Widget build(BuildContext context){
var height2 = AppBar().preferredSize.height;
return Scaffold(
backgroundColor: Colors.white,
body: Stack(
children: <Widget>[
Image(
image: AssetImage("assets/oral_structure.png"),
fit: BoxFit.fill
),
Padding(
padding: EdgeInsets.only(top:100, left: 100),
child: Container(
height: 60,
width: 60,
child: FlatButton(
child: Text('ㅂ', style: TextStyle(fontSize: 30,fontWeight: FontWeight.bold)),
onPressed: (){
Navigator.push(context, MaterialPageRoute(builder: (context) => B()),);
},
)
),
),
Above is part of my code. The app I'm making is where the appropriate button is placed on top of the background image. However, if you make the code above, the position of the button and the position of the image are different depending on the screen size of the smartphone. The same goes for fixing the height and width. How come there is no way?
#override
Widget build(BuildContext context) {
return Scaffold(
key: v.scaffoldKey,
body: Stack(
children: [
getBackgroundLight(),
],
),
);
}
Widget getBackgroundLight() {
return Stack(
children: [
Image.asset('assets/background.jpg', width: double.infinity),
Transform.rotate(
angle: -SizeConfig.calculateBlockVertical(180) *
(math.pi / SizeConfig.calculateBlockVertical(180)),
child: Container(
decoration: BoxDecoration(
gradient: LinearGradient(
begin: Alignment.center,
end: Alignment.bottomCenter,
colors: [
Get.theme.scaffoldBackgroundColor,
Get.theme.scaffoldBackgroundColor.withOpacity(0.5),
],
),
),
),
),
],
);
}
I am trying to achieve scroll in Flutter Web where I have few containers which are stacked and I use SingleChildScrollView to scroll the widget. However, when I scroll the first container everything working fine but the second one which is a child of the second container responds to the scroll without completing the initial one. And also is there a way to make a sticky header for the second container. How can I make the 3rd container(orange) to scroll after the 2nd(blue) one is finished scrolling? Here is what I am trying to achieve:
https://yobithemes.com/demo/html/freda/dark-video-index.html
And here what I got so far:
class MainScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Stack(
children: <Widget>[
IntroScreen(),
SingleChildScrollView(
child: Container(
child: Column(
children: <Widget>[
SizedBox(
height: MediaQuery.of(context).size.height - 100,
),
Container(
height: MediaQuery.of(context).size.height,
width: MediaQuery.of(context).size.width,
color: Colors.blue,
child: SingleChildScrollView(
child: Column(
children: [
SizedBox(
height: MediaQuery.of(context).size.height,
),
Container(
padding: EdgeInsets.only(top: 100),
height: MediaQuery.of(context).size.height,
width: MediaQuery.of(context).size.width,
color: Colors.orange,
),
],
),
),
),
],
),
),
),
],
),
);
}
}
You can achieve it by using sliver.
SliverToBoxAdapter fill the transparent area with screen height - app bar height.
