extend BottomSheetViewPagerListener to update nest scrolling child

BottomSheetViewPagerListener.java

private static class BottomSheetViewPagerListener extends ViewPager.SimpleOnPageChangeListener {
    private final ViewPager mViewPager;
    private final ViewPagerBottomSheetBehavior<View> mBehavior;

    private BottomSheetViewPagerListener(ViewPager viewPager, View bottomSheetParent) {
        mViewPager = viewPager;
        mBehavior = ViewPagerBottomSheetBehavior.from(bottomSheetParent);
    }

    @Override
    public void onPageSelected(int position) {
        mViewPager.post(new Runnable() {
            @Override
            public void run() {
                mBehavior.updateScrollingChild();
            }
        });
    }
}