How to navigate to a new page from Flutter PopupMenuButton

In this Google flutter code example we are going to learn how to navigate to a new page from Flutter PopupMenuButton.

You can copy and adopt this source code example to your android project without reinventing the wheel.

The code is based on flutter version 1.

Main.dart (App entry point)

import 'package:flutter/material.dart';
import 'nav_to_newpage_popupmenu_task-9.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: NavToNewpagePopupMenu(),
    );
  }
}

nav_to_newpage_popupmenu_task-9.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

enum PageEnum {
  firstPage,
  secondPage,
}

class NavToNewpagePopupMenu extends StatefulWidget {
  @override
  NavToNewpagePopupMenuState createState() {
    return new NavToNewpagePopupMenuState();
  }
}

class NavToNewpagePopupMenuState extends State<NavToNewpagePopupMenu> {
  _onSelect(PageEnum value) {
    switch (value) {
      case PageEnum.firstPage:
        Navigator.of(context).push(
            CupertinoPageRoute(builder: (BuildContext context) => FirstPage()));
        break;
      case PageEnum.secondPage:
        Navigator.of(context).push(CupertinoPageRoute(
            builder: (BuildContext context) => SecondPage()));
        break;
      default:
        Navigator.of(context).push(CupertinoPageRoute(
            builder: (BuildContext context) => SecondPage()));
        break;
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text("Navigate to new page PopupMenuButton Example"),
        ),
        body: Center(
          child: PopupMenuButton<PageEnum>(
            onSelected: _onSelect,
            child: Text("Show Popup Menu"),
            itemBuilder: (context) => <PopupMenuEntry<PageEnum>>[
                  PopupMenuItem<PageEnum>(
                    value: PageEnum.firstPage,
                    child: Text("Goto First Page"),
                  ),
                  PopupMenuItem<PageEnum>(
                    value: PageEnum.secondPage,
                    child: Text("Goto Second Page"),
                  ),
                ],
          ),
        ));
  }
}

class FirstPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("First Page"),
      ),
    );
  }
}

class SecondPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Second Page"),
      ),
    );
  }
}

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