viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {       @Override     public void onPageSelected(int position) {         // on changing the page         // make respected tab selected         actionBar.setSelectedNavigationItem(position);     }       @Override     public void onPageScrolled(int arg0, float arg1, int arg2) {     }       @Override     public void onPageScrollStateChanged(int arg0) {     } });