AppBarLayout OffsetListener elevation to outside tab + swipeRefreshLayout

currentListener = new AppBarLayout.OnOffsetChangedListener() {
	@Override
	public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
		Fragment fragment = ((RegisteredFragmentPagerAdapter) viewPager.getAdapter()).getRegisteredFragment(tab.getPosition());
		if (fragment instanceof SwipeRefreshLayoutController) {
			((SwipeRefreshLayoutController) fragment).getSwipeRefreshLayout().setEnabled(verticalOffset == 0);
		}
		if (Math.abs(verticalOffset) == appBarLayout.getTotalScrollRange()) {
			ViewCompat.setElevation(tabLayout, activity.getResources().getDimension(R.dimen.appbar_elevation));
		} else {
			ViewCompat.setElevation(tabLayout, 0.0F);
		}
	}
};
appBarLayout.addOnOffsetChangedListener(currentListener);