Custom Bottombar Animation In Flutter :
Screenshot :

bar_item.dart
import 'package:flutter/material.dart'; class AnimatedBottomBar extends StatefulWidget { final List<BarItem> barItems; final Duration duration; final Function onBarTap; final BarStyle barStyle; AnimatedBottomBar( {this.barItems, this.duration, this.onBarTap, this.barStyle}); @override _AnimatedBottomBarState createState() => _AnimatedBottomBarState(); } class _AnimatedBottomBarState extends State<AnimatedBottomBar> with TickerProviderStateMixin { int selectedBarIndex = 0; @override Widget build(BuildContext context) { return Material( elevation: 10, child: Padding( padding: EdgeInsets.only( bottom: 5.0, top: 5.0, left: 5.0, right: 5.0, ), child: Row( mainAxisSize: MainAxisSize.max, mainAxisAlignment: MainAxisAlignment.spaceBetween, children: _buildBarItem()))); } List<Widget> _buildBarItem() { List<Widget> _barItems = List(); for (int i = 0; i < widget.barItems.length; i++) { BarItem item = widget.barItems[i]; bool isSelected = selectedBarIndex == i; _barItems.add(InkWell( splashColor: Colors.transparent, onTap: () { setState(() { selectedBarIndex = i; widget.onBarTap(selectedBarIndex); }); }, child: AnimatedContainer( padding: const EdgeInsets.symmetric (horizontal: 16.0, vertical: 8.0), duration: widget.duration, decoration: BoxDecoration( color: isSelected ? item.color.withOpacity(0.2) : Colors.transparent, borderRadius: BorderRadius.all (Radius.circular(30))), child: Row(children: <Widget>[ Icon(item.icon, color: isSelected ? item.color : Colors.black, size: widget.barStyle.iconSize), SizedBox(width: 10), AnimatedSize( duration: widget.duration, curve: Curves.easeInOut, vsync: this, child: Text(isSelected ? item.title : '', style: TextStyle( color: item.color, fontWeight: widget.barStyle.fontWeight, fontSize: widget.barStyle.fontSize))) ])))); } return _barItems; } } class BarStyle { final double fontSize, iconSize; final FontWeight fontWeight; BarStyle ( {this.fontSize = 18, this.fontWeight = FontWeight.w600, this.iconSize = 32}); } class BarItem { final String title; final IconData icon; final Color color; final Widget child; BarItem({ @required this.title,
bottom_bar.dart
import 'package:flutter/material.dart'; import 'bar_item.dart'; class BottomBar extends StatefulWidget { final List<BarItem> barItems = [ BarItem( title: 'Home', icon: Icons.home, color: Colors.indigo, child: Container(color: Colors.indigo)), BarItem( title: 'Likes', icon: Icons.favorite_border, color: Colors.pinkAccent, child: Container(color: Colors.pinkAccent)), BarItem( title: 'Profile', icon: Icons.person_outline, color: Colors.teal, child: Container(color: Colors.teal)), ]; @override State<StatefulWidget> createState() { return _BottomBarState(); } } class _BottomBarState extends State<BottomBar> { int selectedBarIndex = 0; @override Widget build(BuildContext context) { return Scaffold( body: AnimatedContainer( duration: const Duration(milliseconds: 400), child: widget.barItems[selectedBarIndex].child, ), bottomNavigationBar: AnimatedBottomBar( barItems: widget.barItems, duration: const Duration(milliseconds: 150), barStyle: BarStyle(fontSize: 20.0, iconSize: 30.0), onBarTap: (index) { setState(() { selectedBarIndex = index; }); })); } }
main.dart
import 'package:flutter/material.dart'; import 'bottom_bar.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Tutorial', debugShowCheckedModeBanner: false, home: BottomBar()); } }
The flutter tutorial is a website that bring you the latest and amazing resources of code. All the languages codes are included in this website. The languages like flutter, android, java,kotlin etc.with the help of this languages any user can develop the beautiful application
For more information about Flutter. visit www.fluttertutorial.in