android - Cannot resolve method getActivity() in a class extending FragmentActivity -

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i have extended fragment activity in class need have custom toolbar. so,i added code toolbar setsupportactionbar(toolbar) did not work.then, added appcompatactivity.getactivity() cast did not work well.

here code - 

public class main_fragment extends fragmentactivity implements fragmentdrawer.fragmentdrawerlistener { private toolbar toolbar; private fragmentdrawer drawerfragment;   @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.main_fragment);      toolbar = (toolbar) findviewbyid(r.id.tool_bar);     ((appcompatactivity) getactivity()).setsupportactionbar(toolbar);     ((appcompatactivity) getactivity()).getsupportactionbar().setdisplayshowhomeenabled(true);      drawerfragment = (fragmentdrawer)             getsupportfragmentmanager().findfragmentbyid(r.id.fragment_navigation_drawer);     drawerfragment.setup(r.id.fragment_navigation_drawer, (drawerlayout) findviewbyid(r.id.drawer_layout), toolbar);     drawerfragment.setdrawerlistener(this);  }

appcompatactivity extends fragmentactivity. first thing have change 

extends fragmentactivity

with 

extends appcompatactivity

getactivity() method of fragment. activity has not method, don't need call use setsupportactionbar , getsupportactionbar

setsupportactionbar(toolbar); getsupportactionbar().setdisplayshowhomeenabled(true);

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