How to Navigate to another Screen from DropDownButton in Flutter

In this Google flutter code example we are going to learn how to to navigate to another screen from DropDownButton in Flutter.

The code is based on flutter version 1.0.0

Main.dart (App entry point)

import 'package:flutter/material.dart';
import 'week2/dropdownbutton_navigate.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: MyHomePage(title: 'Flutter Demo Home Page'),
      home: DropdownButtonNavigate(),
    );
  }
}

dropdownbutton_navigate.dart

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

class DropdownButtonNavigate extends StatefulWidget {
  @override
  DropdownButtonNavigateState createState() {
    return new DropdownButtonNavigateState();
  }
}

class DropdownButtonNavigateState extends State<DropdownButtonNavigate> {
  List<String> _screens = [
    "first",
    "second",
    "third",
  ];

  String _currentScreen = "first";

  void navTo(String screen) {
    setState(() => _currentScreen = screen);

    switch (screen) {
      case "first":
        Navigator.of(context)
            .push(MaterialPageRoute<Null>(builder: (BuildContext context) {
          return new FirstScreen();
        }));
        break;

      case "second":
        Navigator.of(context)
            .push(MaterialPageRoute<Null>(builder: (BuildContext context) {
          return new SecondScreen();
        }));
        break;

      case "third":
        Navigator.of(context)
            .push(MaterialPageRoute<Null>(builder: (BuildContext context) {
          return new ThirdScreen();
        }));
        break;

      default:
        Navigator.of(context)
            .push(MaterialPageRoute<Null>(builder: (BuildContext context) {
          return new FirstScreen();
        }));
        break;
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Navigate thru Screens - DropdownButton'),
      ),
      body: Center(
        child: DropdownButton<String>(
          onChanged: navTo,
          //value: _currentScreen ?? null,
          items: _screens.map((scr) {
            return DropdownMenuItem<String>(
              child: Text(scr + "Screen"),
            );
          }).toList(),
          hint: Text('Select Screen'),
        ),
      ),
    );
  }
}

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