My .bash_profile looks like this
export PATH=$PATH:/Users/subbarao/Library/Android/sdk/platform-tools/
export ANDROID_HOME=/Users/subbarao/L
You have cordova-android v 6.1.2. There was an issue with cordova-android. Check this answer.
Try
ionic platform add android@6.2.1
Or
ionic platform add android@latest
Update:
if you are using ionic cli v3, the command is
ionic cordova platform add android@latest
Update SDK and gradle version and then try following commands in the terminal
export ANDROID_HOME=/Applications/ADT/sdk
PATH environment variable
export PATH=$PATH:$ANDROID_HOME/bin