Real-time timer on Android

In what way that I can have a real-time timer for task scheduling on Android?

Currently I am using Java开发者_开发百科.util.timer for my real-time application? However, the timer is missing firing when garbage collection is running or other other stuff. The description on java.util.timer says "this class does not offer guarantees about the real-time nature of task scheduling.". Then, which class that I should use on Android then? Or are there any other approach to have a real-time guarantee timer on Android?

Forgot to mention that the timer that I need is at 20 - 40 milliseconds precision level. That means, I need it to fire every 20 - 40 milliseconds.

Handler.postDelayed(Runnable r, long delayMillis);

Does not have a note about whether or not it guarantees it to happen on time. I've used this mechanism before and never noticed any inconsistency with it. However, i've only used it for relatively short intervals (less than a minute) If you are looking for something farther out than that I would suggest you take a look at the AlarmClock application in the Android source. That will probably give you a good approach. That being said if you are looking for extreme precision(down to seconds or farther) I doubt you're going to be able to find anything with guarantees. There are too many things that could be going on that could cause potential misfires.