从 2.8.1 升级到 Flutter 3.0,得到:Warning: Operand of null-aware operation '?.'具有排除空错误的“PaintingBinding”类型
它在 binding.dart
上——一个我根本不碰的文件。
() => PaintingBinding.instance?.imageCache?.evict(key),
^
你们有没有机会知道我该如何解决它?
不知道是否相关,但也经常看到:
Class 'kotlin.Unit' was compiled with an incompatible version
使用此处的指南进行迁移:https://github.com/flutter/flutter/wiki/Upgrading-pre-1.12-Android-projects
这是我的发布规范:
environment:
sdk: '>=2.12.0 <3.0.0'
dependencies:
flutter:
sdk: flutter
flutter_localizations:
sdk: flutter
google_maps_flutter: ^2.0.6
rxdart:
shimmer:
cupertino_icons: ^1.0.3
dependencies:
flutter_svg: ^1.0.0
http: ^0.13.3
flutter_spinkit: ^5.0.0
url_launcher: ^6.0.9
html: ^0.15.0
cached_network_image: ^3.1.0
collection: ^1.15.0
share_plus: ^3.0.4
flutter_native_splash: ^1.3.2
dev_dependencies:
flutter_test:
sdk: flutter
flutter_launcher_icons: ^0.9.2
flutter_icons:
android: true
ios: true
image_path: "assets/app/launch/ic_launcher.png"
adaptive_icon_padding: true
# 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.
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
最佳答案
所以,一些对我有帮助的事情:
flutter pub upgrade
然后尝试运行你的项目 ?
关于flutter - 从 2.8.1 升级到 Flutter 3.0,得到 : Warning: Operand of null-aware operation '?.' has type 'PaintingBinding' which excludes null error,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/72222750/
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