title: How create a bottom navigation bar which starts at page item1 and not at item0
body: <p>What I mean is that the page1 should open when application is launched</p>
  <p>My code</p>
  <pre><code>import 'package:flutter/material.dart';
  
  void main()
  {
    runApp(
     MyApp()
    );
  }
  class MyApp  extends StatelessWidget {
  
    @override
    Widget build(BuildContext context) {
      return new MaterialApp(
  
      );
    }
  }
  
  
  class MyBottomNavigationBar  extends StatefulWidget {
  
    @override
    _MyBottomNavigationBarState createState() =&gt; _MyBottomNavigationBarState();
  }
  
  class _MyBottomNavigationBarState extends State&lt;MyBottomNavigationBar&gt; {
    @override
    Widget build(BuildContext context) {
      return new Scaffold(
  
      );
    }
  }    
  </code></pre>
  <p>this is where page is opened:<br />
  <a href="https://i.stack.imgur.com/1GlK1.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1GlK1.png" alt="this is where page is opened" /></a></p>
  <p>this is where I want to open my page:<br />
  <a href="https://i.stack.imgur.com/HeCCs.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HeCCs.png" alt="this is where I want to open my page" /></a></p>