Display SnackBar in Flutter

Question

I want to display a simple SnackBar inside Flutter\'s stateful widget. My application creates new instance of MaterialApp with a stateful widget ca

Answer 1

There's three problems. The first is that you don't have a Scaffold anywhere, and the Scaffold widget is the one that knows how to show snack bars. The second is that you have a key for getting a hold of the scaffold, but you've put it on a Padding instead (and Paddings don't have any knowledge of snack bars). The third is that you've used the key before the widget that it's associated with has had a chance to be initialised, since initState is called before build.

The simplest solution is to change the home line in your MyApp widget to:

home: new Scaffold(body: new MyHomePage()),

...and then remove all mention of _scaffoldKey and instead use Scaffold.of(context) where you currently have _scaffoldKey.currentState.