Related
Hello everyone I am new to flutter and I am facing a difficulty in my website development. I have three different classes:
Main menu (which is not in my Navbar but a row in my body widget)
Menu Items ( dropdown item of a menu item)
Carousel slider (item in my body widget)
I want to connect a sub menu item to my carousel slider container using an 'OnTap' function in the sub menu class. It seems the only solution is to combine the widgets but I don't want to since they are not supposed to be close but just linked via a click. In few words I am in search of codes where we have a click on a menu sub-item and the screen context scrolls down to the specific item on the canvas without changing page.
Here a code example:
//my main class
import 'package:flutter/material.dart';
import 'package:navigation_scroll/widgets/view/homePage.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatefulWidget {
#override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: MyHomePage(),
);
}
}
//my homePage class
import 'package:flutter/material.dart';
import 'package:navigation_scroll/widgets/carousels/carouselOne.dart';
import 'package:navigation_scroll/widgets/carousels/carouselTwo.dart';
import 'package:navigation_scroll/widgets/menu/dropDownMenu.dart';
class MyHomePage extends StatefulWidget {
#override
State<StatefulWidget> createState() {
return MyHomePageState();
}
}
//where you have the combination of all the widgets
class MyHomePageState extends State<MyHomePage> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Center(child: Text("ListView")),
),
body: Container(
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
SizedBox(
height: 30.0,
),
Container(
child:ListViewDemo(),
),
SizedBox(
height: 50.0,
),
Container(
child: CarouselOne()),
SizedBox(
height: 50.0,
),
Container(
child: CarouselTwo()),
],
),
)
);
}
}
import 'package:carousel_slider/carousel_slider.dart';
import 'package:flutter/material.dart';
// this is the first carousel that appears on screen
class CarouselOne extends StatelessWidget {
#override
Widget build(BuildContext context) {
return CarouselSlider(
items: [
//1st Image of Slider
Container(
margin: EdgeInsets.all(6.0),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(8.0),
image: DecorationImage(
image: NetworkImage("https://cdn.eso.org/images/thumb300y/eso1907a.jpg"),
fit: BoxFit.cover,
),
),
),
//2nd Image of Slider
Container(
margin: EdgeInsets.all(6.0),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(8.0),
image: DecorationImage(
image: NetworkImage("https://cdn.eso.org/images/thumb300y/eso1907a.jpg"),
fit: BoxFit.cover,
),
),
),
//3rd Image of Slider
Container(
margin: EdgeInsets.all(6.0),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(8.0),
image: DecorationImage(
image: NetworkImage("https://cdn.eso.org/images/thumb300y/eso1907a.jpg"),
fit: BoxFit.cover,
),
),
),
//4th Image of Slider
Container(
margin: EdgeInsets.all(6.0),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(8.0),
image: DecorationImage(
image: NetworkImage("https://cdn.eso.org/images/thumb300y/eso1907a.jpg"),
fit: BoxFit.cover,
),
),
),
//5th Image of Slider
Container(
margin: EdgeInsets.all(6.0),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(8.0),
image: DecorationImage(
image: NetworkImage("https://cdn.eso.org/images/thumb300y/eso1907a.jpg"),
fit: BoxFit.cover,
),
),
),
],
//Slider Container properties
options: CarouselOptions(
height: 180.0,
enlargeCenterPage: true,
autoPlay: true,
aspectRatio: 16 / 9,
autoPlayCurve: Curves.fastOutSlowIn,
enableInfiniteScroll: true,
autoPlayAnimationDuration: Duration(milliseconds: 800),
viewportFraction: 0.8,
),
);
}
}
import 'package:carousel_slider/carousel_slider.dart';
import 'package:flutter/material.dart';
// this is the second carousel that appears on screen
class CarouselTwo extends StatelessWidget {
#override
Widget build(BuildContext context) {
return CarouselSlider(
items: [
//1st Image of Slider
Container(
margin: EdgeInsets.all(6.0),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(8.0),
image: DecorationImage(
image: NetworkImage("https://cdn.eso.org/images/thumb300y/eso1907a.jpg"),
fit: BoxFit.cover,
),
),
),
//2nd Image of Slider
Container(
margin: EdgeInsets.all(6.0),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(8.0),
image: DecorationImage(
image: NetworkImage("https://cdn.eso.org/images/thumb300y/eso1907a.jpg"),
fit: BoxFit.cover,
),
),
),
//3rd Image of Slider
Container(
margin: EdgeInsets.all(6.0),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(8.0),
image: DecorationImage(
image: NetworkImage("https://cdn.eso.org/images/thumb300y/eso1907a.jpg"),
fit: BoxFit.cover,
),
