updated: using_listview example with working implementation

using_listview/lib/contactlist/contact_list.dart

@@ -0,0 +1,23 @@
+import 'package:flutter/material.dart';
+import 'package:using_listview/contactlist/contact_list_item.dart';
+import 'package:using_listview/contactlist/modal/contact.dart';
+
+class ContactsList extends StatelessWidget {
+  final List<ContactModal> _contactModal;
+
+  ContactsList(this._contactModal);
+
+  @override
+  Widget build(BuildContext context) {
+    return new ListView(
+      padding: new EdgeInsets.symmetric(vertical: 8.0),
+      children: _buildContactsList(),
+    );
+  }
+
+  List<ContactListItem> _buildContactsList() {
+    return _contactModal
+        .map((contact) => new ContactListItem(contact))
+        .toList();
+  }
+}