Error when loading an image from the assets - flutter

Question

I am trying to use a PNG file as an icon image.
I have an assets folder in the root of my project.
The file's path is assets/icons/Dumbbell.png.
I loaded my assets in the pubspec file:
flutter:
uses-material-design: true
assets:
- assets/icons/
And in a Stateful widget's state I'm trying to use it:
#override
Widget build(BuildContext context) {
return Scaffold(
...
bottomNavigationBar: BottomNavigationBar(
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(
title: Text('Workout'),
icon: Image.asset(
'assets/icons/Dumbbell.png',
),
),
],
),
);
}
I just can't make it work!
EDIT: I removed the const keyword and added another BottomNavigationBarItem and now everything is working perfectly!

Answer 1

To fix your issue, just remove the const keyword because your icon is not constant and also you need at least two BottomNavigationBarItem widgets to make it work:
items: [
BottomNavigationBarItem(
title: Text('Workout'),
icon: Image.asset(
'assets/icons/Dumbbell.png',
),
),
BottomNavigationBarItem(
title: Text('Another item'),
icon: Image.asset(
'assets/icons/Dumbbell.png',
),
),
],
More info here: https://api.flutter.dev/flutter/material/BottomNavigationBar-class.html

Answer 2

try this..
use ImageIcon class instead of Image.asset
bottomNavigationBar: BottomNavigationBar(
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: ImageIcon(AssetImage("assets/mascot.png")),
title: Text("workout"),
),
],
),

Answer 3

try again with this demo
Image(image: AssetImage('assets/images/intro_0.jpg'),fit: BoxFit.fitWidth,)
diegoveloper's words is right. and BottomNavigationBar need two more items.
those code worked:
bottomNavigationBar:BottomNavigationBar(
items: <BottomNavigationBarItem>[
BottomNavigationBarItem(
title: Text('Workout'),
icon: Image(image: AssetImage('assets/images/intro_0.jpg'),fit: BoxFit.fitWidth,),
),
BottomNavigationBarItem(
title: Text('Workout'),
icon: Image(image: AssetImage('assets/images/intro_0.jpg'),fit: BoxFit.fitWidth,),
),
],
),