The amount of people that have gotten virus' on their android ever is most likely significantly smaller than the number that activate an android each week. It's usually from the non-official app market in asian locales.
Just remember no OS is immune. Just know your source and if it seems to good to be true, it is. Even iOS managed to let some malware through. I have used Android since '08 with the G1 and have never had a problem.
The Chairman of Google said the whole maleware threat was a scam to get people to buy anti-malware programs. The article was posted by Android Central and Android Authority a couple of months ago. As stated above, Linux is rarely affected by maleware - you could say the same frequency as Apple's OS.
Get a free program like Lookout and you'll be fine.