java - 升级 gradle 时，Flutter 项目无法构建。错误 : Type 'FlutterTask' property 'assets' is missing an input or output annotation

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当我尝试在 USB 设备上构建我的应用程序时，构建崩溃并显示此日志输出

FAILURE: Build failed with an exception.

• What went wrong: Some problems were found with the configuration of task ':app:compileFlutterBuildDebug' (type 'FlutterTask').

  • Type 'FlutterTask' property 'assets' is missing an input or output annotation.

    Reason: A property without annotation isn't considered during up-to-date checking.

    Possible solutions:

    1. Add an input or output annotation.
    2. Mark it as @Internal.

    Please refer to https://docs.gradle.org/7.0/userguide/validation_problems.html#missing_annotation for more details about this problem.

  • Type 'FlutterTask' property 'assetsDirectory' is missing an input or output annotation.

    Reason: A property without annotation isn't considered during up-to-date checking.

    Possible solutions:

    1. Add an input or output annotation.
    2. Mark it as @Internal.

    Please refer to https://docs.gradle.org/7.0/userguide/validation_problems.html#missing_annotation for more details about this problem.

  • Type 'FlutterTask' property 'buildMode' is missing an input or output annotation.

    Reason: A property without annotation isn't considered during up-to-date checking.

    Possible solutions:

    1. Add an input or output annotation.
    2. Mark it as @Internal.

    Please refer to https://docs.gradle.org/7.0/userguide/validation_problems.html#missing_annotation for more details about this problem.

  • Type 'FlutterTask' property 'fastStart' doesn't have a configured value.

    Reason: This property isn't marked as optional and no value has been configured.

    Possible solutions:

    1. Assign a value to 'fastStart'.
    2. Mark property 'fastStart' as optional.

    Please refer to https://docs.gradle.org/7.0/userguide/validation_problems.html#value_not_set for more details about this problem.

  • Type 'FlutterTask' property 'flutterExecutable' is missing an input or output annotation.

    Reason: A property without annotation isn't considered during up-to-date checking.

    Possible solutions:

    1. Add an input or output annotation.
    2. Mark it as @Internal.

    Please refer to https://docs.gradle.org/7.0/userguide/validation_problems.html#missing_annotation for more details about this problem.

• Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 1s Exception: Gradle task assembleDebug failed with exit code 1

请帮助找到解决此问题的方法

Answer 1

发生这种情况是因为您将项目中的 gradle 更新为 gradle 7。并且 gradle 7 有一些新的注释属性，必须进行审查。
我也遇到了这个问题，并在 github 上提出了一个问题。
This is the link
所以你的选择

降级你的 gradle( < 7 )

按照 this 中的说明进行更改公关。

在引用的页面(Pull Req)中。有一段名为 Files Changed .看到那边的绿色线条。只需编辑您的 gradle文件和添加/编辑与绿色线条相同。