For easy install of the Android tools, we are going to use Homebrew. Homebrew is a package manager for the Mac that will make your life awesome if you need to install software from source. Installation is easily done by copy-pasting the following line in your terminal.
ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"
If the installation is sucessful, you should now be able to run the following command to install the Android tools.
brew install android-sdk