How do I disable the Internet connection in Android Emulator?

From Eclipse

To disable the Internet connection, go to Eclipse and do

menu Window -> Show view -> Other -> Android -> Devices

Now select your running emulator and again go to:

menu Window -> Show View -> Other -> Android -> Emulator Control

Now in that... set Data to Unregister from Home.

From Device and Emulator

On the device or in the emulator, go to:

Setting -> Wireless & networks -> Airplane Mode -> OK

Try the below command

WIFI:
$ adb shell svc wifi enable
$ adb shell svc wifi disable
MOBILE DATA:
$ adb shell svc data enable
$ adb shell svc data disable

You can disable the Internet connection by pressing F8 in any Android emulator. It is a toggle button, so if it doesn't have Internet connection then it will start the Internet connection and if it already has an Internet connection then it will dis-connect it.