Error:
Invalid command android
UnityEditor.HostView:OnGUI()
CommandInvokationFailure:
Unable to list target platforms. Ple
For Mac OS Users :
Go to your Android SDK folder and delete the tools folder (I recommend you to make a copy before deleting it, in case this solution does not solve the problem for you)
Then download the tools folder here :
http://dl-ssl.google.com/android/repository/tools_r25.2.5-macosx.zip
You can find all tools zip version here :
https://androidsdkoffline.blogspot.fr/p/android-sdk-build-tools.html
Then unzip the download file and place it in the Android sdk folder.
Hope it helps