Flutter => showDialog / AlertDialog => No MaterialLocalizations found

Question

just new to Flutter but very impressed. I want to show a Dialog if a PushNotification arrives via Firebase \"onMessage\".

But every Time I get a Exception \"No MaterialL

Answer 1

Flutter 1.0, Dart 2.x

This solution works on both StatelessWidget widget and StatefulWidget widget.

On the top, in your declaration you can create a static navKey:

class MyApp extends StatefulWidget {
  final String title; // sample var you want to pass to your widget
  static final navKey = new GlobalKey();
  const MyApp({Key navKey, this.title}) : super(key: navKey);
  @override
  State createState() => _MyAppState();
}

On the layout part you should use the key:

return MaterialApp(
        navigatorKey:MyApp.navKey,
        title: widget.title,
        ...

So, when you need the current context for your dialog or other widget, in the state part you can do :

@override
  void initState() {
  final context = MyApp.navKey.currentState.overlay.context;
  showMyCustomDialog(context);
  ...
  super.initState();
}