android - OncreateView in Fragment is not calling with an singleInstance -

i have 2 activities , b extending 1 base class main , base class has 1 framelayout in layout including in both of activities , b respective layouts.

i checking instance creation of fragment in fragment inflating when go particular acitivity.

here code :

public class baseacitvity extends activity {      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_base_acitvity);     }  } 

here firstactivity::

public class firstactivity extends baseacitvity {      public firstfragment firstfragment ;     @override     protected void oncreate(bundle savedinstancestate) {         // todo auto-generated method stub         super.oncreate(savedinstancestate);         setcontentview(r.layout.firstactivitylayout);         firstfragment = new firstfragment();         fragmentmanager fragmentmanager = getfragmentmanager();         fragmentmanager.begintransaction().replace(r.id.card_view_layout,firstfragment).commit();          button buttonclick = (button)findviewbyid(r.id.clickfirstactivity);         buttonclick.setonclicklistener(new view.onclicklistener() {              @override             public void onclick(view v) {                 // todo auto-generated method stub                 intent intent =  new intent(getapplicationcontext(),secondactivity.class);                 startactivity(intent);             }         });     }  }  public class secondactivity extends baseacitvity {      @override     protected void oncreate(bundle savedinstancestate) {         // todo auto-generated method stub         super.oncreate(savedinstancestate);         setcontentview(r.layout.secondactivity);          firstfragment fragment  = firstfragment.getinstance();          if(fragment == null)         {             fragment = new firstfragment();         }         else {          fragmentmanager fragmentmanager = getfragmentmanager();         if(fragment !=null)         {         fragmentmanager.begintransaction().replace(r.id.card_view_layout,fragment).commit();          }         }             }  } 

and fragment ::

public class firstfragment extends fragment {      private static firstfragment currentinstance;          firstfragment () {         currentinstance = this;     }      public static synchronized firstfragment  getinstance() {         if (currentinstance == null)              currentinstance = new firstfragment();         return currentinstance;     }     @override     public view oncreateview(layoutinflater inflater, viewgroup container,             bundle savedinstancestate) {         // todo auto-generated method stub         return inflater.inflate(r.layout.fragment_one, container, false);      }  } 

now issue if have created instance of fragment in firstactivity , checking singleinstance in fragment , @ time of secondactivity why oncreatview() of fragment doesn't call instance gives not null.

please me..so there way call oncreateview() inflate fragmentlayout.