import "package:flutter/material.dart";
class Test extends StatefulWidget {
@override
_TestState createState() => new _TestState();
}
class _TestState extends State<Test> {
final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();
@override
Widget build(BuildContext context) {
return new Scaffold(
key: _scaffoldKey,
drawer: new Drawer(),
appBar: new AppBar(
leading: new IconButton(
icon: new Icon(Icons.settings),
onPressed: () => _scaffoldKey.currentState.openDrawer(),
),
),
);
}
}