Flutter-Ernaehrungsapp/lib/android/views/navigation/navigation_screen.dart

import 'package:flutter/material.dart';

class NavigationScreen extends StatefulWidget {
  const NavigationScreen({super.key});

  @override
  NavigationScreenState createState() => NavigationScreenState();
}

class NavigationScreenState extends State<NavigationScreen> {
  int _selectedIndex = 0;
  final _pages = ["Page 1", "Page 2", "Page 3"];
  String _selectedPage = "Page 1";

  final PageController _pageController = PageController(initialPage: 0);

  void _onItemTapped(int index) {
    setState(() {
      _selectedIndex = index;
      _selectedPage = _pages[index];
      _pageController.animateToPage(index,
          duration: const Duration(milliseconds: 300), curve: Curves.easeInOut);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(_selectedPage),
      ),
      body: PageView(
        controller: _pageController,
        onPageChanged: (int index) {
          setState(() {
            _selectedPage = _pages[index];
            _selectedIndex = index;
          });
        },
      ),
      bottomNavigationBar: BottomNavigationBar(
        items: const <BottomNavigationBarItem>[
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: 'Page 1',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.work),
            label: 'Page 2',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.school),
            label: 'Page 3',
          ),
        ],
        currentIndex: _selectedIndex,
        onTap: _onItemTapped,
      ),
    );
  }
}