public static void initialize(final MenuItem menuItem, final Callback callback) {
        final ActionProvider actionProvider = MenuItemCompat.getActionProvider(menuItem);
        if (actionProvider instanceof ListNavigationSelectionActionProvider) {
            final ListNavigationSelectionActionProvider navigateAction = (ListNavigationSelectionActionProvider) actionProvider;
            navigateAction.setCallback(callback);
        }
    }
Creates a new instance. ActionProvider classes should always implement a
constructor that takes a single Context parameter for inflating from menu XML.

@param context Context for accessing resources.
main/src/main/java/cgeo/geocaching/apps/cachelist/ListNavigationSelectionActionProvider.java