So I have a very simple android activity that starts a timer when you hit a button.

Timer timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
doStuff();
}
}, 15 * 60 * 1000);

So this worked reasonably well for me when I was testing but as it turns out when the screen becomes inactive so does the timer. I was a bit surprised by this. I understand you need to create a service to have anything running in the background but I hadn't realized this is required for an activity in the foreground when the phone has inactivated the screen due to lack of activity. What confuses me is I think this worked as I expected originally and just in the last few weeks or so has the timer been affected by the phone saving power. I could be wrong though..

So basically my questions are: am I seeing expected behavior? Do I need to create all timers as services or somehow disallow powersaving?

thanks for any advice, Patrick