android - There's no main.xml in /res/layout -

i've started reading "building first app" in developer.android.com.
when start creating different ui, refer /res/layout/main.xml file. can't find - under /res/layout there's activity_first.xml file ( activity' s name firstactivity ).

i've read might because of api16, same problem api15.

any ideas? thanks! :)

i use eclipse 3.7.2 ( indigo ) on linux debian, if matters

in new adt 20 ,there activity_main if activity name mainactivity

i think activity_first.xml main.xml..see in activity have setcontentview(r.layout.activity_first);