How to add Floating action Button in Bottom Navigation Bar in Center with border?

Question

I am trying to add a Floating Action Button in the middle of the Bottom Navigation bar. Problem is border is not appearing and also margin in Floating Action Button and icons no

Answer 1

Here is a crystal clear official demonstration : https://youtu.be/2uaoEDOgk_I

Code will be something like this:

Scaffold(..
  floatingActionButton..
  bottomNavigationBar..
    floatingActionButtonLocation: FloatingActionButtonLocation.endDocked

Answer 2

There are many possible solutions, one of them is to add padding and border.

import 'package:charts_flutter/flutter.dart' as prefix0;
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: Scaffold(
        backgroundColor: Colors.blueAccent,
        floatingActionButton: Padding(
          padding: EdgeInsets.only(top: 20),
          child: SizedBox(
            height: 70,
            width: 70,
            child: FloatingActionButton(
              backgroundColor: Colors.transparent,
              elevation: 0,
              onPressed: () {},
              child: Container(
                height: 70,
                width: 70,
                decoration: BoxDecoration(
                  border: Border.all(color: Colors.white, width: 4),
                  shape: BoxShape.circle,
                  gradient: LinearGradient(
                    begin: const Alignment(0.7, -0.5),
                    end: const Alignment(0.6, 0.5),
                    colors: [
                      Color(0xFF53a78c),
                      Color(0xFF70d88b),
                    ],
                  ),
                ),
                child: Icon(Icons.photo_camera, size: 30),
              ),
            ),
          ),
        ),
        floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
        bottomNavigationBar: BottomAppBar(
          color: Colors.white,
          child: Container(
            height: 80,
            color: Colors.white,
          ),
        ),
      ),
    );
  }
}