If you have an Android phone or tablet, Malware IS a threat. You should consider running some type of anti-virus. Sophos has a free version available as do many others (Lookout, etc)

Revealed! The top five Android malware detected in the wild
No-one is in any doubt that Android malware is on the rise – but what is the most commonly encountered malware on the platform? Find out, and download a free anti-virus for your Android device.