How to use Spinner in Recyclerview?
<p>Which are the best practice to handle a Spinner in a <code>RecyclerView</code> Adapter?</p>

<p><strong>This is my <code>RecyclerView</code> Adapter:</strong></p>

<pre><code>public class CartAdapter extends BaseAdapter&lt;Object&gt; {

public CartAdapter(AbstractBaseActivity activity) {
    super(activity);
}

public static final int TYPE_PRODOTTO = 1;
public static final int TYPE_SCONTO = 2;

@Override
public int getItemViewType(int position) {

    if (items.get(position) instanceof Article)
        return TYPE_PRODOTTO;
    else
        return TYPE_SCONTO;
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View rowView = LayoutInflater.from(parent.getContext()).inflate(viewType == TYPE_PRODOTTO ? R.layout.item_cart : R.layout.item_cart_sconto, parent, false);
    return new ViewHolder(rowView);
}

@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
    final ViewHolder viewHolder = (ViewHolder) holder;

    final Object object = items.get(position);

    if (object instanceof Article) {

        viewHolder.getBinding().setVariable(BR.article, object);
        viewHolder.getBinding().executePendingBindings();

        assert viewHolder.quantitySpinner != null;
        assert viewHolder.cartoneQuantity != null;
        assert viewHolder.cartoneValue != null;

        CartSpinnerAdapter adapter = (CartSpinnerAdapter) viewHolder.quantitySpinner.getAdapter();
        adapter.clear();
        adapter.setCount(((Article) object).getQuantityAvailable());
        adapter.notifyDataSetChanged();

        viewHolder.quantitySpinner.setSelection(((Article) object).getQuantity() - 1); //In teoria qui la quantità non deve mai essere zero

        viewHolder.cartoneQuantity.setVisibility(position % 2 == 1 ? View.GONE : View.VISIBLE); //Controllo da togliere in futuro
        viewHolder.cartoneValue.setVisibility(position % 2 == 1 ? View.GONE : View.VISIBLE); //Controllo da togliere in futuro
    }

    final PopupMenu popup = new PopupMenu(getContext(), viewHolder.deleteMenu);
    MenuInflater inflater = popup.getMenuInflater();
    inflater.inflate(R.menu.delete_menu, popup.getMenu());

    viewHolder.deleteMenu.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            popup.show();
        }
    });

    popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
        @Override
        public boolean onMenuItemClick(MenuItem item) {
            if (item.getItemId() == R.id.action_delete) {
                removeData(holder.getAdapterPosition());
                ((CartActivity) activity).checkIfEmpty();
            }

            return true;
        }
    });
}

public class ViewHolder extends RecyclerView.ViewHolder {

    @BindView(R.id.item)
    View item;
    @Nullable
    @BindView(R.id.cart_image)
    ImageView cartImage;
    @BindView(R.id.delete_menu)
    ImageView deleteMenu;
    @Nullable
    @BindView(R.id.product_cartone_quantity)
    TextView cartoneQuantity;
    @Nullable
    @BindView(R.id.product_cartone_value)
    TextView cartoneValue;
    @Nullable
    @BindView(R.id.quantity_spinner)
    AppCompatSpinner quantitySpinner;

    private ViewDataBinding binding;

    public ViewHolder(View itemView) {
        super(itemView);
        ButterKnife.bind(this, itemView);
        binding = DataBindingUtil.bind(itemView);
        if (quantitySpinner != null)
            quantitySpinner.setAdapter(new CartSpinnerAdapter(itemView.getContext(), R.layout.support_simple_spinner_dropdown_item));
    }

    public ViewDataBinding getBinding() {
        return binding;
    }
}
}
</code></pre>

<p><strong>and this is my <code>Spinner</code> Adapter:</strong></p>

<pre><code>public class CartSpinnerAdapter extends ArrayAdapter&lt;String&gt; {

LayoutInflater inflater;

int count;

public CartSpinnerAdapter(Context context, int resource) {
    super(context, resource);

    inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

public CartSpinnerAdapter(Context context, int resource, int count) {
    super(context, resource);

    this.count = count;
    inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

public void setCount(int count) {
    this.count = count;
}

@Override
public View getDropDownView(int position, View convertView, ViewGroup parent) {
    return getStandardView(position, parent, true);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    return getStandardView(position, parent, false);
}

@Override
public int getCount() {
    return count;
}

private View getStandardView(int position, ViewGroup parent, boolean dropdown) {
    View row = inflater.inflate(R.layout.support_simple_spinner_dropdown_item, parent, false);

    TextView title = (TextView) row.findViewById(android.R.id.text1);

    title.setText(String.valueOf(position + 1));

    if (dropdown)
        title.setMinWidth(Utils.dpToPx(getContext(), 64));
    else
        title.setAlpha(0.5f);

    return row;
}
}
</code></pre>

<p>In this way when i scroll the <code>RecyclerView</code> i'm experiencing lag.</p>

<p><strong>If i remove these lines everything works fine:</strong></p>

<pre><code>CartSpinnerAdapter adapter = (CartSpinnerAdapter) viewHolder.quantitySpinner.getAdapter();
adapter.clear();
adapter.setCount(((Article) object).getQuantityAvailable());
adapter.notifyDataSetChanged();
</code></pre>

<p>So the problem is the way i handle the adapter of the <code>Spinner</code>, how can i handle this?</p>

<p>Thanks in advance.</p>