java - pager Cannot resolved as a variable -

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i'm trying make action bar tabs, got error:"pager cannot resolved variable..." thansk help.

java code;

package olcay.akgn.fibonaccicalculator;  import android.support.v7.app.actionbaractivity; import android.support.v7.app.actionbar; import android.support.v4.app.fragment; import android.support.v4.app.fragmentmanager; import android.support.v4.app.fragmentpageradapter; import android.support.v4.view.viewpager; import android.app.actionbar.tab; import android.app.actionbar.tablistener; import android.app.fragmenttransaction; import android.os.bundle; import android.util.log; import android.view.layoutinflater; import android.view.menu; import android.view.menuitem; import android.view.view; import android.view.viewgroup; import android.os.build;    public class mainactivity extends actionbaractivity implements tablistener {  android.app.actionbar actionbar;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     viewpager viewpager = (viewpager) findviewbyid(r.id.pager);    viewpager.setadapter(new myadapter(getsupportfragmentmanager()));      actionbar=getactionbar();     actionbar.setnavigationmode(actionbar.navigation_mode_tabs);      tab tab1=actionbar.newtab();     tab1.settext("hesaplayıcı");     tab1.settablistener(this);       tab tab2=actionbar.newtab();     tab2.settext("bölünme");     tab2.settablistener(this);      actionbar.addtab(tab1);     actionbar.addtab(tab2);           }  @override public void ontabselected(tab tab, fragmenttransaction ft) {     log.d("akgn","ontabreselected @ "+" position"+tab.getposition()+"name"+tab.gettext());  }  @override public void ontabunselected(tab tab, fragmenttransaction ft) {     log.d("akgn","ontabreselected @ "+" position"+tab.getposition()+"name"+tab.gettext());  }  @override public void ontabreselected(tab tab, fragmenttransaction ft) {     log.d("akgn","ontabreselected @ "+" position"+tab.getposition()+"name"+tab.gettext());      } }  class myadapter extends fragmentpageradapter  {  public myadapter(fragmentmanager fm) {     super(fm);     // todo auto-generated constructor stub }  @override public fragment getitem(int arg0) {     fragment fragment=null;     if(arg0==0){         fragment=new hesapla();      }         if(arg0==0){         fragment=new bolunme ();      }        return null; }  @override public int getcount() {     // todo auto-generated method stub     return 2; }        }

note; begin project video tutorial; https://www.youtube.com/watch?v=iel0ylvvzho

i tried "create "pager" in type id " did not solved issue. please me.

you need declare viewpager widget on activity_main layout.

never edit r class - automatically generated.


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