If you are trying, from your Android application through the Android emulator, to access an external service on the same computer (such as your own Google App Engine site) by using the host name
localhost or the IP-address
127.0.0.1, you might get a
java.net.ConnectException: localhost/127.0.0.1:8888 - Connection refused error - even though you can perfectly well access the service outside the Android application.
The reason why a
ConnectException occurs is because
127.0.0.1 inside the Android emulator is the emulator's own loopback interface, meaning all request sent to the destination will be looped backed to the emulator and won't actually be sent to your local machine.
To by pass this, simply replace
localhost with the IP-address
10.0.2.2, as this is a special address towards the real local host. Done!
Old comments from Blogger
bbviana, March 21, 2012 at 1:34 PM