Added title (#614)

animations/lib/src/basics/01_animated_container.dart

@@ -48,7 +48,9 @@ class _AnimatedContainerDemoState extends State<AnimatedContainerDemo> {
     // the properties of a container. For example, you could use this to design expanding
     // and shrinking cards.
     return Scaffold(
-      appBar: AppBar(),
+      appBar: AppBar(
+        title: Text('AnimatedContainer'),
+      ),
       body: Center(
         child: Column(
           children: [

animations/lib/src/basics/02_page_route_builder.dart

@@ -10,7 +10,9 @@ class PageRouteBuilderDemo extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(),
+      appBar: AppBar(
+        title: Text('Page 1'),
+      ),
       body: Center(
         child: RaisedButton(
           child: Text('Go!'),
@@ -42,7 +44,9 @@ class _Page2 extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(),
+      appBar: AppBar(
+        title: Text('Page 2'),
+      ),
       body: Center(
         child: Text('Page 2!', style: Theme.of(context).textTheme.headline4),
       ),

animations/lib/src/basics/03_animation_controller.dart

@@ -53,7 +53,9 @@ class _AnimationControllerDemoState extends State<AnimationControllerDemo>
     // when building child widgets. You can also check the status to see if the animation
     // has completed.
     return Scaffold(
-      appBar: AppBar(),
+      appBar: AppBar(
+        title: Text('Animation Controller'),
+      ),
       body: Center(
         child: Column(
           mainAxisSize: MainAxisSize.min,

animations/lib/src/basics/04_tweens.dart

@@ -39,7 +39,9 @@ class _TweenDemoState extends State<TweenDemo>
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(),
+      appBar: AppBar(
+        title: Text('Tweens'),
+      ),
       body: Center(
         child: Column(
           mainAxisSize: MainAxisSize.min,

animations/lib/src/basics/05_animated_builder.dart

@@ -37,7 +37,9 @@ class _AnimatedBuilderDemoState extends State<AnimatedBuilderDemo>
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(),
+      appBar: AppBar(
+        title: Text('AnimatedBuilder'),
+      ),
       body: Center(
         // AnimatedBuilder handles listening to a given animation and calling the builder
         // whenever the value of the animation change. This can be useful when a Widget

animations/lib/src/basics/06_custom_tween.dart

@@ -47,6 +47,7 @@ class _CustomTweenDemoState extends State<CustomTweenDemo>
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
+        title: Text('Custom Tween'),
         actions: [
           MaterialButton(
             child: Text(

animations/lib/src/basics/07_tween_sequence.dart

@@ -59,7 +59,9 @@ class _TweenSequenceDemoState extends State<TweenSequenceDemo>
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(),
+      appBar: AppBar(
+        title: Text('Tween Sequences'),
+      ),
       body: Center(
         child: AnimatedBuilder(
           animation: animation,

animations/lib/src/basics/08_fade_transition.dart

@@ -46,7 +46,7 @@ class _FadeTransitionDemoState extends State<FadeTransitionDemo>
     return Scaffold(
       appBar: AppBar(
         title: Text(
-          'Animated Widget',
+          'Fade Transition',
         ),
       ),
       body: Center(