This exception happens because you are using the context
of the widget that instantiated Scaffold
. Not the context
of a child of Scaffold
.
You can solve this by just using a different context :
Scaffold(
appBar: AppBar(
title: Text('SnackBar Playground'),
),
body: Builder(
builder: (context) =>
Center(
child: RaisedButton(
color: Colors.pink,
textColor: Colors.white,
onPressed: () => _displaySnackBar(context),
child: Text('Display SnackBar'),
),
),
),
);
Note that while we’re using Builder
here, this is not the only way to obtain a different BuildContext
.
It is also possible to extract the subtree into a different Widget
(usually using extract widget
refactor)