如何在Android P上获得停止媒体风格通知的X按钮?

我想把X显示在 MediaStyle Notification Android P.我看到很多帖子基本上都说这在API 21和更高版本上不起作用,但下面是一个显示它的应用程序的截图:

我在下面尝试过此代码,但它没有显示:

    Notification notification = new NotificationCompat.Builder(getApplicationContext(), TESTID)
            .setSmallIcon(R.drawable.ic_launcher_background)
            .setContentTitle("Track title")
            .setContentText("Artist - Album")
            .addAction(R.drawable.ic_fast_forward_black_24dp, "fwd", pi)
            .addAction(R.drawable.ic_fast_forward_black_24dp, "fwd", pi)
            .addAction(R.drawable.ic_fast_forward_black_24dp, "fwd", pi)
            .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.vectors_525058875))
            .setAutoCancel(false)
            .setStyle(new MediaStyle()
                    .setMediaSession(mediaSessionCompat.getSessionToken()).setShowCancelButton(true).setCancelButtonIntent(pi))
            .build();
    notificationManager.notify(300, notification);