错误：未知参数 --licenses flutter doctor --android-licenses

Question

我尝试用vscode安装android SDK来编写flutter。 但是每当启动 android 模拟器时，它都会要求许可证。 但是每当我使用命令 flutter doctor android 许可证时。 它给了我这个错误。 我在用，

ANDROID SDK 平台工具 - 29.0.6
ANDROID SDK 构建工具 - 29.0.3
ANDROID 7 (API:24)

flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 1.22.1, on Linux, locale en_US.utf8)
[!] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/linux#android-setup for more details.
[!] Android Studio (not installed)
[✓] VS Code (version 1.50.0)
[!] Connected device
    ! No devices available

! Doctor found issues in 3 categories.

我尝试了许多 StackOverflow 解决方案，但没有奏效。 也许过时了。

 flutter doctor --android-licenses
Error: Unknown argument --licenses
Usage: 
  sdkmanager [--uninstall] [<common args>] \
    [--package_file <package-file>] [<packages>...]
  sdkmanager --update [<common args>]
  sdkmanager --list [<common args>]

In its first form, installs, or uninstalls, or updates packages.
    <package> is a sdk-style path (e.g. "build-tools;23.0.0" or 
             "platforms;android-23").
    <package-file> is a text file where each line is a sdk-style path
                   of a package to install or uninstall.
    Multiple --package_file arguments may be specified in combination
     with explicit paths.
In its second form (with --update), currently installed packages are
    updated to the latest version.
In its third form, all installed and available packages are printed out.

Common Arguments:
    --sdk_root=<sdkRootPath>: Use the specified SDK root instead of the SDK containing this tool
    --channel=<channelId>: Include packages in channels up to <channelId>.
                           Common channels are:
                           0 (Stable), 1 (Beta), 2 (Dev), and 3 (Canary).

    --include_obsolete: With --list, show obsolete packages in the
                        package listing. With --update, update obsolete                                                                                                                                          
                        packages as well as non-obsolete.                                                                                                                                                        
    --no_https: Force all connections to use http rather than https.                                                                                                                                             
    --proxy=<http | socks>: Connect via a proxy of the given type.                                                                                                                                               
    --proxy_host=<IP or DNS address>: IP or DNS address of the proxy to use.                                                                                                                                     
    --proxy_port=<port #>: Proxy port to connect to.                                                                                                                                                             
                                                                                                                                                                                                                 
* If the env var REPO_OS_OVERRIDE is set to "windows",                                                                                                                                                           
  "macosx", or "linux", packages will be downloaded for that OS.   

那么如何激活android SDK的许可证呢？

Answer 1

我在运行flutter doctor --android-licenses时遇到了同样的问题。 我在没有使用 Android Studio 的情况下安装了 android SDK。

以下是我为使其工作而采取的步骤

1. 我去了android studio下载页面并向下滚动并下载了我的操作系统（windows）的命令行工具
2. 然后我解压到android-sdk目录下
3. 我创建了一个名为新文件夹， latest内部cmdline-tools和移动的内容cmdline-tools吧。

在此之后，我尝试运行flutter doctor --android-licenses然后它没有错误地工作并且在我的设备上运行它没问题。

Answer 2

如果<sdk>/cmdline-tools\\latest目录中没有命令行工具，则会出现此问题。 您可以从这里下载命令行工具，而不是安装 Android Studio，并将其放在目录<sdk>/cmdline-tools\\latest

Answer 3

安装 Android SDK 6.0(Marshmallow)

Answer 4

我通过安装 android studio 并卸载所有 android 文件并从 android studio 重新安装来解决它。 然后自动在文件夹中创建许可证。 现在每当我从 vscode 运行模拟器时..它运行顺利。

我遇到了这个问题，因为我直接从 android sdk 安装了所有 android 文件。 我通过 sudo snap android-sdk 安装了 android sdk。 所以它给我带来了问题。 要了解更多详细信息，您可以阅读本文 - Linux 完整指南上的 Flutter、Android SDK 和 VScode 设置