How to launch an Android activity at random time?

I'm developing an android app, which is supposed to ask questions at random time. So it's like a passive application, which "b开发者_StackOverflow社区ecome" active at random time.

And I would like to know how can i do this? And if it's possible?

Thanks a lot, Jérémy

Use the alarm manager and schedule an alarm for your own intent at a random time in the future: http://developer.android.com/reference/android/app/AlarmManager.html