IONIC Build: Failed to find ‘ANDROID_HOME’ environment variable

Running command: 

/demoApp/hooks/after_prepare/010_add_platform_class.js /demoApp
  add to body class: platform-android
  ERROR building one of the platforms: Failed to find ‘ANDROID_HOME’  environment variable. Try setting it manually.
  Failed to find ‘android’ command in your ‘PATH’. Try to update your ‘PATH’ to include a path to valid SDK directory.
You may not have the required environment or OS to build this project
Error: Failed to find ‘ANDROID_HOME’ environment variable. Try setting it manually.
Failed to find ‘android’ command in your ‘PATH’. Try to update your ‘PATH’ to include the path to valid SDK directory.

• First, check whether you have installed Android SDK or not, Install or check to do following steps:
• Download & unzip the correct version of the Android SDK for your operating system.
• Configure the ANDROID_HOME environment variable based on the location of the Android SDK. Additionally, consider adding  ANDROID_HOME/tools, and ANDROID_HOME/platform-tools to your PATH.
• Export the path as follows:

Mac OS X

export ANDROID_HOME=//android-sdk-macosxexport PATH=${PATH}:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools

Linux

export ANDROID_HOME=//android-sdk-linuxexport PATH=${PATH}:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools

Windows

set ANDROID_HOME=C:android-sdk-windowsset PATH=%PATH%;%ANDROID_HOME%tools;%ANDROID_HOME%platform-tools