),
),
//4th Image of Slider
Container(
margin: EdgeInsets.all(6.0),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(8.0),
image: DecorationImage(
image: NetworkImage("https://cdn.eso.org/images/thumb300y/eso1907a.jpg"),
fit: BoxFit.cover,
),
),
),
//5th Image of Slider
Container(
margin: EdgeInsets.all(6.0),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(8.0),
image: DecorationImage(
image: NetworkImage("https://cdn.eso.org/images/thumb300y/eso1907a.jpg"),
fit: BoxFit.cover,
),
),
),
],
//Slider Container properties
options: CarouselOptions(
height: 180.0,
enlargeCenterPage: true,
autoPlay: true,
aspectRatio: 16 / 9,
autoPlayCurve: Curves.fastOutSlowIn,
enableInfiniteScroll: true,
autoPlayAnimationDuration: Duration(milliseconds: 800),
viewportFraction: 0.8,
),
);
}
}
import 'package:flutter/material.dart';
// this is the dropdown menu from which we select and want to arrive at the carousel slider
class ListViewDemo extends StatefulWidget {
#override
State<StatefulWidget> createState() {
return ListViewDemoState();
}
}
class ListViewDemoState extends State<ListViewDemo> {
List<String> selectedItemValue = List<String>();
#override
void initState() {
// TODO: implement initState
super.initState();
}
#override
Widget build(BuildContext context) {
return Container(
height: 50.0,
child: ListView (
children: [
Center(
child: DropdownButton(
//value:'ABOUT',
onChanged: (value) { },
items: [
DropdownMenuItem(
child: GestureDetector(
child: Text(
'VISION'
),
onTap: (){}, // we need to write a function here that does what we want to a container in the carousel slider
),
),
DropdownMenuItem(
child: Text(
'MISSION'
),
onTap: (){}, // we need to write a function here that does what we want to a container in the carousel slider
),
DropdownMenuItem(
child: Text(
'TEAM'
),
onTap: (){}, // we need to write a function here that does what we want to a container in the carousel slider
),
],
),
),
],
)
);
}
}
I think you can achieve this with CarouselSlider controller you can trigger it onTap and scroll it to your desired destination
This can be achieved using CarouselController attached with your CarouselSlider.
On Button/Menu click, you just need to call
carouselController.jumpToPage(whateverYourTargetedPageNoInInt);
I want to add a dot indicator to pageview. When a person scrolls the image to the right to left image changes on my code. NO problem with there but I couldn't manage to add a dot indicator to my code. How can I put a dot indicator when I scroll across images also the dots switch to the order of images.........................................................................................................
PageView.builder(
itemCount: totalCards.toInt(),
itemBuilder: (context, i) {
return Container(
margin: EdgeInsets.only(top: 10),
child: Container(
child: Column(
mainAxisAlignment:
MainAxisAlignment.spaceBetween,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Expanded(
child: PageView(
children: <Widget>[
Container(
decoration: BoxDecoration(
borderRadius:
BorderRadius.circular(4.0),
image: DecorationImage(
image: AssetImage(
photos[startphoto]),
fit: BoxFit.cover)),
),
Container(
decoration: BoxDecoration(
borderRadius:
BorderRadius.circular(4.0),
image: DecorationImage(
image: AssetImage(
photos[startphoto1]),
fit: BoxFit.cover)),
),
Container(
decoration: BoxDecoration(
borderRadius:
BorderRadius.circular(4.0),
image: DecorationImage(
image: AssetImage(
photos[startphoto2]),
fit: BoxFit.fitHeight)),
),
Container(
decoration: BoxDecoration(
borderRadius:
BorderRadius.circular(4.0),
image: DecorationImage(
image: AssetImage(
photos[startphoto3]),
fit: BoxFit.cover)),
),
],
),
),
],
),
)
);
},
),
),
You can do that with this package: https://pub.dev/packages/page_view_indicators
In the example you can see how to implement it.
EDIT: Implement your dot indicator like this:
class HomeScreen extends StatefulWidget {
#override
_HomeScreenState createState() => _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> {
final ValueNotifier<int> _pageNotifier = new ValueNotifier<int>(0);
final PageController _pageController = new PageController();
#override
Widget build(BuildContext context) {
return Column(
children: [
PageView.builder(
itemCount: totalCards.toInt(),
controller: _pageController,
itemBuilder: (context, i) {
...
},
onPageChanged:(index) {
setState(() {
_pageNotifier.value = index;
});
},
),
Center(
child: CirclePageIndicator(
currentPageNotifier: _pageNotifier,
itemCount: totalCards.toInt(),
),
)
],
);
}
}
I'm trying to display a circular image with a shadow, but on Flutter web, the shadow gets cut at the edges, while working fine on mobile.
