Is it possible to perhaps restrict the bird (with its mate for company perhaps?) ... a nice warm place (if it is cold) ... by restricting its freerange it will be in a less stress environment and less likely to injure itself (or be injured by others)
The following site has some excellent illustrations on how to figure eight bandage a wing ( direct reproduction of the illustration is not possible due to copyrights):
http://www.starlingtalk.com/fractures.htm
I urge you to stabilize the wing with the figure of eight bandage..the following PDF...
How is your birdie? I did not reply as raindrops suggestion (to figure-eight wrap the wing with vet wrap) was the correct advice and also to give aspirin (no other type of aspirin substitute tho)... i did see however that rainbo never posted the illustration for the figure-eight bandage... did...