Build categories

contact_detail_view.dart

class ContactPage extends StatelessWidget {

  // ...
  
   _ContactCategory _buildPhoneCategory() {
    var phoneItems = _contact.phones.map((phone) =>
                        _ContactCategoryItem(
                          icon: Icons.message,
                          lines: <String>[phone.number, phone.type]
                        )).toList();

    return _ContactCategory(
      icon: Icons.call,
      children:phoneItems
    );
  }


  _ContactCategory _buildCategory(IconData categoryIcon, IconData categoryItemIcon,
                                  List<String> lines) {
    return _ContactCategory(
      icon: categoryIcon,
      children: <_ContactCategoryItem>[
        _ContactCategoryItem(
          icon: categoryItemIcon,
          lines: lines
        )
      ]
    );
  }

}