Enable pause and play gif using glide 4.0

gistfile1.txt

  Glide.with(holder.itemView)
    .asBitmap()
    .load("http://i.imgur.com/VuItY0T.gif")
    .into(holder.imageContent)
  
  val playPauseGif = PlayPauseGif(holder.imageContent)
            
  holder.imageContent.setOnClickListener{
    if (playPauseGif.isPlaying()) {
      Log.e(TAG, "pausing")
      playPauseGif.pause()
    } else {
      Log.e(TAG, "playing")
      playPauseGif.play()
      Glide.with(holder.itemView)
        .load("http://i.imgur.com/VuItY0T.gif")
        .into(playPauseGif)
   }
 }
 
class PlayPauseGif(view: ImageView ? ): DrawableImageViewTarget(view) {
  var gif: GifDrawable ? = null
  
  override fun onResourceReady(resource: Drawable, transition: Transition < in Drawable > ? ) {
   if (resource is GifDrawable) {
    gif = resource
   }
   super.onResourceReady(resource, transition)
  }

  fun isPlaying(): Boolean {
   gif?.let {
    return it.isRunning
   }
   return false
  }

  fun play() {
   gif?.start()
  }

  fun pause() {
   gif?.stop()
  }
}
 
 

not working, onResourceReady never called