java - cannot resolve symbol setOnPageChangeListener -

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i couldnot find relevant solution scenario.i working on select respected tab manually on tab swipe..i learning

http://www.androidgreeve.com/2014/01/android-actionbar-navigating-with-swipeable-tabs-and-views.html

in mainactivity ,on adding viewpager.setonpagechangelistener doesnot recognizes ..it thows error ...

cannot resolve symbol setonpagechangelistener

here code

package com.example.administrator.fragmentsexample;  import android.support.v7.app.actionbar; import android.support.v4.view.viewpager; import android.os.bundle; import android.support.v7.app.appcompatactivity;  import com.example.administrator.adapter.tabspageradapter;  public class mainactivity extends appcompatactivity implements         actionbar.tablistener {      private viewpager viewpager;     private tabspageradapter madapter;     private actionbar actionbar;     // tab titles     private string[] tabs = {"social", "organizer", "movies"};      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          // initilization         viewpager = (viewpager) findviewbyid(r.id.pager);         actionbar = getsupportactionbar();         madapter = new tabspageradapter(getsupportfragmentmanager());         viewpager.setadapter(madapter);         actionbar.sethomebuttonenabled(false);         actionbar.setnavigationmode(actionbar.navigation_mode_tabs);          // adding tabs         (string tab_name : tabs) {             actionbar.addtab(actionbar.newtab().settext(tab_name)                     .settablistener(this));          }     }      @override     public void ontabselected(actionbar.tab tab, android.support.v4.app.fragmenttransaction fragmenttransaction) {      }      @override     public void ontabunselected(actionbar.tab tab, android.support.v4.app.fragmenttransaction fragmenttransaction) {      }      @override     public void ontabreselected(actionbar.tab tab, android.support.v4.app.fragmenttransaction fragmenttransaction) {      }      viewpager.setonpagechangelistener(new viewpager.onpagechangelistener() {          @override         public void onpageselected(int position) {             // on changing page             // make respected tab selected             actionbar.setselectednavigationitem(position);         }          @override         public void onpagescrolled(int arg0, float arg1, int arg2) {         }          @override         public void onpagescrollstatechanged(int arg0) {         }     });  }

what missing ?

try move this:

viewpager.setonpagechangelistener(new viewpager.onpagechangelistener() {      @override     public void onpageselected(int position) {         // on changing page         // make respected tab selected         actionbar.setselectednavigationitem(position);     }      @override     public void onpagescrolled(int arg0, float arg1, int arg2) {     }      @override     public void onpagescrollstatechanged(int arg0) {     } });

into oncreate. think current placement of call not make sense. :-)


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