替换后查看分页器不显示新片段

Question

我试图在我的arraylist适配器中添加一个onClick侦听器，当单击它时将打开一个片段。当我单击按钮时，原始片段消失了，但是新片段没有显示。

viewHolder.commentButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View view) {

            AppCompatActivity activity = (AppCompatActivity) view.getContext();
            CommentFragment commentFragment = new CommentFragment();

            activity.getSupportFragmentManager().beginTransaction().replace(R.id.viewPager , commentFragment).addToBackStack(null).commit();
        }
    });

我的新片段

public class CommentFragment extends Fragment {
View v;
ImageView backArrow;

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    super.onCreateView(inflater, container, savedInstanceState);
    v = inflater.inflate(R.layout.comment_fragment, container,false);

    backArrow = v.findViewById(R.id.backarrow);
    Log.i("inflated","Should be inflated");


    backArrow.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            getActivity().getSupportFragmentManager().popBackStack();
        }
    });

    return v;


}
public CommentFragment() {
}

}