ViewPager2不破坏片段

我有DialogFragment一个ViewPager2：

public class LightboxFragment extends DialogFragment {

    private ViewPager2 viewPager;

    private MyViewPagerAdapter myViewPagerAdapter;

    public static LightboxFragment newInstance() {
        LightboxFragment fragment = new LightboxFragment();

        return fragment;
    }

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

        viewPager = v.findViewById(R.id.viewPager);

        FrameLayout closeButtonContainer = v.findViewById(R.id.close_button_container);
        closeButtonContainer.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dismiss();
            }
        });

        myViewPagerAdapter = new MyViewPagerAdapter(getActivity());
        viewPager.setAdapter(myViewPagerAdapter);

        return v;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    public class MyViewPagerAdapter extends FragmentStateAdapter {

        public MyViewPagerAdapter(FragmentActivity fa) {
            super(fa);
        }

        @NonNull
        @Override
        public Fragment createFragment(int position) {
            LightboxVideoFragment fragment = new LightboxVideoFragment();
            return fragment;
        }

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

    }

}

我LightboxVideoFragment看起来像这样：

public class LightboxVideoFragment extends Fragment {

    private SimpleExoPlayer exoPlayer;

    private PlayerView playerView;

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.slideshow_video, container, false);
    }

    @Override
    public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
        playerView = view.findViewById(R.id.player_view);

        MediaItem mediaItem = MediaItem.fromUri(media.getUrls().getMp4());
        exoPlayer = new SimpleExoPlayer.Builder(getContext()).build();
        exoPlayer.setRepeatMode(Player.REPEAT_MODE_ALL);
        playerView.setPlayer(exoPlayer);
        exoPlayer.setMediaItem(mediaItem);
        exoPlayer.prepare();
        exoPlayer.play();
    }

    @Override
    public void onResume() {
        super.onResume();

        if (exoPlayer != null) {
            exoPlayer.play();
        }
    }

    @Override
    public void onPause() {
        super.onPause();

        if (exoPlayer != null) {
            exoPlayer.pause();
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();

        if (exoPlayer != null) {
            exoPlayer.release();
        }
    }

}

我的问题是：关闭时DialogFragment，片段视频中的音频仍在播放。为什么是这样？我试着将onDestroy我的片段，并设置断点在那里，但是当驳回对话框断点从来不叫，也不是onPause或onDetach。

这是否还意味着在ExoPlayer关闭对话框时该实例仍处于活动状态？

取消对话框后，如何停止视频的音频？