I was playing with the new Material 3 styles in Flutter and got some errors. The code I wanted to test was: Flutter>material>IconButton class using IconButton.filled() raised error on my project so I recreated the sample on my PC but still got the same issue. I recreated this code with this command:
flutter create --sample=material.IconButton.3 mysample
Here is code:
import 'package:flutter/material.dart';
/// Flutter code sample for [IconButton].
void main() {
runApp(const IconButtonApp());
}
class IconButtonApp extends StatelessWidget {
const IconButtonApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData(
colorSchemeSeed: const Color(0xff6750a4), useMaterial3: true),
title: 'Icon Button Types',
home: const Scaffold(
body: ButtonTypesExample(),
),
);
}
}
class ButtonTypesExample extends StatelessWidget {
const ButtonTypesExample({super.key});
@override
Widget build(BuildContext context) {
return const Padding(
padding: EdgeInsets.all(4.0),
child: Row( // Here I get different Error (Error 1). (not sure if this relates to this issue)
children: <Widget>[
Spacer(),
ButtonTypesGroup(enabled: true),
ButtonTypesGroup(enabled: false),
Spacer(),
],
),
);
}
}
class ButtonTypesGroup extends StatelessWidget {
const ButtonTypesGroup({super.key, required this.enabled});
final bool enabled;
@override
Widget build(BuildContext context) {
final VoidCallback? onPressed = enabled ? () {} : null;
return Padding(
padding: const EdgeInsets.all(4.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
IconButton(
icon: const Icon(Icons.filter_drama), onPressed: onPressed),
// Filled icon button
IconButton.filled( // Error (Error 2)
onPressed: onPressed, icon: const Icon(Icons.filter_drama)),
// Filled tonal icon button
IconButton.filledTonal( // Error (Error 2)
onPressed: onPressed, icon: const Icon(Icons.filter_drama)),
// Outlined icon button
IconButton.outlined( // Error (Error 2)
onPressed: onPressed, icon: const Icon(Icons.filter_drama)),
],
),
);
}
}
Error 1: The constructor being called isn't a const constructor. Try removing 'const' from the constructor invocation.dart(const_with_non_const)
Error 2: The method 'filled' isn't defined for the type 'IconButton'. Try correcting the name to the name of an existing method, or defining a method named 'filled'.dart(undefined_method)
pubspec.yaml:
name: mysample
description: A new Flutter project.
# The following line prevents the package from being accidentally published to
# pub.dev using `flutter pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev
# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number is used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
# In Windows, build-name is used as the major, minor, and patch parts
# of the product and file versions while build-number is used as the build suffix.
version: 1.0.0+1
environment:
sdk: '>=2.19.6 <3.0.0'
# Dependencies specify other packages that your package needs in order to work.
# To automatically upgrade your package dependencies to the latest versions
# consider running `flutter pub upgrade --major-versions`. Alternatively,
# dependencies can be manually updated by changing the version numbers below to
# the latest version available on pub.dev. To see which dependencies have newer
# versions available, run `flutter pub outdated`.
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: ^1.0.2
dev_dependencies:
flutter_test:
sdk: flutter
# The "flutter_lints" package below contains a set of recommended lints to
# encourage good coding practices. The lint set provided by the package is
# activated in the `analysis_options.yaml` file located at the root of your
# package. See that file for information about deactivating specific lint
# rules and activating additional ones.
flutter_lints: ^2.0.0
# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec
# The following section is specific to Flutter packages.
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
# An image asset can refer to one or more resolution-specific "variants", see
# https://flutter.dev/assets-and-images/#resolution-aware
# For details regarding adding assets from package dependencies, see
# https://flutter.dev/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.dev/custom-fonts/#from-packages
flutter doctor:
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.7.10, on macOS 13.3.1 22E772610a
darwin-arm64, locale en-JP)
[✓] Android toolchain - develop for Android devices (Android SDK version
33.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 14.2)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2021.2)
[✓] VS Code (version 1.78.2)
[✓] Connected device (3 available)
[✓] HTTP Host Availability
• No issues found!
