GetContext空对象引用

Question

当我单击RecyclerView时，我想从Firebase中提取数据。我想将我从数据库中提取的数据传输到微调器。但是“ ViewGroup.getContext（）'对空对象进行引用”错误。我想将数据传输到Rooms数组并将其添加到微调器。

public class ProductsNewAdapter extends RecyclerView.Adapter<ProductsNewAdapter.ProductViewHolder> {
    List<String> Rooms = new ArrayList<String>();
    private Context context;

    @Override
    public void onBindViewHolder(final ProductViewHolder holder, final int position) {

        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
  public void onClick(final View v) {
                selectedPosition=position;
                notifyDataSetChanged();

  DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference();

                DatabaseReference refRooms = mDatabase.child("0").child("Rooms");


                refRooms.addValueEventListener(new ValueEventListener() {

                    @Override
                    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

for (DataSnapshot snapshot : dataSnapshot.getChildren()){
        Spinner spinner = (Spinner) v.findViewById(R.id.spinnerMain);
             ViewGroup parent = null;
 View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.product_laylout_new, parent, false);
         ProductViewHolder vh = new ProductViewHolder(view);
                    context = parent.getContext();
Intent i = new Intent(context.getApplicationContext(),ProductsNewAdapter.class);
                            context.startActivity(i); 
   // ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(Context,     //   android.R.layout.simple_spinner_item, Rooms);
                            //dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
               // spinner.setAdapter(dataAdapter);

  String data = snapshot.getValue(String.class);
  Rooms.add(data);
                          //  addListenerOnSpinnerItemSelection();

                        }
                    }

                    @Override
                    public void onCancelled(DatabaseError databaseError) {
                    }
                });
            }
        });