dynamic_link_1.dart

void main() {
  runApp(new MaterialApp(
    title: 'Dynamic Links Example',
    routes: <String, WidgetBuilder>{
      '/': (BuildContext context) => new MyHomeWidget(), // Default home route
      '/helloworld': (BuildContext context) => new MyHelloWorldWidget(),
    },
  ));
}

class _MyHomeWidgetState extends State<_MyHomeWidget> {
  .
  .
  .
  @override
  void initState() {
    super.initState();
    _retrieveDynamicLink();
  }

  Future<void> _retrieveDynamicLink() async {
    final PendingDynamicLinkData data = await FirebaseDynamicLinks.instance.retrieveDynamicLink();
    final Uri deepLink = data?.link;

    if (deepLink != null) {
      Navigator.pushNamed(context, deepLink.path); // '/helloworld'
    }
  }
  .
  .
  .
}