Minimum code to reproduce is:
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(
home: Scaffold(
body: ListView(
scrollDirection: Axis.horizontal,
children: [
Column(
children: <Widget>[
Container(
width: 100,
height: 100,
decoration: BoxDecoration(
boxShadow: [
BoxShadow(color: Colors.black, blurRadius: 12.0),
],
shape: BoxShape.circle,
image: DecorationImage(
fit: BoxFit.fill,
image: NetworkImage(
'https://images.theconversation.com/files/93616/original/image-20150902-6700-t2axrz.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=1000&fit=clip')))),
],
)
],
),
),
);
}
}
I tried adding padding to the container but it didn't help, not sure what else to do.
Quick workaround - Add one more container on top and set it as transparent with your fixed size.
color: Colors.transparent
This makes it draw the entire container therefore not clipping it's child container, so you can add padding to the child and make enough space for the shadows.
Container(
width: 100,
height: 100,
color: Colors.transparent,
child: Padding(
padding: const EdgeInsets.all(15.0),
child: Container(
decoration: BoxDecoration(
boxShadow: [
BoxShadow(color: Colors.black, blurRadius: 12.0),
],
shape: BoxShape.circle,
image: DecorationImage(
fit: BoxFit.fill,
image: NetworkImage(
'https://images.theconversation.com/files/93616/original/image-20150902-6700-t2axrz.jpg')))),
),
),
Reference: https://github.com/flutter/flutter/issues/32215#issuecomment-596143172
I need to push or rather position some elements inside my Widget, the main idea is to place them at the bottom of the view
The idea is to position the elements of the blue box in the other blue box
class Principal extends StatelessWidget {
#override
Widget build(BuildContext context) {
final screenWidth = MediaQuery.of(context).size.width;
final screenHeight = MediaQuery.of(context).size.height;
final List<String> _listItem = [
'assets/foto.jpg',
'assets/foto2.jpg',
'assets/foto3.png',
'assets/foto4.jpg',
];
return Stack(
children: <Widget>[
Scaffold(
body: SafeArea(
child: Stack(
children: <Widget>[
_containerImg(context,screenWidth,screenHeight),
_table(_listItem),
],
),
),
),
],
);
}
Widget _containerImg(BuildContext context,ScreenWidth,ScreenHeight){
return Container(
height: ScreenHeight,
width: ScreenWidth,
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage('assets/480359.jpg'),
fit: BoxFit.cover,
),
),
);
}
Widget _table(List<String> _listItem){
return GridView.count(crossAxisCount: 4,
padding: EdgeInsets.all(5.0),
crossAxisSpacing: 1.0,
mainAxisSpacing: 1.0,
children: _listItem.map((item) => Card(
child: Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(50.0),
image: DecorationImage(
image: AssetImage(item),
fit: BoxFit.cover,
),
),
),
),
).toList()
);
}
}
I leave samples of the code, I tried to place a SizedBox, and an expanded one in the middle of the Widget, but it didn't work
class Principal extends StatelessWidget {
#override
Widget build(BuildContext context) {
final screenWidth = MediaQuery.of(context).size.width;
final screenHeight = MediaQuery.of(context).size.height;
final List<String> _listItem = [
'https://images.unsplash.com/photo-1535498730771-e735b998cd64?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&w=1000&q=80',
'https://images.pexels.com/photos/67636/rose-blue-flower-rose-blooms-67636.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500',
'https://images.unsplash.com/photo-1494548162494-384bba4ab999?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&w=1000&q=80',
'https://images.unsplash.com/photo-1503023345310-bd7c1de61c7d?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&w=1000&q=80',
];
return Scaffold(
body: SafeArea(
child: _containerImg(context, screenWidth, screenHeight, _listItem),
),
);
}
Widget _containerImg(
BuildContext context, ScreenWidth, ScreenHeight, List<String> listItem) {
return Container(
height: ScreenHeight,
width: ScreenWidth,
decoration: BoxDecoration(
image: DecorationImage(
image: NetworkImage(
"https://aegis-be.com.sg/wp-content/themes/aegis_theme/images/banner_2.jpg"),
fit: BoxFit.cover,
),
),
alignment: Alignment.bottomCenter,
child: _table(listItem),
);
}
Widget _table(List<String> _listItem) {
return Wrap(
verticalDirection: VerticalDirection.up,
children: _listItem
.map(
(item) => Card(
child: Container(
height: 80,
width: 80,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(50.0),
image: DecorationImage(
image: NetworkImage(item),
fit: BoxFit.cover,
),
),
),
),
)
.toList());
}
}
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