这里总结了几篇有用的文章，对于想要快速片段的人，例如插入Dockerfile，下面的脚本对我来说很有用:

RUN mkdir -p /opt/android/cmdline-tools/latest \
    && cd /opt/android/cmdline-tools/latest \
    && wget https://dl.google.com/android/repository/commandlinetools-linux-6858069_latest.zip \
    && bsdtar --strip-components=1 -xvf commandlinetools-linux-6858069_latest.zip \
    && yes | bin/sdkmanager --licenses \
    && bin/sdkmanager "build-tools;29.0.2" "platforms;android-29" \
    && rm commandlinetools-linux-6858069_latest.zip

It just requires bsdtar to be installed (it's usually packaged in popular distributions). Android platform/build tools version 29 are installed, and Android sdk root will be then located in /opt/android. While this setup works for me without warnings as it is, I have an issue when reinstalling packages already installed, or possibly installing different version of the packages: it clashes with packages already present and create bogus directories in the sdk root, with -2, -3 suffixes. These directories are then ignored, and warnings like Observed package id 'emulator' in inconsistent location are printed, so this behavior is definitely not desirable. If you have a fix for that please write it in the comments or, if you are confident enough, just edit the script with the exact fix.

Android Studio在安装命令行工具时是必要的，即使它不是你用来开发应用程序的编辑器。取消选中过时的包选项卡并下载工具就可以了;这应该可以解决许可证问题，你可以回到你最喜欢的IDE(如VS Code)。

混合了Jing Li和caller9的回答，这是我的脚本:

variables:
  ANDROID_COMPILE_SDK: "29"
  ANDROID_BUILD_TOOLS: "29.0.3"
  ANDROID_SDK_TOOLS: "6200805"

before_script:
  - apt-get update --yes
  - apt-get install --yes wget tar unzip lib32stdc++6 lib32z1
  - export ANDROID_HOME=${PWD}android-home
  - install -d $ANDROID_HOME
  - wget --output-document=$ANDROID_HOME/cmdline-tools.zip https://dl.google.com/android/repository/commandlinetools-linux-${ANDROID_SDK_TOOLS}_latest.zip
  - pushd $ANDROID_HOME
  - unzip -d cmdline-tools cmdline-tools.zip
  - popd
  - export PATH=$PATH:${ANDROID_HOME}/cmdline-tools/tools/bin/
  - sdkmanager --version
  - set +o pipefail
  - yes | sdkmanager --sdk_root=${ANDROID_HOME} --licenses
  - set -o pipefail
  - sdkmanager --sdk_root=${ANDROID_HOME} "platforms;android-${ANDROID_COMPILE_SDK}"
  - sdkmanager --sdk_root=${ANDROID_HOME} "platform-tools"
  - sdkmanager --sdk_root=${ANDROID_HOME} "build-tools;${ANDROID_BUILD_TOOLS}"
  - export PATH=$PATH:${ANDROID_HOME}/platform-tools/
  - chmod +x ./gradlew
[...]

由于有新的更新，文档中没有提到一些更改。在解压缩命令行工具包之后，您将得到的最上面的目录是cmdline-tools。将解压缩目录从cmdline-tools重命名为tools，并将其放在$C:/Android/cmdline-tools下

现在它看起来像$C:/Android/cmdline-tools/tools

它会完美地工作。

如果您正在使用Linux，同时又不想让复杂的解决方法弄得乱七八糟，我建议您下载并使用sdkmanager的Snap版本。

记住在终端中使用androidsdk而不是sdkmanager。

使用Android Studio的Ubuntu工作解决方案 下面是Ubuntu和Debian的工作过程:

install Android studio as desribed in their website https://developer.android.com/studio/install run : flutter config --android-studio-dir <location of android studio> then flutter config --android-sdk /home/user/Android/Sdk (this is the default location of the SDK) add the bin to your PATH PATH=$PATH:/home/user/Android/Sdk/tools/bin/ Afterwards, run : flutter doctor --android-licenses and accept all licences To check if everything is ok run the doctor in verbos mode as following : flutter doctor -v