[Flutter] How to add asset image in app bar as an action icon in Flutter application?

Problem I am trying to add a logout image icon in appbar of flutter screen. I have created a asset folder and created directories images/icons/ and placed icons in them. I have mentioned them in pubspec.yaml file. I tried to implement a asset image in appbar but its not working.

Code

pubspe.yaml


name: mtrack_notifications
description: Flutter application for MTrack Notifications

dependencies:
flutter:
sdk: flutter
# The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^0.1.2
http: ^0.11.3+16
shared_preferences: "^0.4.2"


dev_dependencies:
flutter_test:
sdk: flutter


# For information on the generic Dart part of this file, see the
# following page: https://www.dartlang.org/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:

# The following line ensures that the Material Icons font is
# included with your application, so that you can use the icons in
# the material Icons class.
uses-material-design: true

# To add assets to your application, add an assets section, like this:
# assets:
# - images/a_dot_burr.jpeg
# - images/a_dot_ham.jpeg
assets:
- assets/images/icons/like.png
- assets/images/icons/logout.png
# An image asset can refer to one or more resolution-specific "variants", see
# https://flutter.io/assets-and-images/#resolution-aware.

# For details regarding adding assets from package dependencies, see
# https://flutter.io/assets-and-images/#from-packages

# To add custom fonts to your application, add a fonts section here,
# in this "flutter" section. Each entry in this list should have a
# "family" key with the font family name, and a "fonts" key with a
# list giving the asset and other descriptors for the font. For
# example:
# fonts:
# - family: Schyler
# fonts:
# - asset: fonts/Schyler-Regular.ttf
# - asset: fonts/Schyler-Italic.ttf
# style: italic
# - family: Trajan Pro
# fonts:
# - asset: fonts/TrajanPro.ttf
# - asset: fonts/TrajanPro_Bold.ttf
# weight: 700
#
# For details regarding fonts from package dependencies,
# see https://flutter.io/custom-fonts/#from-packages


Click to see the IDE screenshot here

Appbar code




@override
Widget build(BuildContext context) {
//build a form widget using the form key we created above
return new Scaffold(
appBar: new AppBar(
title: new Text(StringRef.appName),
actions: [

new Center(
child:new Text(
userName,
textScaleFactor: 1.5,
style: new TextStyle(
fontSize: 12.0,
color: Colors.white,
),
)),
new IconButton(
icon: new Icon(Icons.close),
tooltip: 'Closes application',
onPressed: () => exit(0),
),

new IconButton(
icon: new Image.asset('images/icons/logout.png'),
tooltip: 'Closes application',
onPressed: () => exit(0),
),

],
),

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