The message or advertisement: "Your Android has been infected with a virus. Tap OK to remove now.", is a fake. If you are browsing the internet on your Android device and the message pops up, please do not follow the instructions in it. This is because, the message will always popup claiming that your Android device is infected with a virus even when it is not. The advertisement is considered spam and there is no virus or other malware threats.
The Fake and Spam Android Advertisement

Android getting slower? Click to clean your android!
Your Android has been infected with a virus. Tap OK to remove now.
***** IMMEDIATE RESPONSE REQUIRED *****
Your Samsung Android has been exposed to a virus while browsing recent adult-oriented websites.
Tap Ok to Scan Your Phone for Viruses.
hxxp://mobilesystemsecurity.com
******!!! WARNING !!! ******
Your Android may have multiple Viruses!
Some sites you've recently visited may have infected your android device
Pleas install anivirus to protet your Phone.
The fake advertisement will take you to the following malicious website:hxxp://virus.warning.s-com.net. Note: The cyber-criminals behind the fake virus message will use different website names and versions of the message. So, the message that you have received may not look like the one below. But, the message is still a fake.

Your Samsung Android is INFECTED
WARNING! Your personal photos, Facebook and other personal passwords, as well as credit card information are at risk!
Your Samsung Android has been exposed to a fatal Trojan virus while browsing recent adult-oriented websites.
Remove Virus Now
Your web browser cannot detect a Trojan horse or other malware on your mobile device or computer, so if any message pops up in your web browser claiming that a virus, Trojan horse or any other malware was discovered on your mobile device or computer, please ignore it.
To check for viruses or malware on your mobile device or computer, always ensure that you have antivirus software installed. If you do not have antivirus software on your Android device, you can install a free or commercial one from the Google Play store.
Android users whose mobile devices are constantly getting pop-ups, can do the following to fix the problem:
- Put your Android smartphone in Airplane mode,
- Open your web browser on your Android phone and let the page load,
- Go to "Settings,"
- Click "Privacy,"
- Click "Clear your Private Data" or "Clear browsing data,"
- Clear your "Browser History" and Cache.
Also,
- go to "Settings"
- change your "Homepage" to something else, if "www.hetria.xyz" is set as your default Homepage.
- Go back to "Settings"
- Go to "Application Manager"
- Remove all unknown apps, or apps you think maybe causing the popups under the "Downloaded" section.
The fake and spam advertisement is similar to the following: