While I have not personally seen this virus attack Android (until now!), Google search indicates its happening quite often. For sure, something to watch out for in the future. Unfortunately, the following will not help the OP but I'm posting it for general consumption.
The following relates to the FBI virus when it attempts to attack a PC running Windows.
The FBI virus is picked up most readily on porn sites simply by clicking a link, or a popup. The porn site itself may be infected so simply clicking to navigate the site can launch the FBI virus page. However, just because the page is displayed in your browser doesn't mean your PC is infected... yet.
It's very easy to NOT become infected if you know what to do.
1) DO NOT attempt to close your browser.
2) DO NOT attempt to close the website you're on.
3) DO NOT click on any popup messages that may be displayed in your browser.
As long as you don't do any of the things listed above, you PC will NOT download the virus and you will NOT become infected. What triggers the installation is when you start clicking on stuff in your browser to try to get rid of the FBI page. Basically... DON'T CLICK ON ANYTHING!
If you see the FBI page displayed, stop what you're doing in your browser immediately and open Task Manager. To launch Task Manager in Windows, on the keyboard press the keys ctrl+alt+del (all together)... or right click on your Taskbar and select Task Manager from the menu.
Once Task Manager launches, select the Process tab, find the listing(s) of your browser in the list, click on it to highlight it, then click on End Process. You will receive a Task Manager warning... just click on "yes" to confirm. This will kill your browser, and at the same time, ensure the FBI virus does not get installed.
Some portable browsers will launch two instances of the browser and both will be listed in Task Manager. For Firefox portable, you will see firefox.exe and FirefoxPortable.exe. Ending firefox.exe will normally end both instances, but be sure both are killed and your browsers closes when you click on End Process. Once your browser closes, double-check Task Manager to make sure all instances of your browser has been killed.
Once your browser closes, you no longer need to worry about the FBI virus infecting you. Uhhh... as long as you followed the 3 steps above!
I've been on Android for some years now, but never did as much as I do now on my phone. That said, in the past, I didn't even install that many apps on any of my phones. As it is, if there is an app that acts like "Task Manager" on a Windows PC, then it may help to avoid this FBI virus installation/infection.
If any of you know of an app that can successfully kill a browser app (like Task Manager is doing above), please list it.
Of course, now that I'm aware of this virus on Android, I'm out to do some research!
Aloha!