Reputation: 20495

How do I stretch an image to fit the whole background (100% height x 100% width) in Flutter?

I have an image that doesn't match the aspect ratio of my device's screen. I want to stretch the image so that it fully fills the screen, and I don't want to crop any part of the image.

CSS has the concept of percentages, so I could just set height and width to 100%. But it doesn't seem like Flutter has that concept, and it's bad to just hard code the height and width, so I'm stuck.

Here's what I have (I'm using a Stack since I have something in the foreground of the image):

Widget background = new Container(
  height: // Not sure what to put here!
  width: // Not sure what to put here!
  child: new Image.asset(
    asset.background,
    fit: BoxFit.fill, // I thought this would fill up my Container but it doesn't
  ),
);

return new Stack(
  children: <Widget>[
    background,
    foreground,
  ],
);

Upvotes: 151

Answers (19)

HaRjeet DeBnath

Reputation: 31

This will work if you want to add a fit background image in Flutter:

class Myname extends StatelessWidget {
  const Myname({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: SafeArea(
        child: Container(
          decoration: const BoxDecoration(
            image: DecorationImage(
              image: AssetImage("assets/aj.jpg"),
              fit: BoxFit.cover,
            ),
          ),
          child: Scaffold(
            backgroundColor: Colors.transparent,
            body: Column(),
          ),
        ),
      ),
    );
  }
}

Now you can add the rest of the things inside the Column()

Upvotes: 3

zakb

Reputation: 131

The best example for this question I found on this page: https://flutterbeads.com/set-background-image-in-flutter/

By using BoxDecoration and DecorationImage:

Container(
  constraints: BoxConstraints.expand(),
  decoration: const BoxDecoration(
    image: DecorationImage(
        image: AssetImage("assets/images/cat2.jpg"), 
        fit: BoxFit.cover),
  )

Upvotes: 9

alireza daryani

Reputation: 835

I didn’t find answer in this post, But I found the fix:

        Positioned(
            bottom: 0,
            top: 0,
            child: Image.asset(
          'assets/images/package_bg.png',
        )),

This code make image fit to height on the stack.

Upvotes: 2

klinsman Agam

Reputation: 90

This should work,

Image.asset('assets/bg.jpg',fit: BoxFit.cover,),

Upvotes: 5

CNK

Reputation: 713

For me, to develop for web, works fine the following:

Image(
  image: AssetImage('lib/images/portadaSchamann5.png'),
  alignment: Alignment.center,
  height: double.infinity,
  width: double.infinity,
  fit: BoxFit.fill,
),

Upvotes: 48

Nikita Hans

Reputation: 21

I ran into problems with just an FittedBox so I wrapped my Image in an LayoutBuilder:

LayoutBuilder( 
   builder: (_, constraints) => Image(
      fit: BoxFit.fill,
      width: constraints.maxWidth,
      image: AssetImage(assets.example),
   ),
)

This worked like a charm and I suggest you give it a try.
Of course you can use height instead of width, this is just what I used.

Upvotes: 2

MobileMon

Reputation: 8661

I set width and height of a container to double.infinity like so:

Container(
        width: double.infinity,
        height: double.infinity,
        child: //your child
)

Upvotes: 3

Jamminroot

Reputation: 714

Might not be exactly what the OP was looking for, but this page is where I found myself after looking for the problem, so sharing this for everyone with similar issue :)

Stack's fit property did the trick for my needs. Otherwise Image inside (OctoImageIn my case) was padded and providing other Image.fit values did not give any effect.

Stack(
  fit: StackFit.expand, 
  children: [
    Image(
      image: provider,
      fit: BoxFit.cover,
    ),
    // other irrelevent children here
  ]
);

Upvotes: 20

Raj A

Reputation: 592

Visit https://youtu.be/TQ32vqvMR80 OR

For example if parent contrainer has height: 200, then

Container(
            decoration: BoxDecoration(
              image: DecorationImage(
                image: NetworkImage('url'),
                fit: BoxFit.cover,
              ),
            ),
          ),

Upvotes: 4

Quick learner

Reputation: 11477

This worked for me

class _SplashScreenState extends State<SplashScreen> {
  @override
  Widget build(BuildContext context) {
    return Container(
      child: FittedBox(
        child: Image.asset("images/my_image.png"),
        fit: BoxFit.fill,
      ),);
  }
}

Upvotes: 1

sean.boyer

Reputation: 1237

For me, using Image(fit: BoxFit.fill ...) worked when in a bounded container.

