[Mac OS] [Android SDK] [Ionic] [How to Fix] ionic platform add android - ANDROID_HOME is not set and "android" command not in your PATH.

1. Download Android SDK & Unzip it
2. Setup Environment Path
• Open terminal, run 'vi ~/.bash_profile'
• Add the following lines in that file
• export ANDROID_HOME=/Users/Ian/Documents/Dev/android-sdk-macosx
• export PATH=${PATH}:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools
• Save & Exit
• Run 'source ~/.bash_profile'
3. Make sure you have the write permission for the sdk folder.
• Run 'chmod -R 777 <Your sdk path> 
• (e.g. chmod -R 777 /Users/xxx/Development/android_sdk_mac).
• This is really important. I have spent a lot of time figuring this out. If you don't have the write permission, ionic will always throw 'ANDROID_HOME is not set and "android" command not in your PATH' error even if you have correctly set up all the environment variables and path.