java - Android Studio error - Inconvertible types, Cannot cast Fragment -

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enter image description heretrying make simple program using fragments. exact error : 

"inconvertible types, cannot cast android.app.fragment com.example.something.something.workoutdetailfragment"

code:

public class mainactivity extends activity {       @override      protected void oncreate(bundle savedinstancestate) {          super.oncreate(savedinstancestate);          setcontentview(r.layout.activity_main);           workoutdetailfragment frag = (workoutdetailfragment) getfragmentmanager().findfragmentbyid(r.id.detail_frag); //error!          frag.setworkoutid(1);      }

}

(my activity_main_xml code)

your workoutdetailfragment should extends android.app.fragment, not android.support.v4.app.fragment. try out~


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