External usb bluetooth do not work in android 4.0.4 kernel 3.0.8+
I don't think that android supports external bluetooth adapters. From this Google+ post it seems like CyanogenMod is adding support for it soon. Depending on what device you have you may be able to root and install this.

If this is not an option then you would need to provide more details on what device you are trying to use the dongle with.