Android extras(fb share, toast etc.) plugin for Unity3D
If you don't like overriding unity's activity take a look at this repository https://github.com/paganini24/UnityAndroidExtraPlugins/
How-To: -Import unity project from Unity3d and export it as Google Android Project -Import unityeclipseplugin from Eclipse and check android build path for class.jar(if not set correct path remove it and re-add it as external jar). -Import unity generated eclipse project into Eclipse and open Android tab from it's properties. From libraries section add UnityEclipsePlugin as Library. -Make your own refactoring like package names... -Run from a device
For tutorials : http://www.nevzatarman.com