Implement expand and collapse notification android

Question

I need to implement expand and collapse notification in status bar for android 4.0 and above version. I have search on google for this but didn\'t getting any code solution for

Answer 1

There is a method for this function you can show a small icon when notification collapsed and show a large one when a notification expanded.

val bitmap = BitmapFactory.decodeResource(resources, R.drawable.notification)

var notification = NotificationCompat.Builder(context, CHANNEL_ID)
    .setSmallIcon(R.drawable.new_post)
    .setContentTitle(imageTitle)
    .setContentText(imageDescription)
    .setLargeIcon(bitmap)
    .setStyle(NotificationCompat.BigPictureStyle()
            .bigPicture(bitmap)
            .bigLargeIcon(null))
    .build()