I'm trying to construct a simple login page for my Flutter app. I've successfully built the TextFields and log in/Sign in buttons. I want to add a horizontal ListView. When I run the code my elements disappear, if I do it without the ListView, it's fine again. How can I do this correctly?
return new MaterialApp(
home: new Scaffold(
appBar: new AppBar(
title: new Text("Login / Signup"),
),
body: new Container(
child: new Center(
child: new Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new TextField(
decoration: new InputDecoration(
hintText: "E M A I L A D D R E S S"
),
),
new Padding(padding: new EdgeInsets.all(15.00)),
new TextField(obscureText: true,
decoration: new InputDecoration(
hintText: "P A S S W O R D"
),
),
new Padding(padding: new EdgeInsets.all(15.00)),
new TextField(decoration: new InputDecoration(
hintText: "U S E R N A M E"
),),
new RaisedButton(onPressed: null,
child: new Text("SIGNUP"),),
new Padding(padding: new EdgeInsets.all(15.00)),
new RaisedButton(onPressed: null,
child: new Text("LOGIN"),),
new Padding(padding: new EdgeInsets.all(15.00)),
new ListView(scrollDirection: Axis.horizontal,
children: <Widget>[
new RaisedButton(onPressed: null,
child: new Text("Facebook"),),
new Padding(padding: new EdgeInsets.all(5.00)),
new RaisedButton(onPressed: null,
child: new Text("Google"),)
],)
],
),
),
margin: new EdgeInsets.all(15.00),
),
),
);
This question is related to
flutter
listview
dart
flutter-layout
flutter-widget
Actually, when you read docs the ListView should be inside Expanded Widget so it can work.
Widget build(BuildContext context) {
return Scaffold(
body: Column(
children: <Widget>[
Align(
child: PayableWidget(),
),
Expanded(
child: _myListView(context),
)
],
));
}
As have been mentioned by others above,Wrap listview with Expanded is the solution.
But when you deal with nested Columns you will also need to limit your ListView to a certain height (faced this problem a lot).
If anyone have another solution please, mention in comment or add answer.
Example
SingleChildScrollView(
child: Column(
children: <Widget>[
Image(image: ),//<< any widgets added
SizedBox(),
Column(
children: <Widget>[
Text('header'), //<< any widgets added
Expanded(child:
ListView.builder(
//here your code
scrollDirection: Axis.horizontal,
itemCount: items.length,
itemBuilder: (BuildContext context, int index) {
return Container();
}
)
),
Divider(),//<< any widgets added
],
),
],
),
);
Try using Slivers:
Container(
child: CustomScrollView(
slivers: <Widget>[
SliverList(
delegate: SliverChildListDelegate(
[
HeaderWidget("Header 1"),
HeaderWidget("Header 2"),
HeaderWidget("Header 3"),
HeaderWidget("Header 4"),
],
),
),
SliverList(
delegate: SliverChildListDelegate(
[
BodyWidget(Colors.blue),
BodyWidget(Colors.red),
BodyWidget(Colors.green),
BodyWidget(Colors.orange),
BodyWidget(Colors.blue),
BodyWidget(Colors.red),
],
),
),
SliverGrid(
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
delegate: SliverChildListDelegate(
[
BodyWidget(Colors.blue),
BodyWidget(Colors.green),
BodyWidget(Colors.yellow),
BodyWidget(Colors.orange),
BodyWidget(Colors.blue),
BodyWidget(Colors.red),
],
),
),
],
),
),
)
return new MaterialApp(
home: new Scaffold(
appBar: new AppBar(
title: new Text("Login / Signup"),
),
body: new Container(
child: new Center(
child: ListView(
//mainAxisAlignment: MainAxisAlignment.center,
scrollDirection: Axis.vertical,
children: <Widget>[
new TextField(
decoration: new InputDecoration(
hintText: "E M A I L A D D R E S S"
),
),
new Padding(padding: new EdgeInsets.all(15.00)),
new TextField(obscureText: true,
decoration: new InputDecoration(
hintText: "P A S S W O R D"
),
),
new Padding(padding: new EdgeInsets.all(15.00)),
new TextField(decoration: new InputDecoration(
hintText: "U S E R N A M E"
),),
new RaisedButton(onPressed: null,
child: new Text("SIGNUP"),),
new Padding(padding: new EdgeInsets.all(15.00)),
new RaisedButton(onPressed: null,
child: new Text("LOGIN"),),
new Padding(padding: new EdgeInsets.all(15.00)),
new ListView(scrollDirection: Axis.horizontal,
children: <Widget>[
new RaisedButton(onPressed: null,
child: new Text("Facebook"),),
new Padding(padding: new EdgeInsets.all(5.00)),
new RaisedButton(onPressed: null,
child: new Text("Google"),)
],)
],
),
),
margin: new EdgeInsets.all(15.00),
),
),
);
Column(
children: <Widget>[
Text('Leading text widget'),
ListView(
shrinkWrap: true,
physics: NeverScrollableScrollPhysics(),
children: <Widget>[
ListTile(
leading: Icon(Icons.map),
title: Text('Map'),
),
ListTile(
leading: Icon(Icons.photo_album),
title: Text('Album'),
),
ListTile(
leading: Icon(Icons.phone),
title: Text('Phone'),
),
],
),
Text('More widget'),
],
);
just use
shrinkWrap: true,
physics: NeverScrollableScrollPhysics(),
properties in listView
Expanded Widget increases it’s size as much as it can with the space available Since ListView essentially has an infinite height it will cause an error.
