@Override
public @NonNull View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

    final View view = mInflater.inflate(R.layout.my_custom_spinner_item, parent, false);

    TextView savingsTV = (TextView) view.findViewById(R.id.tv_savings);
    TextView accountNumberTV = (TextView) view.findViewById(R.id.tv_account_number);
    TextView balanceTV = (TextView) view.findViewById(R.id.tv_balance);

    CustomObject object = objectsList.get(position);

    // Format your fields to strings here
    savingsTV.setText(object.getSavings());
    accountNumberTV.setText(object.getAccountNumber());
    balanceTV.setText(object.getBalance());

    return view;
}

spinner = (Spinner) findViewById(R.id.spinner);
CustomArrayAdapter adapter = new CustomArrayAdapter(this, getList());
spinner.setAdapter(adapter);