Flutter: Snackbar does not show up after using barcode_scan plugin

On my prototype flutter app (flutter ver. 0.5.1 beta), I use both the snackbar and the barcode_scan plugin (ver. 0.0.4) and the snackbar DOES show up (with the result of the scan as a string). All credits go to Wahib Ul Haq for easier snackbar editing:

Display SnackBar in Flutter

In my case, there are 2 things worth noticing.

1. I don't use keyScaffold at all. I declare a BuildContext as a variable (I call it scaffoldContext) to hold the body of the Scaffold.

2. I declare and initialise a new Scaffold. For its body, I write a Builder. Inside the builder, I initialize scaffoldContext as context for the Builder.

Here's my code for easier understanding:

import 'package:flutter/material.dart'; import 'package:barcode_scan/barcode_scan.dart'; import 'package:flutter/services.dart'; [...] void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( [...], home: MyHomePage(), ); } } class MyHomePage extends StatefulWidget { MyHomePage({Key key}) : super(key: key); @override _MyHomePageState createState() => new _MyHomePageState(); } class _MyHomePageState extends State<MyHomePage> { //This is what I meant in note #1. BuildContext scaffoldContext; String barcode; @override initState() { super.initState(); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('MyApp'), ), //This is what I meant in note #2. body: Builder(builder: (BuildContext context) { scaffoldContext = context; return Center( child: Column(children: <Widget>[ ListTile( [...] ), ListTile( [...] ), [...] ] ));}), floatingActionButton: FloatingActionButton( mini: true, child: Icon(Icons.crop_free), onPressed: fabPressed), )}; void createSnackBar(String message) { final snackBar = new SnackBar(content: new Text(message), backgroundColor: Colors.black ); Scaffold.of(scaffoldContext).showSnackBar(snackBar); } void fabPressed() async { barcode = ""; try { barcode = await BarcodeScanner.scan(); setState(() => this.barcode = barcode); createSnackBar(barcode); } on PlatformException catch (e) { if (e.code == BarcodeScanner.CameraAccessDenied) { setState(() { this.barcode = 'The user did not grant the camera permission!'; }); } else { setState(() => this.barcode = 'Unknown error: $e'); } } on FormatException { setState(() => this.barcode = 'null (User returned using the "back"-button before scanning anything. Result)'); } catch (e) { setState(() => this.barcode = 'Unknown error: $e'); } } }