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(

animations/lib/src/misc/animated_list.dart

@@ -68,6 +68,7 @@ class _AnimatedListDemoState extends State<AnimatedListDemo> {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
+        title: Text('AnimatedList'),
         actions: <Widget>[
           IconButton(
             icon: Icon(Icons.add),

animations/lib/src/misc/animated_positioned.dart

@@ -38,7 +38,7 @@ class _AnimatedPositionedDemoState extends State<AnimatedPositionedDemo> {
   @override
   Widget build(BuildContext context) {
     final size = MediaQuery.of(context).size;
-    final appBar = AppBar();
+    final appBar = AppBar(title: Text('AnimatedPositioned'));
     final topPadding = MediaQuery.of(context).padding.top;
     // AnimatedPositioned animates changes to a widget's position within a Stack
     return SafeArea(

animations/lib/src/misc/animated_switcher.dart

@@ -44,6 +44,7 @@ class _AnimatedSwitcherDemoState extends State<AnimatedSwitcherDemo> {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
+        title: Text('AnimatedSwitcher'),
         actions: [
           MaterialButton(
             onPressed: () => setState(

animations/lib/src/misc/expand_card.dart

@@ -10,7 +10,9 @@ class ExpandCardDemo extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(),
+      appBar: AppBar(
+        title: Text('Expandable Card'),
+      ),
       body: Center(
         child: ExpandCard(),
       ),

animations/lib/src/misc/hero_animation.dart

@@ -10,7 +10,9 @@ class HeroAnimationDemo extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(),
+      appBar: AppBar(
+        title: Text('Hero Animation'),
+      ),
       body: GestureDetector(
         child: Hero(
           tag: 'hero-page-child',

animations/lib/src/misc/physics_card_drag.dart

@@ -11,7 +11,9 @@ class PhysicsCardDragDemo extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(),
+      appBar: AppBar(
+        title: Text('Spring Physics'),
+      ),
       body: DraggableCard(
         child: FlutterLogo(
           size: 128,