Android RecyclerView - Class is not abstract and does not implement abstract base class member

Question

I got this:

class RecentAdapter(private val context: Context, private val videolist: MutableList<Videos>) : RecyclerView.Adapter<RecentAdapter.ViewHolder>(){

    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        val video = videolist[position]

        holder.title.text = video.title

        holder.remove.setOnClickListener {

            videolist.removeAt(holder.adapterPosition)
            notifyItemRemoved(holder.adapterPosition)

        }

    }

    override fun getItemCount() = videolist.size

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.videoview, parent, false)
        return ViewHolder(view)
    }

    class ViewHolder(itemView: View?) : RecyclerView.ViewHolder(itemView!!){

        val title = itemView!!.videoviewTitle!!
        val remove = itemView!!.videoviewRemove!!
        val like = itemView!!.videoviewLike!!

    }
}

I get the error:

Class 'RecentAdapter' is not abstract and does not implement abstract base class member public abstract fun onBindViewHolder(@NonNull p0: RecentAdapter.ViewHolder, p1: Int): Unit defined in android.support.v7.widget.RecyclerView.Adapter

on class RecentAdapter

And

'onBindViewHolder' overrides nothing

And

Unresolved reference on title and remove

Can someone help me?

Answer 1

Change onBindViewHolder() 's signature to this:

override fun onBindViewHolder(holder: ViewHolder, position: Int)

The 1st argument's type is ViewHolder and not RecyclerView.ViewHolder

Answer 2

For the first question:

You are not overriding the right method. In your constructor, you are declaring that the ViewHolder to use is RecentAdapter.ViewHolder , but your onBindViewHolder references the generic RecyclerView.ViewHolder . To fix this, simply change

override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {

to

override fun onBindViewHolder(holder: RecentAdapter.ViewHolder, position: Int) {

For the second question, I am not sure what the error is with the given files. Make sure you that there are views with Ids videoViewTitle and videoViewRemove within the videoview layout file to start?