你必须安装Android SDK命令行工具。 要做到这一点，调用菜单命令File→Settings→Android SDK并下载最新的。

您必须在“设置”窗口左侧选择“Android SDK”。在“外观与行为”→“系统设置”下。

如果颤振医生说的是这样的话

[!] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
• Android SDK at /Users/<admin>/Library/Android/sdk
✗ cmdline-tools component is missing
  Run `path/to/sdkmanager --install "cmdline-tools;latest"`

我的/to/sdkmanager路径是:

/Users/<user>/Library/Android/sdk/tools/bin/sdkmanager

所以对我来说，解决问题的方法就是跑步:

/Users/<user>/Library/Android/sdk/tools/bin/sdkmanager --install "cmdline-tools;latest"

MacOS用户

如果已经安装了android studio，只需运行:

flutter config --android-sdk "/Users/$USER/Library/Android/sdk" & flutter doctor --android-licenses

我在Windows 10上通过以下操作解决了这个问题:

Run the following command in a Windows command prompt or Flutter console: flutter config --android-sdk "C:\Users\'your computer name' AppData\Local\Android\Sdk" (you may need to find and enter your own SDK path) The Android SDK location could be found in the Android Studio application* → Appearance & Behavior → System Settings → Android SDK Open your Android Studio, and then → File → Settings → Appearance & Behavior → System Settings → Android SDK → SDK Tools → download Android SDK Command-line Tools (latest) and you are good to go.

适用于Linux (Ubuntu)

在你的终端复制这个命令，然后用你的用户名(不带空格)修改“你的用户名”:

/home/your user name/Android/Sdk/tools/bin/sdkmanager --install "cmdline-tools;latest"

如果您已经下载了cmdline-tools和Android SDK，请确保Flutter没有在错误的目录中查找:

flutter config --android-sdk=""