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Really I don't think you would need one as long as you aren't side loading apps from unknown sources or downloading shady ones from the Playstore. If you do however want one there's Avast which is nice.
Avast only scans apps (last time I looked).
I'm looking for full phone scanner.
Thats really the only place malware can hide
Whether you need antivirus protection on an android device is another debate entirely
If your phone is not rooted, then there will be no need to scan the entire system as the malware wouldn't have permission to access the system files.
If you are rooted, you'd still need to elevate privileges. And, if you do suspect an intrusion on a rooted device, a simple flash back to stock or a restore from a clean nonadroid backup would take care of the problem. That's probably why there hasn't been a big rush for full system scanning.