未初始化嵌套的Viewpager片段

public class NestedFragment extends Fragment {
    private ViewPager nestedViewPager;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_nested, container, false);
        nestedViewPager = view.findViewById(R.id.nestedViewPager);

        // 初始化嵌套的ViewPager及其适配器
        NestedPagerAdapter adapter = new NestedPagerAdapter(getChildFragmentManager());
        nestedViewPager.setAdapter(adapter);

        return view;
    }

    private class NestedPagerAdapter extends FragmentPagerAdapter {
        private List<Fragment> fragments;

        public NestedPagerAdapter(FragmentManager fm) {
            super(fm);
            fragments = new ArrayList<>();
            fragments.add(new NestedChildFragment1());
            fragments.add(new NestedChildFragment2());
        }

        @Override
        public Fragment getItem(int position) {
            return fragments.get(position);
        }

        @Override
        public int getCount() {
            return fragments.size();
        }
    }
}