Load data to a spinner of a fragment in a dialog

I have not been able to load the data I have in an array (string) to a spinner that is in a fragment which is shown when I touch a certain button.

Button code in the activity

AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setView(R.layout.fragment_fragment_ventas);
            builder.setCancelable(false);
            builder.setPositiveButton("agregar", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {

                }
            });
            builder.show();
            builder.create();

Fragment Code

    Spinner spinner_productos;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_fragment_ventas, container, false);

    ArrayAdapter adapter_spinner = ArrayAdapter.createFromResource(getActivity(), R.array.type_moned,R.layout.support_simple_spinner_dropdown_item);
    adapter_spinner.setDropDownViewResource(R.layout.support_simple_spinner_dropdown_item);
    spinner_productos.setAdapter(adapter_spinner);

    return view;
}

Array in the String file

<array name="type_moned">
    <item>Moneda</item>
    <item>COP</item>
    <item>COP</item>
    <item>COP</item>
    <item>COP</item>
    <item>COP</item>
</array>

thanks for the collaboration