SliverAppBar: make it sticky by setting floating and pin to true
class MainScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Stack(
children: <Widget>[
IntroScreen(),
CustomScrollView(
slivers: [
SliverToBoxAdapter(
child: Container(
height: MediaQuery.of(context).size.height - 50,
),
),
SliverAppBar(
// toolbarHeight: 50,
floating: true,
pinned: true,
title: Container(
child: Center(child: Text('Header')),
),
),
SliverList(
delegate: SliverChildBuilderDelegate(
(context, index) => Container(
height: MediaQuery.of(context).size.height-50,
color: Colors.primaries[index % Colors.primaries.length],
),
),
),
],
),
],
),
);
}
}
I am quite new to flutter and I've been trying to set up a profile page for my app but it seems like I don't quite understand how these flutter widgets come together, I apologize if my question is quite dumb but I've been googling and failing at getting this to work. So basically I have a scaffold which holds a container thats supposed to display profile info (email, name, etc.), under it I'd like to place a listview, but flutter has been boggling my mind, I can't seem to understand how layouts work together, here is my code. When I try to do buildPage(), I get an error that the scaffold has infinite size, using buildBox() alone works. I'm not sure how to go about this. Any Help is appreciated
import 'package:flutter/material.dart';
class ProfileBox extends StatefulWidget {
final String userEmail;
const ProfileBox(this.userEmail);
#override
_ProfileBoxState createState() => _ProfileBoxState();
}
class _ProfileBoxState extends State<ProfileBox> {
#override
Widget build(BuildContext context) {
return _buildPage();
}
Widget _buildBox(){
return Scaffold(
body: Align(
alignment: Alignment.topCenter,
child: LayoutBuilder(
builder: (BuildContext context, BoxConstraints constraints) {
return Container(
margin: const EdgeInsets.only(top: 20.0),
decoration: BoxDecoration(
color: Color(0xFF8185E2), border: Border.all(
color: Color(0xFF8185E2),
),
borderRadius: BorderRadius.all(Radius.circular(20))
),
height: constraints.maxHeight / 2.5,
width: MediaQuery.of(context).size.width - (MediaQuery.of(context).size.width * 5)/100,
child: Center(
child: Text(
widget.userEmail,
textAlign: TextAlign.center,
),
),
);
},
),
),
);
}
Widget _buildPage()
{
return Column(children: <Widget>[
_buildBox(),
_buildList(),
],);
}
Widget _buildList()
{
return ListView(
children: <Widget>[
ListTile(
title: Text('Sun'),
),
ListTile(
title: Text('Moon'),
),
ListTile(
title: Text('Star'),
),
],
);
}
}
I just modified your code with Scaffold put the top Widget before the SafeArea, Please check the below code of it.
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
class HomeScreen extends StatefulWidget {
#override
State<StatefulWidget> createState() {
// TODO: implement createState
return _HomeScreen();
}
}
class _HomeScreen extends State<HomeScreen> {
#override
Widget build(BuildContext context) {
return _buildPage();
}
Widget _buildPage() {
return SafeArea(
top: true,
child: Scaffold(
body: Column(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Container(
margin: const EdgeInsets.only(top: 20.0),
decoration: BoxDecoration(
color: Color(0xFF8185E2),
border: Border.all(
color: Color(0xFF8185E2),
),
borderRadius: BorderRadius.all(Radius.circular(20))),
height: MediaQuery.of(context).size.height / 2.5,
width: MediaQuery.of(context).size.width -
(MediaQuery.of(context).size.width * 5) / 100,
child: Center(
child: Text(
"YOUR_EMAIL",
textAlign: TextAlign.center,
),
),
),
Expanded(
child: _buildList(),
)
],
),
),
);
Column(
children: <Widget>[
// _buildBox(),
_buildList(),
],
);
}
Widget _buildList() {
return ListView(
children: <Widget>[
ListTile(
title: Text('Sun'),
),
ListTile(
title: Text('Moon'),
),
ListTile(
title: Text('Star'),
),
],
);
}
}
And output of the program as follow
Scaffold Widget should be a top Widget that contains the Column widget and all children Widget. I think you can start learning how to layout Widget in Flutter in order to understand more the way how Widget works, and the good place can be: https://flutter.dev/docs/development/ui/layout#lay-out-a-widget
Coming back to your question, you can just fix a bit to make it work:
class _ProfileBoxState extends State<ProfileBox> {
#override
Widget build(BuildContext context) {
return _buildPage();
}
Widget _buildBox() {
return Align(
alignment: Alignment.topCenter,
child: LayoutBuilder(
builder: (BuildContext context, BoxConstraints constraints) {
return Container(
margin: const EdgeInsets.only(top: 20.0),
decoration: BoxDecoration(
color: Color(0xFF8185E2),
border: Border.all(
color: Color(0xFF8185E2),
),
borderRadius: BorderRadius.all(Radius.circular(20))),
height: constraints.maxHeight / 2.5,
width: MediaQuery.of(context).size.width -
(MediaQuery.of(context).size.width * 5) / 100,
child: Center(
child: Text(
widget.userEmail,
textAlign: TextAlign.center,
),
),
);
},
),
);
}
Widget _buildPage() {
return Scaffold(
body: Column(
children: <Widget>[
_buildBox(),
_buildList(),
],
),
);
}
Widget _buildList() {
return ListView(
children: <Widget>[
ListTile(
title: Text('Sun'),
),
ListTile(
title: Text('Moon'),
),
ListTile(
title: Text('Star'),
),
],
);
}
}
How to make soft keyboard covers/overlaps other widgets instead of pushing them up which causes the UI to go crazy and pixels overflow?
