Foreground Means “I Love You”

Just because Android terminates processes to free up memory does not mean that it will terminate just any process to free up memory. A foreground process — the most common of which is a process that has an activity in the foreground — is the least likely of all to be terminated. In fact, you can pretty much assume that if Android has to kill off the foreground process, that the phone is very sick and will crash in a matter of moments.

(and, fortunately, that does not happen very often)

So, if you are in the foreground, you are safe. It is only when you are not in the foreground that you are at risk of having the process be terminated.