Open drawer on clicking AppBar

Use a Key in your Scaffold and show the drawer by calling myKey.currentState.openDrawer(), here is a working code:

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import "package:flutter/material.dart";

class Test extends StatefulWidget {
  _TestState createState() => new _TestState();

class _TestState extends State<Test> {
  final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();

  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(),

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