BottomNavyBar 

A beautiful and animated bottom navigation. The navigation bar use your current theme, but you are free to customize it.

Preview	PageView

Use this package as a library

1. Depend on it

Add this to your package’s pubspec.yaml file:

dependencies:
  bottom_navy_bar: ^5.5.0

2. Install it

You can install packages from the command line:

with Flutter:

$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:bottom_navy_bar/bottom_navy_bar.dart';

Customization (Optional) 

BottomNavyBar 

• iconSize – the item icon’s size
• items – navigation items, required more than one item and less than six
• selectedIndex – the current item index. Use this to change the selected item. Default to zero
• onItemSelected – required to listen when a item is tapped it provide the selected item’s index
• backgroundColor – the navigation bar’s background color
• showElevation – if false the appBar’s elevation will be removed
• mainAxisAlignment – use this property to change the horizontal alignment of the items. It is mostly used when you have ony two items and you want to center the items
• curve – param to customize the item change’s animation
• containerHeight – changes the Navigation Bar’s height

BottomNavyBarItem 

• icon – the icon of this item
• title – the text that will appear next to the icon when this item is selected
• activeColor – the active item’s background and text color
• inactiveColor – the inactive item’s icon color
• textAlign – property to change the alignment of the item title

Getting Started 

Add the dependency in pubspec.yaml:

dependencies:
  ...
  bottom_navy_bar: ^5.5.0

Basic Usage 

Adding the widget

bottomNavigationBar: BottomNavyBar(
   selectedIndex: _selectedIndex,
   showElevation: true, // use this to remove appBar's elevation
   onItemSelected: (index) => setState(() {
              _selectedIndex = index;
              _pageController.animateToPage(index,
                  duration: Duration(milliseconds: 300), curve: Curves.ease);
    }),
   items: [
     BottomNavyBarItem(
       icon: Icon(Icons.apps),
       title: Text('Home'),
       activeColor: Colors.red,
     ),
     BottomNavyBarItem(
         icon: Icon(Icons.people),
         title: Text('Users'),
         activeColor: Colors.purpleAccent
     ),
     BottomNavyBarItem(
         icon: Icon(Icons.message),
         title: Text('Messages'),
         activeColor: Colors.pink
     ),
     BottomNavyBarItem(
         icon: Icon(Icons.settings),
         title: Text('Settings'),
         activeColor: Colors.blue
     ),
   ],
)

Use with PageView and PageController 

class _MyHomePageState extends State<MyHomePage> {

  int _currentIndex = 0;
  PageController _pageController;

  @override
  void initState() {
    super.initState();
    _pageController = PageController();
  }

  @override
  void dispose() {
    _pageController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("Nav Bar")),
      body: SizedBox.expand(
        child: PageView(
          controller: _pageController,
          onPageChanged: (index) {
            setState(() => _currentIndex = index);
          },
          children: <Widget>[
            Container(color: Colors.blueGrey,),
            Container(color: Colors.red,),
            Container(color: Colors.green,),
            Container(color: Colors.blue,),
          ],
        ),
      ),
      bottomNavigationBar: BottomNavyBar(
        selectedIndex: _currentIndex,
        onItemSelected: (index) {
          setState(() => _currentIndex = index);
          _pageController.jumpToPage(index);
        },
        items: <BottomNavyBarItem>[
          BottomNavyBarItem(
            title: Text('Item One'),
            icon: Icon(Icons.home)
          ),
          BottomNavyBarItem(
            title: Text('Item One'),
            icon: Icon(Icons.apps)
          ),
          BottomNavyBarItem(
            title: Text('Item One'),
            icon: Icon(Icons.chat_bubble)
          ),
          BottomNavyBarItem(
            title: Text('Item One'),
            icon: Icon(Icons.settings)
          ),
        ],
      ),
    );
  }
}

Example of implementation

example/lib/main.dart

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  int currentIndex = 0;
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text('You have pushed the button this many times:'),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
      bottomNavigationBar: BottomNavyBar(
        selectedIndex: currentIndex,
        showElevation: true,
        itemCornerRadius: 8,
        curve: Curves.easeInBack,
        onItemSelected: (index) => setState(() {
          currentIndex = index;
        }),
        items: [
          BottomNavyBarItem(
            icon: Icon(Icons.apps),
            title: Text('Home'),
            activeColor: Colors.red,
            textAlign: TextAlign.center,
          ),
          BottomNavyBarItem(
            icon: Icon(Icons.people),
            title: Text('Users'),
            activeColor: Colors.purpleAccent,
            textAlign: TextAlign.center,
          ),
          BottomNavyBarItem(
            icon: Icon(Icons.message),
            title: Text(
              'Messages test for mes teset test test ',
            ),
            activeColor: Colors.pink,
            textAlign: TextAlign.center,
          ),
          BottomNavyBarItem(
            icon: Icon(Icons.settings),
            title: Text('Settings'),
            activeColor: Colors.blue,
            textAlign: TextAlign.center,
          ),
        ],
      ),
    );
  }
}

https://pub.dev/packages/bottom_navy_bar

Pub Dev Link

https://github.com/pedromassango/bottom_navy_bar

Github Link