How to run command 'ionic run android' on specific device?
run with target device id, something like :
ionic run android --target=e78ab88d
EDIT
With new Ionic 3 CLI use :
ionic cordova run android --target=e78ab88d
For list of all available devices, use :
ionic cordova run android --list
try this command may help you
ionic run android --e78ab88d