'getItem' is final and cannot be overriden

[Cosmopal]

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Step 2: Describe your environment

• Android device: Android 13+
• Android OS version: target sdk 34
• Google Play Services version: _____
• Firebase/Play Services SDK version: 33.1.0
• FirebaseUI version: 8.0.2

Step 3: Describe the problem:

I am unable to override getItem function when extending the FirestorePagingAdapter. The build fails saying 'getItem' is final and cannot be overriden. I need to override getItem because I am trying to insert a header item in the list.

Steps to reproduce:

1. ---

2. ---

3. ---

Observed Results:

• What happened? This could be a description, logcat output, etc.

Build fails:

Expected Results:

• What did you expect to happen?

Expected to be able to override this function as it is marked protected in PagingDataAdapter class

Relevant Code:

class VideoFirebaseAdapter(var context: Context,
                                  private var showCategory: Boolean = true,
                                  options: FirestorePagingOptions<VideoMetadata>,
                                  private val hasHeader:Boolean = false)
  :FirestorePagingAdapter<VideoMetadata, RecyclerView.ViewHolder>(options) {

  private val TYPE_HEADER = 0
  private val TYPE_ITEM = 1

  val TAG = "VideoAdapter"

  var config = ImageLoaderConfiguration.Builder(this.context)
          .build()!!

  private val loader: ImageLoader = ImageLoader.getInstance()

  init {
      loader.init(config)
  }


  override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
      return if (hasHeader && viewType == TYPE_HEADER) {
          getHeaderVH(parent, viewType)!!
      } else {
          val itemView = LayoutInflater.from(context).inflate(R.layout.video_item, parent, false)
          VideoListItemVH(itemView, showCategory, context, loader)
      }
  }

  abstract fun getHeaderVH(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder?

  override fun getItemViewType(position: Int): Int {
      return TYPE_ITEM
      return if (hasHeader && position == 0)
          TYPE_HEADER
      else
          TYPE_ITEM
  }

  override fun getItemCount(): Int {
      return if (hasHeader)
          super.getItemCount() + 1
      else
          super.getItemCount()
  }

//  fails to override saying getItem is final
override fun getItem(position: Int): DocumentSnapshot? {
      if(hasHeader) {
          if(position==0) return super.getItem(0) // This will be ignored!
          return super.getItem(position-1)
      }
      return super.getItem(position)
  }

  override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int, video: VideoMetadata) {
      if (hasHeader && holder !is VideoListItemVH) {
          return
      } else {
          (holder as VideoListItemVH).bind(video)
      }
  }
}