Unless you are installing dodgy apps from dubious sources, I wouldn't worry about it too much.
Should be pretty safe if only get apps from Google Play. Just check what permissions any apps require, and read a few of the reviews.
Interesting fuaran. So you reckon i could, despite sometimes liberal browsing, just uninstall the AV?
I only ever install apps from playstore.
My chrome browser did once catch something that to my pretty untechy brain looked like some sort of ransomwhere. Whenever i clicked on the browser, even if i cleared the cache/-history, restarted the tab etc etc, the screen was partly covered by a warning asking for money. I just went into the tabs android settings, returned the browser to its original factory settings, all my bookmarks etc were automatically available again from syncb/backup, i updated the browser again using latest updates, all well. The virus or whatever never reappeared.