How to apply elevation in bottom navigation bar in flutter?

Question

I want to apply elevation in the bottom navigation bar. I tried elevation property but it doesn't work. Elevation property has a very negligible shadow effect. But according to my design I want higher elevation.

I want the following output...

'

import 'package:flutter/material.dart';

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Text('Sample App'),
      ),
      bottomNavigationBar: BottomNavigationBar(
        elevation: 10,
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.ac_unit),
              title: Text('Test')
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.access_alarm),
              title: Text('Test')
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.access_alarm),
            title: Text('Test'),
          ),
        ],
      ),
    );
  }
}

Answer 1

I know it may not seem the best solution for this issue but you can wrap your Bottom Nav Bar inside a Container, and then apply a BoxDecoration on that.

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Text('Sample App'),
      ),
      bottomNavigationBar: Container(
        decoration: BoxDecoration(
          boxShadow: <BoxShadow>[
            BoxShadow(
              color: Colors.black,
              blurRadius: 10,
            ),
          ],
        ),
        child: BottomNavigationBar(
          elevation: 10,
          items: [
            BottomNavigationBarItem(
              icon: Icon(Icons.ac_unit),
              title: Text('Test'),
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.access_alarm),
              title: Text('Test'),
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.access_alarm),
              title: Text('Test'),
            ),
          ],
        ),
      ),
    );
  }
}

I hope someone come with a better solution for this issue.