flutter 启动报错

Question

请问下，老师,flutter启动直接报错 Operand of null-aware operation ‘!’ has type ‘WidgetsBinding’ which excludes null.
…/…/src/smart_refresher.dart:513

请指点下，谢谢了

Answer 1

CrazyCodeBoy 2022-03-25 20:21:47

你新创建一个项目运行也是这个问题吗，如果是的话可以将flutter版本回退到2.10稳定版看看呢

Answer 2

CrazyCodeBoy 2022-03-25 12:25:01

这是运行的那一节的代码呢，另外flutter doctor检查下环境的截图发我帮你看看哈

• 提问者 精慕门8879228 #1

  flutter --version
  Flutter 2.13.0-0.0.pre.59 • channel master • https://github.com/flutter/flutter.git
  Framework • revision 57aa49028d (2 weeks ago) • 2022-03-09 16:01:03 -0800
  Engine • revision 2c1816b391
  Tools • Dart 2.17.0 (build 2.17.0-182.0.dev) • DevTools 2.11.1
  
  
  
  flutter doctor
  Doctor summary (to see all details, run flutter doctor -v):
  [✓] Flutter (Channel master, 2.13.0-0.0.pre.59, on macOS 12.2 21D49 darwin-arm, locale zh-Hans-CN)
  [✓] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
  [✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
  [✗] Chrome - develop for the web (Cannot find Chrome executable at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome)
      ! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.
  [✓] Android Studio (version 2021.1)
  [✓] VS Code (version 1.65.2)
  [✓] Connected device (1 available)
  [✓] HTTP Host Availability
  
  ! Doctor found issues in 1 category.

• 提问者 精慕门8879228 #2

  我就是直接启动app就报错了

• 提问者 精慕门8879228 #3

  Future<void> main() async {
    await Global.init();
    runApp(const MyApp());
    SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle.dark); //显示出手机状态栏
  }
  
  class MyApp extends StatelessWidget {
    const MyApp({Key? key}) : super(key: key);
    // This widget is the root of your application.
    @override
    Widget build(BuildContext context) {
      return ScreenUtilInit(
        minTextAdapt: true,
        splitScreenMode: true,
        designSize: const Size(375, 1040),
        builder: () => RefreshConfiguration(
          headerBuilder: () => const ClassicHeader(
            refreshingText: '获取新的数据',
          ),
          footerBuilder: () => const ClassicFooter(
            noDataText: '我是有底线',
          ),
          hideFooterWhenNotFull: true,
          headerTriggerDistance: 80,
          maxOverScrollExtent: 100,
          footerTriggerDistance: 50,
          child: