f you are using macOS, add both Android SDKemulatorandtoolsdirectories to the path:

Step 1:In my case the order was important, firstemulatorand thentools.

export ANDROID_SDK=$HOME/Library/Android/sdk
export PATH=$ANDROID_SDK/emulator:$ANDROID_SDK/tools:$PATH

Step 2:Reload you.bash_profileOr.bashrcdepending on OS

Step 3:Get list of emulators available:$emulator -list-avds

Step 4:Launch emulator from the command line and Replaceavdwith the name of your emulator$emulator @avd

Don’t forget to add the@symbol.

This was tested with macOS High Sierra 10.13.4 and Android Studio 3.1.2.