private void populateFromPagerAdapter() {
  removeAllTabs();

  if (mPagerAdapter != null) {
   final int adapterCount = mPagerAdapter.getCount();
   for (int i = 0; i < adapterCount; i++) {
     addTab(newTab().setText(mPagerAdapter.getPageTitle(i)), false);
   }

   // Make sure we reflect the currently set ViewPager item
   if (mViewPager != null && adapterCount > 0) {
    final int curItem = mViewPager.getCurrentItem();
    if (curItem != getSelectedTabPosition() && curItem < getTabCount()) {
     selectTab(getTabAt(curItem));
    }
   }
  } else {
   removeAllTabs();
  }
 }

for (int i = 0; i < adapterCount; i++) {
        addTab(newTab().setText(mPagerAdapter.getPageTitle(i)), false);
      }

@Override
  public CharSequence getPageTitle(int position) {
    return list_title.get(position);
  }