updated: navigation_drawer example with code refactoring

navigation_drawer/lib/screens/home.dart

@@ -0,0 +1,64 @@
+import 'package:flutter/material.dart';
+import 'package:navigation_drawer/screens/account.dart';
+import 'package:navigation_drawer/screens/settings.dart';
+
+class HomeScreen extends StatefulWidget {
+  @override
+  HomeScreenState createState() => new HomeScreenState();
+}
+
+class HomeScreenState extends State<HomeScreen> {
+  Drawer getNavDrawer(BuildContext context) {
+    var headerChild = new DrawerHeader(child: new Text("Header"));
+    var aboutChild = new AboutListTile(
+        child: new Text("About"),
+        applicationName: "Application Name",
+        applicationVersion: "v1.0.0",
+        applicationIcon: new Icon(Icons.adb),
+        icon: new Icon(Icons.info));
+
+    ListTile getNavItem(var icon, String s, String routeName) {
+      return new ListTile(
+        leading: new Icon(icon),
+        title: new Text(s),
+        onTap: () {
+          setState(() {
+            // pop closes the drawer
+            Navigator.of(context).pop();
+            // navigate to the route
+            Navigator.of(context).pushNamed(routeName);
+          });
+        },
+      );
+    }
+
+    var myNavChildren = [
+      headerChild,
+      getNavItem(Icons.settings, "Settings", SettingsScreen.routeName),
+      getNavItem(Icons.home, "Home", "/"),
+      getNavItem(Icons.account_box, "Account", AccountScreen.routeName),
+      aboutChild
+    ];
+
+    ListView listView = new ListView(children: myNavChildren);
+
+    return new Drawer(
+      child: listView,
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return new Scaffold(
+      appBar: new AppBar(
+        title: new Text("Navigation Drawer Example"),
+      ),
+      body: new Container(
+          child: new Center(
+        child: new Text("Home Screen"),
+      )),
+      // Set the nav drawer
+      drawer: getNavDrawer(context),
+    );
+  }
+}