添加第三方包时Flutter包配置错误

Question

在 Flutter 中安装任何第三方包并尝试运行我的代码时，总是出现错误，在构建 gradle 文件中找不到命名空间

举个例子，这个

A problem occurred configuring project ':google_mlkit_commons'.
> Could not create an instance of type com.android.build.api.variant.impl.LibraryVariantBuilderImpl.
   > Namespace not specified. Please specify a namespace in the module's build.gradle file like so:

     android {
         namespace 'com.example.namespace'
     }

     If the package attribute is specified in the source AndroidManifest.xml, it can be migrated automatically to the namespace value in the build.gradle file using the AGP Upgrade Assistant; please refer to https://developer.android.com/studio/build/agp-upgrade-assistant for more information.

所以要解决这个问题，我应该转到提到的包，例如这里是

':google_mlkit_commons'

，然后扔掉它的android文件并获取构建gradle，然后在我们的示例的android标签中添加它的命名空间

android {
    namespace "com.google_mlkit_text_recognition"
    compileSdkVersion 31
    ....
}

我的问题是 1-我应该为我想要使用的每个包执行此步骤吗？ 2-为什么现在会出现此错误？和新的flutter版本有关系吗？

扑医生-v

[√] Flutter (Channel stable, 3.16.5, on Microsoft Windows [Version 10.0.19045.3930], locale en-US)
    • Flutter version 3.16.5 on channel stable at C:\Users\engma\flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 78666c8dc5 (4 weeks ago), 2023-12-19 16:14:14 -0800
    • Engine revision 3f3e560236
    • Dart version 3.2.3
    • DevTools version 2.28.4

[√] Windows Version (Installed version of Windows is version 10 or higher)

[√] Android toolchain - develop for Android devices (Android SDK version 34.0.0) 
    • Android SDK at C:\Users\engma\AppData\Local\Android\sdk
    • Platform android-34, build-tools 34.0.0
    • Java binary at: C:\Program Files\Android\Android Studio\jbr\bin\java       
    • Java version OpenJDK Runtime Environment (build 17.0.7+0-b2043.56-10550314)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[X] Visual Studio - develop Windows apps
    X Visual Studio not installed; this is necessary to develop Windows apps.
      Download at https://visualstudio.microsoft.com/downloads/.
      Please install the "Desktop development with C++" workload, including all of its default components

[√] Android Studio (version 2023.1)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.7+0-b2043.56-10550314)

[√] VS Code (version 1.85.1)
    • VS Code at C:\Users\engma\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.80.0

[√] Connected device (4 available)
    • DRA LX2 (mobile)  • 5LX9K18817915788 • android-arm64  • Android 8.1.0 (API 27)
    • Windows (desktop) • windows          • windows-x64    • Microsoft Windows [Version 10.0.19045.3930]
    • Chrome (web)      • chrome           • web-javascript • Google Chrome 120.0.6099.217
    • Edge (web)        • edge             • web-javascript • Microsoft Edge 120.0.2210.133

[√] Network resources
    • All expected network resources are available.

! Doctor found issues in 1 category.

Answer 1

这是什么意思？

在较新版本的 Android Gradle 插件和 Gradle 中，

namespace

从

AndroidManifest.xml

转移到

app/build.gradle

。一般来说，这意味着以下内容：

在所有三个 AndroidManifest.xml 文件（main、debug、profile）中，删除

package

属性：

<!-- This is how it should look like: -->

<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- YOUR CONTENT HERE -->
</manifest>

在

app/build.gradle

中，添加以下行：

android {
    namespace "com.example.yourpackage"
    ...
}

但是，这需要项目中的所有模块添加

namespace

。您的 package 似乎还没有此属性。

如何修复这个错误？

1. 按照thisSO答案
中所述全局定义名称空间
2. （推荐）降级Gradle并等待你的包迁移到新版本