anchor.diff:  
     @override
     Widget build(BuildContext context) {
  -    return new Scaffold(
  -      appBar: new AppBar(
  +    return Scaffold(
  +      appBar: AppBar(
           title: const Text('Test explicit intents'),
         ),
  -      body: new Center(
  -        child: new Padding(
  +      body: Center(
  +        child: Padding(
             padding: const EdgeInsets.symmetric(vertical: 15.0),
  -          child: new Column(
  +          child: Column(
               mainAxisAlignment: MainAxisAlignment.spaceEvenly,
               children: <Widget>[
  -              new RaisedButton(
  +              RaisedButton(
                   child: const Text(
                       'Tap here to display panorama\nimagery in Google Street View.'),
                   onPressed: _openGoogleMapsStreetView,
                 ),
  -              new RaisedButton(
  +              RaisedButton(
                   child: const Text('Tap here to display\na map in Google Maps.'),
                   onPressed: _displayMapInGoogleMaps,
                 ),
  -              new RaisedButton(
  +              RaisedButton(
                   child: const Text(
                       'Tap here to launch turn-by-turn\nnavigation in Google Maps.'),
                   onPressed: _launchTurnByTurnNavigationInGoogleMaps,
                 ),
  -              new RaisedButton(
  +              RaisedButton(
                   child: const Text('Tap here to open link in Google Chrome.'),
                   onPressed: _openLinkInGoogleChrome,
                 ),
  -              new RaisedButton(
  +              RaisedButton(
                   child: const Text(
                       'Tap here to test explicit intent fallback to implicit.'),
                   onPressed: _testExplicitIntentFallback,
  
positive.code: import 'package:platform/platform.dart';
  
  void main() {
    runApp(new MyApp());
  }
  
  class MyApp extends StatelessWidget {
    // This widget is the root of your application.
    @override
    Widget build(BuildContext context) {
      return new MaterialApp(
        title: 'Flutter Demo',
        theme: new ThemeData(
          primarySwatch: Colors.blue,
        ),
        home: new MyHomePage(),
        routes: <String, WidgetBuilder>{
          ExplicitIntentsWidget.routeName: (BuildContext context) =>
              const ExplicitIntentsWidget()
  
negative.code:   }
  
    void _launchTurnByTurnNavigationInGoogleMaps() {
      final AndroidIntent intent = AndroidIntent(
          action: 'action_view',
          data: Uri.encodeFull(
              'google.navigation:q=Taronga+Zoo,+Sydney+Australia&avoid=tf'),
  