更改图像大小以在 flutter gridview 中获取整个单元格

如何解决更改图像大小以在 flutter gridview 中获取整个单元格

我是 Flutter 的新手，我在 Flutter 中使用 gridview 来创建棋盘 (7x7) 游戏。我在一些单元格中有图像，这些图像随着播放的移动而变化。我希望图像与单元格大小相同，而不是更小。该图像是方形图像，应与单元格大小相同。如何实现这一目标？

这是我当前的代码：

main class:

import 'package:Flutter/material.dart';
import 'BoardField.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "Flutter run". You'll see the
        // application has a blue toolbar. Then,without quitting the app,try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "Flutter run",// or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,),home: MyHomePage(title: 'Flutter Demo Home Page'),);
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key,required this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful,meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final List<List<int>> gridState = [
    [1,2],[0,-1,0],[2,1]
  ];

  int selectedindex = -1;

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called,for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast,so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method,and use it to set our appbar title.
        title: Text(widget.title),body: Container(
          child: GridView.count(
        physics: NeverScrollableScrollPhysics(),childAspectRatio: 1,crossAxisCount: 7,children: List.generate(49,(index) {
          return BoardField(
            gridState: gridState,index: index,onButtonpressed: () {
              setState(() {
                int x = (index / gridState.first.length).floor();
                int y = (index % gridState.first.length);
                if (gridState[x][y] == 1 || gridState[x][y] == 2) {
                  if (selectedindex != -1) {
                    gridState[(selectedindex / gridState.first.length).floor()]
                        [(selectedindex % gridState.first.length)] -= 2;
                  }
                  selectedindex = index;
                  gridState[x][y] += 2;
                }
              });
            },);
        }),)),);
  }
}

Second Class:

import 'package:Flutter/material.dart';

class BoardField extends StatelessWidget {
  BoardField(
      {Key? key,required this.gridState,required this.index,required this.onButtonpressed})
      : super(key: key);

  final List<List<int>> gridState;
  final int index;
  final VoidCallback onButtonpressed;

  @override
  Widget build(BuildContext context) {
    int x,y = 0;
    x = (index / gridState.first.length).floor();
    y = (index % gridState.first.length);
    bool dark = gridState[x][y] == -1;

    return Container(
      decoration: Boxdecoration(
          border: Border.all(color: Colors.black,width: 0.5),color: dark ? Colors.black : Colors.white),child: Center(
        child: BoardItem(
          gridState: gridState,itemIdentifier: gridState[x][y],onButtonpressed: onButtonpressed,);
  }
}

class BoardItem extends StatelessWidget {
  BoardItem(
      {Key? key,required this.itemIdentifier,required this.onButtonpressed})
      : super(key: key);

  final List<List<int>> gridState;
  final int itemIdentifier;
  final VoidCallback onButtonpressed;

  @override
  Widget build(BuildContext context) {
    switch (itemIdentifier) {
      case 1:
        return TextButton(
            onpressed: onButtonpressed,child: Image.asset(
              'images/Red Sphere.jpg',));

      case 2:
        return TextButton(
            onpressed: onButtonpressed,child: Image.asset(
              'images/Blue Sphere.jpg',));

      case 3:
        return TextButton(
            onpressed: () {},child: Image.asset(
              'images/Red Sphere_highlight.jpg',));

      case 4:
        return TextButton(
            onpressed: () {},child: Image.asset(
              'images/Blue Sphere_highlight.jpg',));

      default:
        return Container(width: 0.0,height: 0.0);
    }
  }
}

谢谢。