How to use

addOnAdapterChangeListener

method

in

androidx.viewpager.widget.ViewPager

protected void setupWithViewPager(@NonNull TabLayout tabLayout, @NonNull ViewPager viewPager) {
  final PagerAdapter adapter = viewPager.getAdapter();
  if (adapter == null) {
    throw new IllegalArgumentException("ViewPager does not have a PagerAdapter set");
  }
  setTabsFromPagerAdapter(tabLayout, adapter, viewPager.getCurrentItem());
  viewPager.getAdapter().registerDataSetObserver(mInternalDataSetObserver);
  viewPager.addOnPageChangeListener(mInternalTabLayoutOnPageChangeListener);
  viewPager.addOnAdapterChangeListener(mInternalOnAdapterChangeListener);
  tabLayout.addOnTabSelectedListener(mInternalOnTabSelectedListener);
}

private void onAttachedToViewPager(@NonNull ViewPager pager) {
  if (mView instanceof TabStripView)
    ((TabStripView) mView).onAttachedToViewPager(pager);
  else if (mView instanceof TabStripViewGroup)
    ((TabStripViewGroup) mView).onAttachedToViewPager(pager);
  pager.addOnPageChangeListener(this);
  pager.addOnAdapterChangeListener(this);
  onViewPagerAdapterChanged(null, pager.getAdapter());
}