迁移到viewpager2而不加载所有上一页和下一页边界视图，以及与viewpager2中的getPageWidth()等效的方法是什么

public class CustomPagerAdapter extends RecyclerView.Adapter<CustomPagerAdapter.ViewHolder> {
    private List<Fragment> fragments;

    public CustomPagerAdapter(List<Fragment> fragments) {
        this.fragments = fragments;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_page, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        Fragment fragment = fragments.get(position);
        // 根据不同的页面类型设置不同的布局参数
        if (getItemViewType(position) == 0) {
            // 设置全屏宽度
            holder.itemView.setLayoutParams(new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
        } else {
            // 设置半屏宽度
            holder.itemView.setLayoutParams(new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
        }
        // 设置Fragment到对应的视图
        FragmentManager fragmentManager = fragment.getChildFragmentManager();
        fragmentManager.beginTransaction().replace(R.id.fragment_container, fragment).commit();
    }

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

    @Override
    public int getItemViewType(int position) {
        // 返回不同的值表示不同页面的宽度比例
        if (position == 0 || position == fragments.size() - 1) {
            return 0; // 全屏宽度
        } else {
            return 1; // 半屏宽度
        }
    }

    static class ViewHolder extends RecyclerView.ViewHolder {
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
        }
    }
}