android - Navigation Drawer with View Pager with tabs not working -

note: have implemented tabs using viewpager. creating application has 3 tabs(fragments) in viewpager. want create navigation drawer can see these 3 tabs , clicking on navigates me corresponding tab.

main activity extends actionbaractivity , has following code

 private class draweritemclicklistener implements listview.onitemclicklistener {     @override     public void onitemclick(adapterview<?> parent, view view, int position, long id) {  fragment fragment = new categoryfragment();     bundle args = new bundle();     args.putint(categoryfragment.category_number, position);     fragment.setarguments(args);      fragmenttransaction transaction =      getsupportfragmentmanager().begintransaction();      transaction.replace(r.id.pager, fragment);     transaction.addtobackstack(null);     transaction.commit();     getsupportfragmentmanager().executependingtransactions();      // update selected item , title, close drawer     mdrawerlist.setitemchecked(position, true);     settitle(moptionsnavdrawer[position]);     mdrawerlayout.closedrawer(mdrawerlist); 

}

categoryfragment looks

    public static class categoryfragment extends android.support.v4.app.fragment {     public static final string category_number = "category_number";      public categoryfragment() {         // empty constructor required fragment subclasses     }      @override     public view oncreateview(layoutinflater inflater, viewgroup container,                              bundle savedinstancestate) {         int fragmentnumber = getarguments().getint(category_number);         view rootview=null;         if(fragmentnumber==0)         {              rootview = inflater.inflate(r.layout.f1, container, false);         }         else if (fragmentnumber==1)         {             rootview = inflater.inflate(r.layout.f2, container, false);         }         else if(fragmentnumber==2)         {             rootview = inflater.inflate(r.layout.f3, container, false);         }         else         {             rootview = inflater.inflate(r.layout.f4, container, false);         }         return rootview;     }   } 

oncreateview function inside categoryfragment getting called fragments(f1. f2. f3 ) not getting set. there method of invoking these fragments? each of these fragments respective tabs.

you need method in activity helps switch between tabs. like:

public void displayview(int position) {      // update main content replacing fragments     fragment fragment = null;     switch (position) {         case 0:             fragment = new fragmenta();                            break;         case 1:             fragment = new fragmentb();              break;         case 2:             fragment = new fragmentc();              break;          default:             break;     }      if (fragment != null) {         fragmenttransaction transaction =  fragmentmanager.begintransaction();         transaction.addtobackstack(null);         transaction.replace(r.id.frame_container, fragment);         transaction.commit(); 

each fragment should independent of each other, no need pass bundle info categoryfragment