CountDownTimer in a Service

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http://stackoverflow.com – I need some advices for my app development. I would appreciate if you could help me a bit. Here is what I would like to do: In my menu, I would like to show a list of CountDownTimer. When I click on an item of this list, I would like to show the time remaining of this timer. There is also a button to add an CountDownTimer to this list. As the list and button are inside a fragment (menu), all the timers should remain active even if I go through different Activities or if I switch to another app. So I thought that I should use a Service, which would allow the timers to go on even if my app is (HowTos)