Thumbs down vote on this matter too. Android isn't Windows, the necessity of an antivirus utility has merit for one but not necessarily the other. It might give you peace of mind to install one on your mobile device but that's its biggest benefit, you feel safer but your device is not necessarily any better off. Plus now you've added some AV utility that's using up system resources that might otherwise be used for all the things you actually do use your phone/tablet for.
It's not that Android AV utilities are completely snake oil, if you're actually having a problem than use one and maybe it will fix things, but you'd be better off overall focusing more on things like protecting your online presence and social networking services (most not being specifically tied to any particular operating system), those are the big targets these days.