无法将ViewPager中的片段替换为PopupWindow

public class MyFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_my, container, false);
        Button button = view.findViewById(R.id.button_show_popup);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showPopupWindow(v);
            }
        });
        return view;
    }

    private void showPopupWindow(View anchorView) {
        PopupWindow popupWindow = new PopupWindow(getContext());
        View popupView = LayoutInflater.from(getContext()).inflate(R.layout.popup_layout, null);
        popupWindow.setContentView(popupView);
        popupWindow.setWidth(ViewGroup.LayoutParams.WRAP_CONTENT);
        popupWindow.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);
        popupWindow.setFocusable(true);
        popupWindow.showAsDropDown(anchorView);
    }
}

popupWindow.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));

@Override
public void onDestroyView() {
    super.onDestroyView();
    if (popupWindow != null && popupWindow.isShowing()) {
        popupWindow.dismiss();
    }
}