我不确定我是否理解你的问题，但如果你想让图像填充整个屏幕，你可以使用一个适合BoxFit.cover的DecorationImage。

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 */,
      ),
    );
  }
}

对于你的第二个问题，这里有一个关于如何将依赖分辨率的资产图像嵌入到应用程序中的文档链接。

根据您的需求，可以采用以下两种方式:

背景图像跨越应用程序栏

  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 >

      ),
    ));

背景图像没有跨越应用程序栏

   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 >

      ),
    ));

额外的:

要只向appBar添加背景图像，请参考此答案

其他答案都很棒。这是另一种方法。

这里我使用sizebox .expand()来填充可用空间，并将严格的约束传递给它的子代(Container)。 BoxFit。cover enum缩放图像并覆盖整个屏幕

 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
            ),
          ),
        ),
      ),
    );
  }

我知道这个问题已经有很多答案了，但是这个解决方案在背景图像周围有一个颜色梯度，我想你会喜欢的

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),
          ),
        ),
      ),
    );
  }
}

    @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: 
        [
          //
        ],
      ),
    )));
  }

截图:

代码:

@override
Widget build(BuildContext context) {
  return DecoratedBox(
    decoration: BoxDecoration(
      image: DecorationImage(image: AssetImage("your_asset"), fit: BoxFit.cover),
    ),
    child: Center(child: FlutterLogo(size: 300)),
  );
}