I thought that, as long as one doesn't visit dodgy sites and only install apps from reputable sources, there was no need to have antivirus on Android phones? I believe that the language used for Android phones is Java which makes it difficult, or at least not attractive enough, for virus writers to exploit. See here click here and also click here
I have used Android phones for years, and have never installed any anti-virus applications. I have never been troubled by a virus, and neither has anyone I know with an Android phone. People often confuse malware with viruses, but there's a difference.
Asked if Android users should install anti-virus applications on their devices, Android's chief security officer said 'absolutely not'.
Provided you download apps from the Play Store, and stay away from the darker side of the web you will be safe enough. Malware can get into the Play Store, but Google usually finds it pretty quickly, and removes the offending app. These are usually fakes, posing as the real thing, and provided you exercise a degree of commonsense you should be safe enough.
The vast majority of Android users never experience any security concerns.