AV-Test noted some limitations in recent tests for Android AV products, which are continuing to improve and handle these new threats. Kaspersky, F-Secure, and Zoner were rated among best current solutions

Report: Most Free Android Antivirus Apps Useless
http://securitywatch.pcmag.com/security-software/290411-report-most-free-android-antivirus-apps-useless

QUOTE: Each product was installed on an Android device containing inactive specimens of over 150 recent Android threats. Researchers ran an on-demand scan and recorded how many threats were detected. Kaspersky and F-Secure detected over half. The best free product, Zoner Antivirus, caught 32 percent. All the rest detected under 10 percent, and some didn’t detect any samples at all.