Column(
children: <Widget>[
Flexible(
child: ListView(...),
)
],
)
Here we should use Flexible widget as it will only take the space it required as Expanded take full screen even if there are not enough widgets to render on full screen.
I've got this problem too. My solution is use Expanded
widget to expand remain space.
new Column(
children: <Widget>[
new Expanded(
child: horizontalList,
)
],
);
Reason for the error:
Column
expands to the maximum size in main axis direction (vertical axis), and so does the ListView
.
Solutions
So, you need to constrain the height of the ListView
. There are many ways of doing it, you can choose that best suits your need.
If you want to allow ListView
to take up all remaining space inside Column
use Expanded
.
Column(
children: <Widget>[
Expanded(
child: ListView(...),
)
],
)
If you want to limit your ListView
to certain height
, you can use SizedBox
.
Column(
children: <Widget>[
SizedBox(
height: 200, // constrain height
child: ListView(),
)
],
)
If your ListView
is small, you may try shrinkWrap
property on it.
Column(
children: <Widget>[
ListView(
shrinkWrap: true, // use it
)
],
)
I have SingleChildScrollView
as a parent, and one Column
Widget and then List View Widget as last child.
Adding these properties in List View Worked for me.
physics: NeverScrollableScrollPhysics(),
shrinkWrap: true,
scrollDirection: Axis.vertical,
Also, you can try use CustomScrollView
CustomScrollView(
controller: _scrollController,
slivers: <Widget>[
SliverList(
delegate: SliverChildBuilderDelegate(
(BuildContext context, int index) {
final OrderModel order = _orders[index];
return Container(
margin: const EdgeInsets.symmetric(
vertical: 8,
),
child: _buildOrderCard(order, size, context),
);
},
childCount: _orders.length,
),
),
SliverToBoxAdapter(
child: _buildPreloader(context),
),
],
);
Tip: _buildPreloader
return CircularProgressIndicator
or Text
In my case i want to show under ListView some widgets. Use Column
does't work me, because widgets around ListView inside Column showing always "up" on the screen, like "position absolute"
Sorry for my bad english
You can use Flex
and Flexible
widgets. for example:
Flex(
direction: Axis.vertical,
children: <Widget>[
... other widgets ...
Flexible(
flex: 1,
child: ListView.builder(
itemCount: ...,
itemBuilder: (context, index) {
...
},
),
),
],
);
Use Expanded to fit the listview in the column
Column(
children: <Widget>[
Text('Data'),
Expanded(
child: ListView()
)
],
)
Here is a very simple method. There are a different ways to do it, like you can get it by Expanded
, Sizedbox
or Container
and it should be used according to needs.
Use Expanded
: A widget that expands a child of a Row
, Column
, or Flex
so that the child fills the available space.
Expanded(
child: ListView(scrollDirection: Axis.horizontal,
children: <Widget>[
OutlineButton(onPressed: null,
child: Text("Facebook")),
Padding(padding: EdgeInsets.all(5.00)),
OutlineButton(onPressed: null,
child: Text("Google")),
Padding(padding: EdgeInsets.all(5.00)),
OutlineButton(onPressed: null,
child: Text("Twitter"))
]),
),
Using an Expanded
widget makes a child of a Row
, Column
, or Flex
expand to fill the available space along the main axis (e.g., horizontally for a Row or vertically for a Column).
Use SizedBox
: A box with a specified size.
SizedBox(
height: 100,
child: ListView(scrollDirection: Axis.horizontal,
children: <Widget>[
OutlineButton(
color: Colors.white,
onPressed: null,
child: Text("Amazon")
),
Padding(padding: EdgeInsets.all(5.00)),
OutlineButton(onPressed: null,
child: Text("Instagram")),
Padding(padding: EdgeInsets.all(5.00)),
OutlineButton(onPressed: null,
child: Text("SoundCloud"))
]),
),
If given a child, this widget forces its child to have a specific width and/or height (assuming values are permitted by this widget's parent).
Use Container
: A convenience widget that combines common painting, positioning, and sizing widgets.
Container(
height: 80.0,
child: ListView(scrollDirection: Axis.horizontal,
children: <Widget>[
OutlineButton(onPressed: null,
child: Text("Shopify")),
Padding(padding: EdgeInsets.all(5.00)),
OutlineButton(onPressed: null,
child: Text("Yahoo")),
Padding(padding: EdgeInsets.all(5.00)),
OutlineButton(onPressed: null,
child: Text("LinkedIn"))
]),
),
The output to all three would be something like this
Source: Stackoverflow.com