implemented using_bottom_nav_bar example

using_bottom_nav_bar/lib/main.dart

@@ -0,0 +1,85 @@
+import 'package:flutter/material.dart';
+
+import './FirstTab.dart' as first_tab;
+import './SecondTab.dart' as second_tab;
+import './ThirdTab.dart' as third_tab;
+
+void main() {
+  runApp(new MaterialApp(
+      // Title
+      title: "Using Tabs",
+      // Home
+      home: new MyHome()));
+}
+
+class MyHome extends StatefulWidget {
+  @override
+  MyHomeState createState() => new MyHomeState();
+}
+
+// SingleTickerProviderStateMixin is used for animation
+class MyHomeState extends State<MyHome> with SingleTickerProviderStateMixin {
+  // Create a tab controller
+  TabController controller;
+
+  @override
+  void initState() {
+    super.initState();
+
+    // Initialize the Tab Controller
+    controller = new TabController(length: 3, vsync: this);
+  }
+
+  @override
+  void dispose() {
+    // Dispose of the Tab Controller
+    controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return new Scaffold(
+      // Appbar
+      appBar: new AppBar(
+        // Title
+        title: new Text("Using Bottom Navigation Bar"),
+        // Set the background color of the App Bar
+        backgroundColor: Colors.blue,
+      ),
+      // Set the TabBar view as the body of the Scaffold
+      body: new TabBarView(
+        // Add tabs as widgets
+        children: <Widget>[
+          new first_tab.First(),
+          new second_tab.Second(),
+          new third_tab.Third()
+        ],
+        // set the controller
+        controller: controller,
+      ),
+      // Set the bottom navigation bar
+      bottomNavigationBar: new Material(
+        // set the color of the bottom navigation bar
+        color: Colors.blue,
+        // set the tab bar as the child of bottom navigation bar
+        child: new TabBar(
+          tabs: <Tab>[
+            new Tab(
+              // set icon to the tab
+              icon: new Icon(Icons.favorite),
+            ),
+            new Tab(
+              icon: new Icon(Icons.adb),
+            ),
+            new Tab(
+              icon: new Icon(Icons.airport_shuttle),
+            ),
+          ],
+          // setup the controller
+          controller: controller,
+        ),
+      ),
+    );
+  }
+}