I tried with and without Stack()
I tried with and without resizeToAvoidBottomInset: false,
But still no result!
class Home extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
child: Stack(
children: <Widget>[
ClipPath(
clipper: CustomBackgroundClipper(),
child: Container(
height: 220.0,
decoration: BoxDecoration(
gradient: LinearGradient(
colors: [
gradientStart,
gradientEnd
],
),
),
),
),
Container(
height: MediaQuery.of(context).size.height,
child: HomeTopContainer(),
),
],
),
),
);
}
}
Just add this in Scaffold :
resizeToAvoidBottomInset: false,
I don´t know what is inside your HomeTopContainer, but like this way, its working to me:
class Home extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
resizeToAvoidBottomInset: false,
body: Stack(
children: <Widget>[
ClipPath(
child: Container(
height: 220.0,
decoration: BoxDecoration(
gradient: LinearGradient(
colors: [Colors.green, Colors.blue],
),
),
),
),
Container(
height: MediaQuery.of(context).size.height,
child: Align(
alignment: Alignment.bottomCenter,
child: Column(
children: <Widget>[
Spacer(),
Container(
height: 30,
color: Colors.red,
),
TextField()
],
),
),
),
],
),
);
}
}
I would suggest removing the Align widget completely and adding mainAxisAlignment and crossAxisAlignment properties to your Column widget.
I am trying to set a background image for the home page. I am getting the image place from start of the screen and filling the width but not the height.
Am I missing something in my code? Are there image standards for flutter? Do images scale based on each phone's screen resolution?
class BaseLayout extends StatelessWidget{
#override
Widget build(BuildContext context){
return Scaffold(
body: Container(
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
children: [
Image.asset("assets/images/bulb.jpg")
]
)
)
);
}
}
I'm not sure I understand your question, but if you want the image to fill the entire screen you can use a DecorationImage with a fit of BoxFit.cover.
class BaseLayout extends StatelessWidget{
#override
Widget build(BuildContext context){
return Scaffold(
body: Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("assets/images/bulb.jpg"),
fit: BoxFit.cover,
),
),
child: null /* add child content here */,
),
);
}
}
For your second question, here is a link to the documentation on how to embed resolution-dependent asset images into your app.
If you use a Container as the body of the Scaffold, its size will be accordingly the size of its child, and usually that is not what you want when you try to add a background image to your app.
Looking at this other question, #collin-jackson was also suggesting to use Stack instead of Container as the body of the Scaffold and it definitely does what you want to achieve.
This is how my code looks like
#override
Widget build(BuildContext context) {
return new Scaffold(
body: new Stack(
children: <Widget>[
new Container(
decoration: new BoxDecoration(
image: new DecorationImage(image: new AssetImage("images/background.jpg"), fit: BoxFit.cover,),
),
),
new Center(
child: new Text("Hello background"),
)
],
)
);
}
Screenshot:
Code:
#override
Widget build(BuildContext context) {
return DecoratedBox(
decoration: BoxDecoration(
image: DecorationImage(image: AssetImage("your_asset"), fit: BoxFit.cover),
),
child: Center(child: FlutterLogo(size: 300)),
);
}
You can use Stack to make the image stretch to the full screen.
Stack(
children: <Widget>
[
Positioned.fill( //
child: Image(
image: AssetImage('assets/placeholder.png'),
fit : BoxFit.fill,
),
),
...... // other children widgets of Stack
..........
.............
]
);
Note: Optionally if are using a Scaffold, you can put the Stack inside the Scaffold with or without AppBar according to your needs.
I was able to apply a background below the Scaffold (and even it's AppBar) by putting the Scaffold under a Stack and setting a Container in the first "layer" with the background image set and fit: BoxFit.cover property.
Both the Scaffold and AppBar has to have the backgroundColor set as Color.transparent and the elevation of AppBar has to be 0 (zero).
