Flutter-Ernaehrungsapp/lib/android/pages/nav_pages/main_page.dart

import 'package:ernaehrung/android/pages/nav_pages/progress_page.dart';
import 'package:ernaehrung/android/pages/nav_pages/today_page.dart';
import 'package:flutter/material.dart';
import 'meal_plan_page.dart';

class MainPage extends StatefulWidget {
  const MainPage({Key? key}) : super(key: key);

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

class MainPageState extends State<MainPage> {
  List pages = [
    const TodayPage(title: 'Today'),
    const MealPlanPage(title: 'Meal Plan'),
    const ProgressPage(title: 'Progress')
  ];

  int currentIndex = 0;
  void onTap(int index){
    setState(() {
      currentIndex = index;
      pages[currentIndex];
    });
  }


  @override
  Widget build(BuildContext context) {

    return Scaffold(
      appBar: AppBar(
        title: Text(pages[currentIndex].title),
        backgroundColor: pages[currentIndex].backgroundColor
      ),
      body: pages[currentIndex],
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: currentIndex,
        selectedItemColor: Colors.black54,
        unselectedItemColor: Colors.grey.withOpacity(0.5),
        showSelectedLabels: false,
        showUnselectedLabels: false,
        elevation: 0,
        onTap: onTap,
        items: const [
          BottomNavigationBarItem(
              icon: Icon(Icons.today),
              label: 'Today'
          ),
          BottomNavigationBarItem(
              icon: Icon(Icons.area_chart),
              label: 'Progress'
          ),
          BottomNavigationBarItem(
              icon: Icon(Icons.apple),
              label: 'Meal Plan'
          ),
        ],
      ),
    );
  }
}