android - I am in the process of creating 3 tabbed fragments, however I would like instead of a MainActivity to have a main fragment? -

is possible use code below in fragment , not in activity need navigation drawer navigate between fragments not activities. have 1 fragment creates 3 tabbed fragments. i've checked google , various other tutorials havent came across using fragment, activitites.

public class mainactivity extends appcompatactivity {      private static final string tag = "mainactivity";      private sectionspageadapter msectionspageadapter;      private viewpager mviewpager;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         log.d(tag, "oncreate: starting.");          msectionspageadapter = new sectionspageadapter(getsupportfragmentmanager());          // set viewpager sections adapter.         mviewpager = (viewpager) findviewbyid(r.id.container);         setupviewpager(mviewpager);          tablayout tablayout = (tablayout) findviewbyid(r.id.tabs);         tablayout.setupwithviewpager(mviewpager);     }      private void setupviewpager(viewpager viewpager) {         sectionspageadapter adapter = new sectionspageadapter(getsupportfragmentmanager());         adapter.addfragment(new tab1fragment(), "tab1");         adapter.addfragment(new tab2fragment(), "tab2");         adapter.addfragment(new tab3fragment(), "tab3");         viewpager.setadapter(adapter);     }  }