Upvotes: 1

E.Bradford

Reputation: 813

None of the above answers worked for me. And since there is no accepted answer, I found the following extended my image from horizontal edge to horizontal edge:

Container ( width: MediaQuery
                    .of(context)
                    .size
                    .width,
                child: 
                  Image.network(my_image_name, fit: BoxFit.fitWidth )
              )

Upvotes: 5

Rémi Rousselet

Reputation: 277757

To make an Image fill its parent, simply wrap it into a FittedBox:

FittedBox(
  child: Image.asset('foo.png'),
  fit: BoxFit.fill,
)

FittedBox here will stretch the image to fill the space. (Note that this functionality used to be provided by BoxFit.fill, but the API has meanwhile changed such that BoxFit no longer provides this functionality. FittedBox should work as a drop-in replacement, no changes need to be made to the constructor arguments.)

Alternatively, for complex decorations you can use a Container instead of an Image – and use decoration/foregroundDecoration fields.

To make the Container will its parent, it should either:

have no child
have alignment property not null

Here's an example that combines two images and a Text in a single Container, while taking 100% width/height of its parent:

Container(
  foregroundDecoration: const BoxDecoration(
    image: DecorationImage(
        image: NetworkImage(
            'https://p6.storage.canalblog.com/69/50/922142/85510911_o.png'),
        fit: BoxFit.fill),
  ),
  decoration: const BoxDecoration(
    image: DecorationImage(
        alignment: Alignment(-.2, 0),
        image: NetworkImage(
            'http://www.naturerights.com/blog/wp-content/uploads/2017/12/Taranaki-NR-post-1170x550.png'),
        fit: BoxFit.cover),
  ),
  alignment: Alignment.bottomCenter,
  padding: EdgeInsets.only(bottom: 20),
  child: Text(
    "Hello World",
    style: Theme.of(context)
        .textTheme
        .display1
        .copyWith(color: Colors.white),
  ),
),

Upvotes: 179

SwiftNinjaPro

Reputation: 851

Your Question contains the first step, but you need width and height. you can get the width and height of the screen. Here is a small edit

//gets the screen width and height
double Width = MediaQuery.of(context).size.width;
double Height = MediaQuery.of(context).size.height;

Widget background = new Image.asset(
  asset.background,
  fit: BoxFit.fill,
  width: Width,
  height: Height,
);

return new Stack(
  children: <Widget>[
    background,
    foreground,
  ],
);

You can also use Width and Height to size other objects based on screen size.

ex: width: Height/2, height: Height/2 //using height for both keeps aspect ratio

Upvotes: 12

Moses

Reputation: 7

Try setting contentPadding

ListTile(
  contentPadding: EdgeInsets.all(0.0),
  ...
)

Upvotes: 0

Jossef Harush Kadouri

Reputation: 34277

The following will fit the image to 100% of container width while the height is constant. For local assets, use AssetImage

Container(
  width: MediaQuery.of(context).size.width,
  height: 100,
  decoration: BoxDecoration(
    image: DecorationImage(
      fit: BoxFit.fill,
      image: NetworkImage("https://picsum.photos/250?image=9"),
    ),
  ),
)

Image fill modes:

Fill - Image is stretched
```
fit: BoxFit.fill
```
Fit Height - image kept proportional while making sure the full height of the image is shown (may overflow)
```
fit: BoxFit.fitHeight
```
Fit Width - image kept proportional while making sure the full width of the image is shown (may overflow)
```
fit: BoxFit.fitWidth
```
Cover - image kept proportional, ensures maximum coverage of the container (may overflow)
```
fit: BoxFit.cover
```
Contain - image kept proportional, minimal as possible, will reduce it's size if needed to display the entire image
```
fit: BoxFit.contain
```

Upvotes: 136

KnightsForce

Reputation: 539

For filling, I sometimes use SizedBox.expand

Upvotes: 3

M_Lude

Reputation: 365

I think that for your purpose Flex could work better than Container():

new Flex(
    direction: Axis.vertical,
    children: <Widget>[
      Image.asset(asset.background)
    ],
   )

Upvotes: 7

Mary

Reputation: 20495

Inside your Stack, you should wrap your background widget in a Positioned.fill.

return new Stack(
  children: <Widget>[
    new Positioned.fill(
      child: background,
    ),
    foreground,
  ],
);

Upvotes: 74

How do I stretch an image to fit the whole background (100% height x 100% width) in Flutter?

Answers (19)

Image fill modes:

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