Notification.kt

private fun createBubbleMetadata(
        contentUri: Uri,
        icon: IconCompat
    ): NotificationCompat.BubbleMetadata {
        val bubbleIntent =
            PendingIntent.getActivity(
                context,
                REQUEST_BUBBLE,
                Intent(context, MainActivity3::class.java)
                    .setAction(Intent.ACTION_VIEW)
                    .setData(contentUri),
                PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_MUTABLE
            )

        val builder =  NotificationCompat.BubbleMetadata.Builder(bubbleIntent, icon)

        return builder
            .setDesiredHeightResId(R.dimen.bubble_height)
            .setAutoExpandBubble(true)
            .setSuppressNotification(true)
            .build()
    }