bottomNavigation.dart

class MyBottomNavigationButton extends StatefulWidget {
  @override
  _MyBottomNavigationButtonState createState() =>
      _MyBottomNavigationButtonState();
}

class _MyBottomNavigationButtonState extends State<MyBottomNavigationButton> {
  int _currentIndex = 0;
  final List<Widget> _children = [
    MyHomePage(),
    Account(),
    Profile()
  ];
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: _children[_currentIndex],
      bottomNavigationBar: BottomNavigationBar(
        // type: BottomNavigationBarType.fixed,
        onTap: onTapBar,
        currentIndex: _currentIndex,
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            // ignore: deprecated_member_use
            title: Text('MyHomePage'),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.library_books_rounded),
            // ignore: deprecated_member_use
            title: Text('Account'),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.account_circle),
            // ignore: deprecated_member_use
            title: Text('Profile'),
          )
        ],
      ),
    );
  }
}