Flutter代码无红色标记但编译报错：找不到HomeBanner构造函数

我用Flutter开发了两个页面，文件名为HomeBanner和home_screen。代码里没有红色标记，但编译时提示找不到HomeBanner构造函数，相关代码和报错信息如下：

HomeBanner文件代码 #

import 'package:flutter/material.dart';
import 'package:my_portfolio/constants.dart';

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

  @override
  Widget build(BuildContext context) {
    return AspectRatio(
      aspectRatio: 3,
      child: Stack(
        fit: StackFit.expand,
        children: [
          Image.asset(
            "/home/isha/Desktop/flutter_app/my_portfolio/assets/background.jpg",
            fit: BoxFit.cover,
          ),
          Container(
            color: darkColor.withOpacity(0.66),
          ),
          Padding(
            padding: const EdgeInsets.symmetric(horizontal: defaultPadding),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Text(
                  "Discover about my space!",
                  style: Theme.of(context).textTheme.headline3!.copyWith(
                        fontWeight: FontWeight.bold,
                        color: Colors.white,
                      ),
                ),
                MyApps(),
              ],
            ),
          ),
        ],
      ),
    );
  }
}

home_screen文件代码 #

import 'package:flutter/material.dart';
import 'package:my_portfolio/screens/home/HomeBanner.dart';
//import 'package:my_portfolio/constants.dart';
import 'package:my_portfolio/screens/main_screen.dart';

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

  @override
  Widget build(BuildContext context) {
    return MainScreen(
      children: [
        const HomeBanner(),
        Text(
          "My Projects",
          style: Theme.of(context).textTheme.headlineSmall,
        ),
        // GridView.builder(
        //     shrinkWrap: true,
        //     itemCount: 9,
        //     gridDelegate:
        //         SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 3),
        //     itemBuilder: (context, index) => Container(
        //           color: Colors.blueGrey,
        //         )),
      ],
    );
  }
}

报错信息 #

Waiting for connection from debug service on Chrome...              
lib/screens/home/home_screen.dart:13:15: Error: Couldn't find constructor 'HomeBanner'.
        const HomeBanner(),
              ^^^^^^^^^^
Waiting for connection from debug service on Chrome...             42.1s
Failed to compile application.

解决方案 #

• 检查文件名大小写匹配：Linux/macOS环境下Flutter对文件名大小写敏感，确保HomeBanner.dart的实际文件名和导入路径中的大小写完全一致，比如不要出现实际文件是home_banner.dart或homebanner.dart但导入时写HomeBanner.dart的情况。
• 验证导入路径正确性：确认home_screen.dart中的导入语句package:my_portfolio/screens/home/HomeBanner.dart指向的路径确实存在该文件，检查目录层级和文件名拼写。
• 清理缓存重新编译：执行以下命令清理项目缓存后重新构建：

  flutter clean
  flutter pub get
  flutter run
  

• 确认类的可访问性：检查HomeBanner类和构造函数没有被私有修饰符（下划线）限制，当前代码中的构造函数是公开的，这部分没问题。

内容的提问来源于stack exchange，提问作者whizzx