Option 1 – Using Homebrew

This is the easiest way and will provide automatic updates.

1. Install homebrew
   ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
2. Install adb
   brew cask install android-platform-tools
3. Start using adb
   adb devices

Option 2 – Manually (just the platform tools)

This is the easiest way to get a manual installation of ADB and Fastboot.

1. Delete your old installation (optional)
   rm -rf ~/.android-sdk-macosx/
2. Navigate to https://developer.android.com/studio/releases/platform-tools.html and click on the SDK Platform-Tools for Mac link.
3. Go to your Downloads folder
   cd ~/Downloads/
4. Unzip the tools you downloaded
   unzip platform-tools-latest*.zip
5. Move them somewhere you won’t accidentally delete them
   mkdir ~/.android-sdk-macosx mv platform-tools/ ~/.android-sdk-macosx/platform-tools
6. Add platform-tools to your path
   echo 'export PATH=$PATH:~/.android-sdk-macosx/platform-tools/' >> ~/.bash_profile
7. Refresh your bash profile (or restart your terminal app)
   source ~/.bash_profile
8. Start using adb
   adb devices

Option 3 – If you already have Android Studio installed

1. Add platform-tools to your path
   echo 'export ANDROID_HOME=/Users/$USER/Library/Android/sdk' >> ~/.bash_profile echo 'export PATH=${PATH}:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools' >> ~/.bash_profile
2. Refresh your bash profile (or restart your terminal app)
   source ~/.bash_profile
3. Start using adb
   adb devices

Option 4 – MacPorts

1. Install the Android SDK:
   sudo port install android
2. Run the SDK manager:
   sh /opt/local/share/java/android-sdk-macosx/tools/android
3. Uncheck everything but Android SDK Platform-tools (optional)
4. Install the packages, accepting licenses. Close the SDK Manager.
5. Add platform-tools to your path; in MacPorts, they’re in /opt/local/share/java/android-sdk-macosx/platform-tools. E.g., for bash:
   echo 'export PATH=$PATH:/opt/local/share/java/android-sdk-macosx/platform-tools' >> ~/.bash_profile
6. Refresh your bash profile (or restart your terminal/shell):
   source ~/.bash_profile
7. Start using adb:
   adb devices

Option 5 – Manually (with SDK Manager)

1. Delete your old installation (optional)
   rm -rf ~/.android-sdk-macosx/
2. Download the Mac SDK Tools from the Android developer site under “Get just the command line tools”. Make sure you save them to your Downloads folder.
3. Go to your Downloads folder
   cd ~/Downloads/
4. Unzip the tools you downloaded
   unzip tools_r*-macosx.zip
5. Move them somewhere you won’t accidentally delete them
   mkdir ~/.android-sdk-macosx mv tools/ ~/.android-sdk-macosx/tools
6. Run the SDK Manager
   sh ~/.android-sdk-macosx/tools/android
7. Uncheck everything but Android SDK Platform-tools (optional)

1. Click Install Packages, accept licenses, click Install. Close the SDK Manager window.

1. Add platform-tools to your path
   echo 'export PATH=$PATH:~/.android-sdk-macosx/platform-tools/' >> ~/.bash_profile
2. Refresh your bash profile (or restart your terminal app)
   source ~/.bash_profile
3. Start using adb
   adb devices

Reference: https://stackoverflow.com/questions/17901692/set-up-adb-on-mac-os-x