBuilder: (context, i) {
//do something
}
)
)
Case 1:
Use AlwaysScrollableScrollPhysics() in your Listview or SingleChildScrollView.
physics: const AlwaysScrollableScrollPhysics(),
Case 2:
If you want to use other scroll physics, use this way...
physics: BouncingScrollPhysics(
parent: AlwaysScrollableScrollPhysics(),
),
Case 3:
Make sure you didn't make shrinkWrap, true. ShrinkWrap has to be false like default.
shrinkWrap: true. ❌
shrinkWrap: false. ✅
shrinkWrap: false,
Case 4:
If you have any custom widgets other than a listview, use stack and listview this way...
RefreshIndicator(
onRefresh: () async {
print('refreshing');
},
Stack(
children: [
YourWidget(),
ListView(
physics: const AlwaysScrollableScrollPhysics(),
),
],
),
),
To use with BouncingScrollPhysics:
RefreshIndicator(
onRefresh: () async {
},
child: ListView.builder(
physics: BouncingScrollPhysics(
parent: AlwaysScrollableScrollPhysics()),
itemBuilder: (context, index) {
return Text("${index}");
}),
To make RefreshIndicator always appear, set physics: const AlwaysScrollableScrollPhysics() for the scrollable child like below.
ListView(
physics: const AlwaysScrollableScrollPhysics(),
children: <Widget>[widget.bodyWidget]
)
If you still have some errors, the below might help.
ListView widget needs to have height value to be "always" scrollable vertically. So wrap it with SizedBox or some other proper widget and set the height.
How to fix the height? Get the height of viewport using MediaQuery.of(context).size.height and, if needed, subtract the value of non-scrollable part.
If you use SingleChildScrollView and it's not working with AlwaysScrollableScrollPhysics(), it is because the child doesn't have height. fix the child's height or just use ListView.
To sum up, the following worked for me.
sizes.bottomNavigationBar and sizes.appBar are the constant variables I made to customize the appbar and navbar.
RefreshIndicator(
onRefresh: widget.onRefresh,
child: SizedBox(
height: MediaQuery.of(context).size.height -
sizes.bottomNavigationBar -
sizes.appBar,
child: ListView(
physics: const AlwaysScrollableScrollPhysics(),
children: <Widget>[widget.bodyWidget]
)),
)
If you're finding any reliability, Refresh indicator does not show up part of the official doc would help.
If you're using ListView inside of Column with Expanded.
Try Removing
shrinkWrap:true
Widget servicesListview() {
return Container(
decoration: new BoxDecoration(color: const Color(0xFFEAEAEA)),
child: Column(
children: <Widget>[
ListView.builder(
scrollDirection: Axis.vertical,
itemCount: menServicesList.length,
itemBuilder: (BuildContext context, int index) {
Text(menServicesList[index].name);
}),
],
));
}
I am implementing listview in my flutter project whenever i call this method list is not visible.The page becomes blank,help me to solve this
I have a same problem.
The ListView.builder don't work inside a Column, this necessary use the Expanded.
The Expanded widget allows you to expand and fill the space with the relative widget.
See this:
child: Column(
children: <Widget>[
Expanded(
child: ListView.builder(
.......
)
)
]
)
Wrap your ListView inside of a Expanded or a Container widget, if you use a Container, you'll need to set a height/width.
This happens because ListView doesn't have a height/width property to edit.
EDIT
Don't forget to return your Text inside the itemBuilder property.
You're missing the return statement in your itemBuilder
itemBuilder: (BuildContext context, int index) {
return Text(menServicesList[index].name);
}),
or
itemBuilder: (BuildContext context, int index) => Text(menServicesList[index].name)),
If you remove Column widget from the ListView, the list will definitely appear
and if you want to give a decoration property to each element of a ListView.
Widget servicesListview() {
return ListView.builder(
scrollDirection: Axis.vertical,
itemCount: menServicesList.length,
itemBuilder: (BuildContext context, int index) {
Container(
decoration: new BoxDecoration(color: const Color(0xFFEAEAEA)),
child: Text(menServicesList[index].name)
);
})
}