Step-1
Start up Terminal and go to your home folder.
cd ~/
Step-2
Open and edit .bash_profile file
 open -e .bash_profile
 If you don’t have .bash_profile file in your computer path, then create one
 touch .bash_profile
 Step-3
Save the below line
export ANDROID_HOME={YourPath}
export PATH=$PATH:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools
 Step-4
Refresh the file using below command
source .bash_profile
Check Configured.
echo ANDROID_HOME