I'd like to associate a countdown timer with each item in my
ListActivity.  For example, if there are 5 items, each item should
have a textview that displays a countdown from a starting value (that
is specific to the item) down to zero.

In the following post, it is recommended to use a Handler to implement
a timer mechanism, so that the main UI thread is used to update the
textview.

http://android-developers.blogspot.com/2007/11/stitch-in-time.html

What should one do if there are multiple timers?  If the main UI
thread is used to continuously update multiple timers, will that not
make the application less responsive?  Is there a recommended way to
(1) associate a timer with each item in a ListActivity, and (2) update
multiple timers?

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