brew tap caskroom/versions
brew cask install android-platform-tools
直接下载：
只是我被墙了。f。
alices-iMac:~ alice$ brew install android-platform-tools
Error: No available formula with the name "android-platform-tools"
It was migrated from homebrew/core to caskroom/cask.
You can access it again by running:
brew tap caskroom/cask
alices-iMac:~ alice$ brew tap caskroom/cask
==> Tapping caskroom/cask
Cloning into '/usr/local/Homebrew/Library/Taps/caskroom/homebrew-cask'...
remote: Counting objects: 3993, done.
remote: Compressing objects: 100% (3970/3970), done.
remote: Total 3993 (delta 36), reused 486 (delta 19), pack-reused 0
Receiving objects: 100% (3993/3993), 1.36 MiB | 43.00 KiB/s, done.
Resolving deltas: 100% (36/36), done.
Checking out files: 100% (3978/3978), done.
Tapped 0 formulae (4,002 files, 4.3MB)
alices-iMac:~ alice$ brew cask install android-platform-tools
==> Creating Caskroom at /usr/local/Caskroom
==> Satisfying dependencies
brew主要用来下载一些不带界面的命令行下的工具和第三方库来进行二次开发
brew cask主要用来下载一些带界面的应用软件，下载好后会自动安装，并能在mac中直接运行使用
举个例子，
brew install curl可以安装curl第三方库，这样你在开发时就可以使用它的库来进行开发
brew cask install chrome可以安装谷歌浏览器应用程序，可直接运行
作者：Cloud Strife