Setting up a RecyclerView

[dwf2008]

Noobie here.
I am working on my first app using a Recyclerview. I have an Adapter (SongsAdapter) to make it work. This is my code for the Adapter>

package com.example.musiclyrics;

import android.content.Context;
import android.database.Cursor;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import androidx.recyclerview.widget.RecyclerView;

import com.google.android.material.snackbar.Snackbar;

public class SongsAdapter extends RecyclerView.Adapter<SongsAdapter.ViewHolder> {
private Context context;
private Cursor cursor;

public SongsAdapter(Context context) {
this.context = context;
}
public void setCursor(Cursor cursor) {
this.cursor = cursor;

notifyDataSetChanged();
cursor.moveToFirst(); // Move cursor to the first row
ViewHolder holder = onCreateViewHolder(null, 0);

onBindViewHolder(holder, 0);
}

@override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.songs_layout, parent, false);
return new ViewHolder(view);
}

@override
public void onBindViewHolder(ViewHolder holder, int position) {

if (cursor != null && cursor.moveToPosition(position)) {

int songNameIndex = cursor.getColumnIndex("SONG_NAME");
int artistIndex = cursor.getColumnIndex("ARTIST");
int durationIndex = cursor.getColumnIndex("DURATION");
int songIdIndex = cursor.getColumnIndex("KEY_ID");

String songName = cursor.getString(songNameIndex);
String artist = cursor.getString(artistIndex);
String duration = cursor.getString(durationIndex);
final int songId = cursor.getInt(songIdIndex);

holder.songNameTextView.setText(songName);
holder.artistTextView.setText(artist);
holder.durationTextView.setText(duration);

holder.itemView.setOnClickListener(new View.OnClickListener() {
@override
public void onClick(View v) {
// MainActivity.varCurrentSong = songId;
// Handle the click event
}
});
}
cursor.moveToNext()

}

@override
public int getItemCount() {
return (cursor != null) ? cursor.getCount() : 0;
}

public static class ViewHolder extends RecyclerView.ViewHolder {
TextView songNameTextView;
TextView artistTextView;
TextView durationTextView;

public ViewHolder(View itemView) {
super(itemView);
songNameTextView = itemView.findViewById(R.id.txt_songName);
artistTextView = itemView.findViewById(R.id.txt_Artist);
durationTextView = itemView.findViewById(R.id.txt_Duration);
}
}
}

At runtime this appears to work OK but the screen only shows the first record. I have tried about 50 different ideas and suggestions on how to make this work to no avail. Can someone help me out please?
Thanks