升级Flutter 3.16后无法构建Android/iOS包，遇空安全类型错误

问题现象 #

升级Flutter 3.16后执行assembleDebug任务时失败，核心错误为第三方库中bool?类型无法赋值给bool类型，具体错误日志：

Running Gradle task 'assembleDebug'...
../../.pub-cache/hosted/pub.dev/enough_platform_widgets-0.7.4/lib/src/platform/decorated_platform_textfield.dart:536:20: Error: The argument type 'bool?' can't be assigned to the parameter type 'bool' because 'bool?' is nullable and 'bool' isn't.
          enabled: enabled,
                   ^
../../.pub-cache/hosted/pub.dev/flutter_platform_widgets-3.3.5/lib/src/platform_text_field.dart:578:30: Error: The argument type 'bool?' can't be assigned to the parameter type 'bool' because 'bool?' is nullable and 'bool' isn't.
      enabled: data?.enabled ?? enabled,
                             ^
Target kernel_snapshot failed: Exception


FAILURE: Build failed with an exception.

* Where:
Script '/flutter/packages/flutter_tools/gradle/src/main/groovy/flutter.groovy' line: 1350

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command '/flutter/bin/flutter'' finished with non-zero exit value 1

解决方案 #

1. 升级涉事第三方库 #

报错的enough_platform_widgets（0.7.4）和flutter_platform_widgets（3.3.5）版本未适配Flutter 3.16的空安全检查：

• 打开项目根目录的pubspec.yaml文件，找到这两个依赖项，将版本号更新为最新稳定版
• 执行命令更新依赖：

flutter pub upgrade

2. 临时本地修复（若库未更新兼容版本） #

如果第三方库尚未发布适配版本，可临时修改缓存中的源码：

• 定位到报错文件：
  • enough_platform_widgets：修改第536行的enabled: enabled,为enabled: enabled ?? true,（根据业务逻辑设置默认值，true或false均可）
  • flutter_platform_widgets：修改第578行的enabled: data?.enabled ?? enabled,为enabled: data?.enabled ?? enabled ?? true,，确保最终传入非空布尔值

3. 清理缓存重新构建 #

执行以下命令清理缓存并重新构建项目：

flutter clean
flutter pub get
flutter run

内容的提问来源于stack exchange，提问作者user4950345