Voilà! Now you have a nice background below the whole Scaffold and AppBar! :)
import 'package:flutter/material.dart';
import 'package:mynamespace/ui/shared/colors.dart';
import 'package:mynamespace/ui/shared/textstyle.dart';
import 'package:mynamespace/ui/shared/ui_helpers.dart';
import 'package:mynamespace/ui/widgets/custom_text_form_field_widget.dart';
class SignUpView extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Stack( // <-- STACK AS THE SCAFFOLD PARENT
children: [
Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("assets/images/bg.png"), // <-- BACKGROUND IMAGE
fit: BoxFit.cover,
),
),
),
Scaffold(
backgroundColor: Colors.transparent, // <-- SCAFFOLD WITH TRANSPARENT BG
appBar: AppBar(
title: Text('NEW USER'),
backgroundColor: Colors.transparent, // <-- APPBAR WITH TRANSPARENT BG
elevation: 0, // <-- ELEVATION ZEROED
),
body: Padding(
padding: EdgeInsets.all(spaceXS),
child: Column(
children: [
CustomTextFormFieldWidget(labelText: 'Email', hintText: 'Type your Email'),
UIHelper.verticalSpaceSM,
SizedBox(
width: double.maxFinite,
child: RaisedButton(
color: regularCyan,
child: Text('Finish Registration', style: TextStyle(color: white)),
onPressed: () => {},
),
),
],
),
),
),
],
);
}
}
We can use Container and mark its height as infinity
body: Container(
height: double.infinity,
width: double.infinity,
child: FittedBox(
fit: BoxFit.cover,
child: Image.network(
'https://cdn.pixabay.com/photo/2016/10/02/22/17/red-t-shirt-1710578_1280.jpg',
),
),
));
Output:
body: Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage('images/background.png'),fit:BoxFit.cover
)
),
);
decoration: BoxDecoration(
image: DecorationImage(
image: ExactAssetImage("images/background.png"),
fit: BoxFit.cover
),
),
this also works inside a container.
Other answers are great. This is another way it can be done.
Here I use SizedBox.expand() to fill available space and for passing tight constraints for its children (Container).
BoxFit.cover enum to Zoom the image and cover whole screen
Widget build(BuildContext context) {
return Scaffold(
body: SizedBox.expand( // -> 01
child: Container(
decoration: BoxDecoration(
image: DecorationImage(
image: NetworkImage('https://flutter.github.io/assets-for-api-docs/assets/widgets/owl-2.jpg'),
fit: BoxFit.cover, // -> 02
),
),
),
),
);
}
To set a background image without shrinking after adding the child, use this code.
body: Container(
constraints: BoxConstraints.expand(),
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("assets/aaa.jpg"),
fit: BoxFit.cover,
)
),
//You can use any widget
child: Column(
children: <Widget>[],
),
),
You can use the following code to set a background image to your app:
class HomePage extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("images/background.jpg"),
fit: BoxFit.cover,
),
),
// use any child here
child: null
),
);
}
If your Container's child is a Column widget, you can use the crossAxisAlignment: CrossAxisAlignment.stretch to make your background image fill the screen.
I know there is a lot of answers to this question already, but this solution comes with a color gradient around the background image, I think you would like it
import 'package:flutter/material.dart';
class BackgroundImageExample extends StatelessWidget {
const BackgroundImageExample({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return Stack(
children: [
backgroudImage(),
Scaffold(
backgroundColor: Colors.transparent,
body: SafeArea(
child: Column(
children: [
// your body content here
],
),
),
),
],
);
}
Widget backgroudImage() {
return ShaderMask(
shaderCallback: (bounds) => LinearGradient(
colors: [Colors.black, Colors.black12],
begin: Alignment.bottomCenter,
end: Alignment.center,
).createShader(bounds),
blendMode: BlendMode.darken,
child: Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage('your image here'), /// change this to your image directory
fit: BoxFit.cover,
colorFilter: ColorFilter.mode(Colors.black45, BlendMode.darken),
),
),
),
);
}
}
Stack(
children: [
SizedBox.expand(
child: FittedBox(
fit: BoxFit.cover,
child: Image.asset(
Images.splashBackground,
),
)
),
your widgets
])
This Helped me
import 'package:flutter/material.dart';
void main() => runApp(DestiniApp());
class DestiniApp extends StatefulWidget {
#override
_DestiniAppState createState() => _DestiniAppState();
}
class _DestiniAppState extends State<DestiniApp> {
#override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: SafeArea(
child: Scaffold(
appBar: AppBar(
backgroundColor: Color.fromRGBO(245, 0, 87, 1),
title: Text(
"Landing Page Bankground Image",
),
),
body: Container(
decoration: BoxDecoration(
image: DecorationImage(
image: ExactAssetImage("images/appBack.jpg"),
fit: BoxFit.cover
),
),
),
),
),
);
}
}
Output:
#override
Widget build(BuildContext context) {
return Scaffold(
body: SingleChildScrollView(
child: Container(
decoration: const BoxDecoration(
image: DecorationImage(
image: AssetImage('assets/bgmain.jpg'),
//fit: BoxFit.cover
fit: BoxFit.fill),
),
child: Column(
children:
[
//
],
),
)));
}
Image.asset(
"assets/images/background.png",
fit: BoxFit.cover,
height: double.infinity,
width: double.infinity,
alignment: Alignment.center,
),
if still there is a problèm, it' seem like your image is not perfection in the heigth and width
Here is how you can achieve this. First example is with assets image and the second one is with network image.
Local image:
Container(
height: 200,
width: double.infinity,
decoration: const BoxDecoration(
image: DecorationImage(
image: AssetImage("assets/images/cat2.jpg"),
fit: BoxFit.cover),
),
child:
)
Network image:
Container(
height: 200,
width: double.infinity,
decoration: const BoxDecoration(
image: DecorationImage(
image: NetworkImage("https://picsum.photos/id/237/200/300"),
fit: BoxFit.cover),
),
child:
)
You can use FractionallySizedBox
Sometimes decoratedBox doesn't cover the full-screen size.
We can fix it by wrapping it with FractionallySizedBox Widget.
In this widget we give widthfactor and heightfactor.
The widthfactor shows the [FractionallySizedBox]widget should take _____ percentage of the app's width.
The heightfactor shows the [FractionallySizedBox]widget should take _____ percentage of the app's height.
Example : heightfactor = 0.3 means 30% of app's height. widthfactor = 0.4 means 40% of app's width.
Hence, for full screen set heightfactor = 1.0 and widthfactor = 1.0
Tip: FractionallySizedBox goes well with the stack widget. So that you can easily add buttons, avatars, texts over your background image in the stack widget whereas in rows and columns you cannot do that.
For more info check out this project's repository github repository link for this project
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: SafeArea(
child: Stack(
children: <Widget>[
Container(
child: FractionallySizedBox(
heightFactor: 1.0,
widthFactor: 1.0,
//for full screen set heightFactor: 1.0,widthFactor: 1.0,
child: DecoratedBox(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("images/1.jpg"),
fit: BoxFit.fill,
),
),
),
),
),
],
),
),
),
);
}
}
OutPut:
It can be done either of the following ways, based on your requirement:
Background image spanning accross the app Bar
Scaffold(
extendBodyBehindAppBar: true,
appBar: AppBar(
elevation: 0,
title: const Text(
"Home Page",
style: TextStyle(color: Colors.white),
),
backgroundColor: Colors.transparent,
),
body: Container(
height: double.infinity,
width: double.infinity,
decoration: const BoxDecoration(
image: DecorationImage(
fit: BoxFit.fill,
image: NetworkImage(
'https://wallpaperaccess.com/full/2440003.jpg'))
child: < Your Widgets go here >
),
));
Background image not spanning accross the app Bar
Scaffold(
appBar: AppBar(
elevation: 0,
title: const Text(
"Home Page",
style: TextStyle(color: Colors.black),
),
backgroundColor: Colors.transparent,
),
body: Container(
height: double.infinity,
width: double.infinity,
decoration: const BoxDecoration(
image: DecorationImage(
fit: BoxFit.fill,
image: NetworkImage(
'https://wallpaperaccess.com/full/2440003.jpg'))
child: < Your Widgets go here >
),
));
Extra :
To add background image only to the appBar refer this answer