Android SDK 缺少命令行工具

我已经安装了flutter但当我跑步时flutter doctor为了验证安装，我得到：-

Android SDK is missing command line tools

我已经仔细检查了命令行是否已安装。

我需要做什么才能消除此错误？

我已经包含了完整的flutter doctor -v输出如下：-

$ flutter doctor -v
    [✓] Flutter (Channel beta, v0.3.1, on Mac OS X 10.13.4 17E202, locale en-AU)
        • Flutter version 0.3.1 at /Users/chris/flutter
        • Framework revision 12bbaba9ae (2 weeks ago), 2018-04-19 23:36:15 -0700
        • Engine revision 09d05a3891
        • Dart version 2.0.0-dev.48.0.flutter-fe606f890b

[!] Android toolchain - develop for Android devices
    • Android SDK at /usr/local/Caskroom/android-platform-tools/27.0.1
    • Android NDK location not configured (optional; useful for native profiling support)
    • ANDROID_HOME = /usr/local/Caskroom/android-sdk/3859397
    ✗ Android SDK is missing command line tools;
    • Try re-installing or updating your Android SDK,
      visit https://flutter.io/setup/#android-setup for detailed instructions.

[✓] iOS toolchain - develop for iOS devices (Xcode 9.3)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 9.3, Build version 9E145
    • ios-deploy 1.9.2
    • CocoaPods version 1.5.0

[✓] Android Studio (version 3.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 24.1.1
    • Dart plugin version 173.4700
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)

[✓] IntelliJ IDEA Ultimate Edition (version 2018.1.2)
    • IntelliJ at /Applications/IntelliJ IDEA.app
    • Flutter plugin version 24.1.2
    • Dart plugin version 181.4668.60

[!] Connected devices
    ! No devices available

! Doctor found issues in 2 categories.

在 Android Studio 上打开 SDK 管理器。

转到 SDK 工具选项卡。

检查Android SDK命令行工具是否被选中。如果没有，请检查并应用更改。

由于某种原因，更新 flutter 和 Android Studio 后，我也遇到了这个错误。似乎有一些新的要求由于某种原因没有自动安装。

这为我解决了这个问题。