drop-down list and action bar on honeycomb

I'm working on Android 3.0, and I would like to add a drop-down list in the actio开发者_运维百科n bar. This drop-down list will have to display a list of "missions" of the day. So I'm not sure that this tutorial is useful for me : http://developer.android.com/guide/topics/ui/actionbar.html#Dropdown

As a beginner I'm a bit lost. If you have any clue...

Thanks.