As an addition to my previous post about the “Gemini” Android virus, here is a link to a supposedly free Android Antivirus software.
Please note, I have not checked this out personally yet so I can not vouch for it nor its effectiveness however it seems legit and professional (it is released by the folks that published news about the “Gemini” Trojan).
http://apps.talkandroid.com/apps/communication/2098-com+lookout/
https://www.mylookout.com/
UPDATE; I installed the software and ran a few basic tests, it seem to function as advertised, sadly I did not succeed in downloading the eicar test virus file so I could verify the antivirus part of the software 😐 but it does indeed scan new software installed on the phone and the locate phone also works as advertised.