How do I Set Background image in Flutter

Question

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 new Scaffold        body  new Container          child  new Column            mainAxisAlignment  MainAxisAlignment start            children                new Image asset  assets images bulb jpg

User · Answer

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  quot assets aaa jpg quot            fit  BoxFit cover                            You can use any widget     child  Column        children   lt Widget gt

User · Answer

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

User · Answer

body  Container      decoration  BoxDecoration        image  DecorationImage          image  AssetImage  images background png   fit BoxFit cover

User · Answer

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   lt Widget gt           new Container            decoration  new BoxDecoration              image  new DecorationImage image  new AssetImage  images background jpg    fit  BoxFit cover                                    new Center            child  new Text  Hello background

User · Answer

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     - gt  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        - gt  02

User · Answer

You can use Stack to make the image stretch to the full screen   Stack          children   lt Widget gt                      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

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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    Voil    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      lt -- STACK AS THE SCAFFOLD PARENT       children            Container            decoration  BoxDecoration              image  DecorationImage                image  AssetImage  assets images bg png        lt -- BACKGROUND IMAGE               fit  BoxFit cover                                                 Scaffold            backgroundColor  Colors transparent      lt -- SCAFFOLD WITH TRANSPARENT BG           appBar  AppBar              title  Text  NEW USER                backgroundColor  Colors transparent      lt -- APPBAR WITH TRANSPARENT BG             elevation  0      lt -- 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       gt

User · Answer

You can use DecoratedBox   override Widget build BuildContext context      return DecoratedBox      decoration  BoxDecoration        image  DecorationImage image  AssetImage  quot your asset quot    fit  BoxFit cover              child  Center child  FlutterLogo size  300            Output

User · Answer

decoration  BoxDecoration        image  DecorationImage          image  ExactAssetImage  images background png            fit  BoxFit cover                   this also works inside a container

User · Answer

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  quot images background jpg quot                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

User · Answer

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

User · Answer

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   lt Widget gt                 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  quot images 1 jpg quot                            fit  BoxFit fill                                                                                                                                                                            OutPut

User · Answer

import  package flutter material dart    void main     gt  runApp DestiniApp      class DestiniApp extends StatefulWidget      override    DestiniAppState createState     gt   DestiniAppState       class  DestiniAppState extends State lt DestiniApp gt       override   Widget build BuildContext context        return MaterialApp        debugShowCheckedModeBanner  false        home  SafeArea          child  Scaffold            appBar  AppBar              backgroundColor  Color fromRGBO 245  0  87  1               title  Text                 quot Landing Page Bankground Image quot                                         body  Container              decoration  BoxDecoration                image  DecorationImage                    image  ExactAssetImage  quot images appBack jpg quot                      fit  BoxFit cover                                                                                 Output

[dart] How do I Set Background image in Flutter?

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