public TextSpinner<T> setSpinner(@NonNull final Spinner spinner) {
        this.spinner = spinner;

        this.spinner.setAdapter(createSpinnerAdapter());
        this.spinner.setOnItemSelectedListener(this);

        return this;
    }
if spinner should be represented by a (GUI) Spinner, set this spinner element here
main/src/main/java/cgeo/geocaching/ui/TextSpinner.java