Show user-friendly error page instead of exception in Flutter

custom_error_widget.dart

Widget getErrorWidget(BuildContext context, FlutterErrorDetails error) {
  return Center(
    child: Text(
      "Error appeared.",
      style: Theme.of(context).textTheme.title.copyWith(color: Colors.white),
    ),
  );
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    ErrorWidget.builder = (FlutterErrorDetails errorDetails) {
      return getErrorWidget(context, errorDetails);
    };

    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}