如何使 flutter 卡根据内容自动调整其高度

Question

In the project, I'm using images and text inside the flutter card, but the card returns a fixed height. and then I also tried just using a card with an empty value, but it still returns a fixed height. what should I do to make the height of the card auto adjust with content?

    @override
    Widget build(BuildContext context) {
    final title = 'Food Recipes';
    return MaterialApp(
      title: title,
      home: Scaffold(
        appBar: AppBar(
          title: Text(title),
        ),
        body: GridView.builder(
            itemCount: _listViewData.length,
            gridDelegate:
                SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
            itemBuilder: (context, index) {
              return Card(
                margin: const EdgeInsets.all(10.0),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    AspectRatio(
                      aspectRatio: 18.0 / 13.0,
                      child: Image.network(
                        _listViewDataImage[index],
                        fit: BoxFit.fill,
                      ),
                    ),
                    Padding(
                      padding: EdgeInsets.fromLTRB(16.0, 12.0, 16.0, 8.0),
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                            _listViewData[index],
                            textAlign: TextAlign.center,
                          ),
                        ],
                      ),
                    ),
                  ],
                ),
              );
            }),
      ),
    );
  }

Answer 1

You want to wrap your card in a Column because the inner Column take full height

 Column(children: <Widget>[
      Card(
        margin: const EdgeInsets.all(10.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            AspectRatio(
              aspectRatio: 18.0 / 13.0,
              child: Image.network(
               "https://picsum.photos/200",
                fit: BoxFit.fill,
              ),
            ),
            Padding(
              padding: EdgeInsets.fromLTRB(16.0, 12.0, 16.0, 8.0),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    "Just add your desired image size (width & height) after our URL, and you'll get a random image.",
                    textAlign: TextAlign.center,
                  ),
                ],
              ),
            ),
          ],
        ),
      )
])

Answer 2

The problem comes from SliverGridDelegateWithFixedCrossAxisCount :

Creates grid layouts with a fixed number of tiles in the cross axis
This delegate creates grids with and spaced tiles.

I recommend you to use flutter_staggered_grid_view: and to give up to AspectRatio widget. More about tiles here .

body: StaggeredGridView.countBuilder(
   crossAxisCount: 2,
   itemCount: 6,
   itemBuilder: (BuildContext context, int index) => 
     Card(
       margin: const EdgeInsets.all(10.0),
       child: Container(
         child: Column(
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
            Image.network('https://upload.wikimedia.org/wikipedia/commons/6/66/An_up-close_picture_of_a_curious_male_domestic_shorthair_tabby_cat.jpg',
              fit: BoxFit.fill,
            ),
            Padding(
              padding: EdgeInsets.fromLTRB(16.0, 12.0, 16.0, 8.0),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text("Cat",textAlign: TextAlign.center),
                ],
            ),
         )],
       ),
     )
   ),
   staggeredTileBuilder: (int index) =>
     StaggeredTile.fit(1),
)

Answer 3

Try flutter_staggered_grid_view package.

In the pubspec.yaml, add the following dependency:

dependencies:
  flutter_staggered_grid_view: any

In your library, add the following import:

import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';

Example:

  StaggeredGridView.countBuilder(
  crossAxisCount: 4,
  itemCount: 8,
  itemBuilder: (BuildContext context, int index) => new Container(
      color: Colors.green,
      child: new Center(
        child: new CircleAvatar(
          backgroundColor: Colors.white,
          child: new Text('$index'),
        ),
      )),
  staggeredTileBuilder: (int index) =>
      new StaggeredTile.count(2, index.isEven ? 2 : 1),
  mainAxisSpacing: 4.0,
  crossAxisSpacing: 4.0,
),

Use it like GridView

Output:

---

Constructors :

The StaggeredGridView follow the same constructors convention than the GridView . There are two more constructors: countBuilder and extentBuilder . These constructors allow you to define a builder for the layout and a builder for the children.

Tiles :

A StaggeredGridView needs to know how to display each tile, and what widget is associated with a tile.

A tile needs to have a fixed number of cell to occupy in the cross axis. For the extent in the main axis you have 03 options :

1. You want a fixed number of cells => use StaggeredTile.count .
2. You want a fixed extent => use StaggeredTile.extent .
3. You want a variable extent, defined by the content of the tile itself => use StaggeredTile.fit .