UPDATE

最新版本引入了 sdkmanager，这是一个命令行工具，可让您查看、安装、更新和卸载 Android SDK 的软件包.

UPDATE

Latest versions introduce sdkmanager, a command line tool that allows you to view, install, update, and uninstall packages for the Android SDK.

sdkmanager 工具在 Android SDK 工具包(25.2.3 及更高版本)中提供，位于 android_sdk/tools/bin/代码>.

The sdkmanager tool is provided in the Android SDK Tools package (25.2.3 and higher) and is located in android_sdk/tools/bin/.

  sdkmanager [--uninstall] [<common args>] [--package_file <file>] [<packages>...]
  sdkmanager --update [<common args>]
  sdkmanager --list [<common args>]
  sdkmanager --licenses [<common args>]

In its first form, installs, or uninstalls, or updates packages.
    By default, the listed packages are installed or (if already installed)
    updated to the latest version.

    --uninstall: uninstalled listed 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), all installed packages are
    updated to the latest version.

In its third form, all installed and available packages are printed
    out.

In its fourth form (with --licenses), show and offer the option to
     accept licenses for all available packages that have not already been
     accepted.

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.

所以，更新包运行

$ sdkmanager --update

接受许可

$ yes | sdkmanager --licenses

旧答案

(请注意:不推荐使用 android 命令！)

您可能离自动化越近:

$ android update sdk --no-ui

android 为自动更新提供以下选项:

android provide these options for automatic updates:

Action "update sdk":
  Updates the SDK by suggesting new platforms to install if available.
Options:
  -f --force    Forces replacement of a package or its parts, even if something has been modified
  -u --no-ui    Updates from command-line (does not display the GUI)
  -o --obsolete Installs obsolete packages
  -t --filter   A filter that limits the update to the specified types of packages in the form of
                a comma-separated list of [platform, tool, platform-tool, doc, sample, extra]
  -s --no-https Uses HTTP instead of HTTPS (the default) for downloads
  -n --dry-mode Simulates the update but does not download or install anything

如果要列出可以安装的软件包，可以使用

If you want to list which packages are available for installation you can use

$ android list sdk

你会得到一个包的有序列表，例如

and you'll obtain an ordered list of packages, for example

Packages available for installation or update: 9
   1- ARM EABI v7a System Image, Android API 15, revision 2
   2- Intel x86 Atom System Image, Android API 15, revision 1
   3- Android Support, revision 8
   4- Google AdMob Ads SDK, revision 6
   5- Google Analytics SDK, revision 2
   6- Google Play APK Expansion Library, revision 1
   7- Google Play Billing Library, revision 2
   8- Google Play Licensing Library, revision 2
   9- Google Web Driver, revision 2

如果您使用 --filter 选项，您也可以将更新限制为仅对所需组件进行更新

Also you can limit the update only to a desired component if you use the --filter option

$ android update sdk --filter <component> --no-ui

其中组件是一个或多个

• android list sdk 返回的数字(即1，也称为包索引)
• 附加组件
• 文档
• 额外的
• 平台
• 平台工具
• 示例
• 来源
• 系统映像
• 工具

• the numbers returned by android list sdk (i.e. 1, also know as package index)
• add-on
• doc
• extra
• platform
• platform-tool
• sample
• source
• system-image
• tool

或者可以是一个或多个特定标识符.例如，如果您只想下载一小组特定的软件包，您可以这样做:

or can be one or more specific identifiers. For instance, if you just want to download a small set of specific packages, you could do this:

$ android update sdk -u --filter platform-tools,android-16,extra-android-support

您将获得平台工具、API 级别 16 和支持包 jar.如果您仅构建构建机器并且必须为下载您永远不会使用的所有额外内容付费，这真的很方便.

and you'll just get the platform tools, api level 16 and support package jar. This is really handy if you're building a build machine only and would have to pay for downloading all the extra stuff that you'll never use.

要查看可用选项，您可以使用 --help，例如

To see the available options you can use --help, for example

$ android --help list sdk

       Usage:
       android [global options] list sdk [action options]
       Global options:
  -h --help       : Help on a specific command.
  -v --verbose    : Verbose mode, shows errors, warnings and all messages.
     --clear-cache: Clear the SDK Manager repository manifest cache.
  -s --silent     : Silent mode, shows errors only.

                   Action "list sdk":
  Lists remote SDK repository.
Options:
  -o --obsolete  : Deprecated. Please use --all instead.
  -a --all       : Lists all available packages (including obsolete and
                   installed ones)
     --proxy-host: HTTP/HTTPS proxy host (overrides settings if defined)
     --proxy-port: HTTP/HTTPS proxy port (overrides settings if defined)
  -s --no-https  : Uses HTTP instead of HTTPS (the default) for downloads.
  -e --extended  : Displays extended details on each package
  -u --no-ui     : Displays list result on console (no GUI) [Default: true]