To stop all Android emulator instance, we do,
adb emu kill
If we want to kill a specific Android emulator instance, we need to find out the device's serial number or identifier. For this, we do,
adb devices
The typical emulator serial number or identifier is emulator-5554. Using this as an example, we can kill the emulator instance using
the command below,
adb -s emulator-5554 emu kill
