public void displayActionItem(final int layout, final @StringRes int info, final boolean withBadge, final Action1<Boolean> action) {
        displayActionItem(layout, getString(info), withBadge, action);
    }
display action notifications, e. g. update or backup reminders
action callback accepts true, if action is to be performed / false if to be postponed
main/src/main/java/cgeo/geocaching/MainActivity.java