如何解决将 flutter 项目升级到 null-safety
我的应用现在在 Flutter SDK 1.22.6 上运行，这是我的 pubspec.yaml：
name: random-app
description: just random app.
# The following line prevents the package from being accidentally published to
# pub.dev using `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 used as CFBundLeversion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1
environment:
sdk: ">=2.8.3 <3.0.0"
Flutter: ^1.20.0
dependencies:
Flutter:
sdk: Flutter
google_mobile_ads: ^0.11.0
firebase_core: ^0.7.0
circular_reveal_animation: ^1.1.5
Flutter_localizations:
sdk: Flutter
# The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons.
dartx: ^0.5.0
cupertino_icons:
shared_preferences:
uuid:
Flutter_router:
font_awesome_Flutter:
firebase_auth: ^0.20.1
google_sign_in: ^4.5.9
firebase_storage: ^7.0.0
cloud_firestore: ^0.16.0+1
provider: ^4.3.3
intl:
geocoding: ^1.0.5
geolocator: ^6.2.1
chewie: ^0.12.2
Flutter_absolute_path: ^1.0.6
Flutter_spinkit: ^4.1.2+1
Flutter_auth_buttons:
find_dropdown: ^0.2.3
intl_phone_number_input: ^0.6.0
carousel_slider: ^3.0.0
jiffy: ^3.0.1
timeago: ^2.0.30
custom_switch: ^0.0.1
expandable_text: ^1.3.2
Flutter_typeahead: ^2.0.0
sliding_card: 0.1.2
cached_network_image: ^2.5.1
Flutter_svg: ^0.19.1
url_launcher: ^5.7.10
Flutter_easyloading: ^2.2.2
Flutter_local_notifications: ^4.0.1+2
scrollable_positioned_list: ^0.1.10
http: ^0.12.2
file_picker: ^2.1.7
connectivity: ^2.0.2
Flutter_colorpicker: ^0.3.5
#for the assets picker
wechat_assets_picker: ^4.2.2
wechat_camera_picker: ^1.3.1
camera: ^0.5.8
device_info: ^1.0.0
assets_audio_player: ^2.0.13+1
extended_image: ^1.1.2
path_provider: ^1.6.28
photo_manager: ^0.5.8
video_player: ^1.0.1
collection: ^1.14.13
#for posting gigs
async: ^2.4.2
get_it: ^5.0.6
provider_architecture: ^1.1.1+1
screenshot: ^0.3.0
pull_to_refresh: 1.6.3
dev_dependencies:
Flutter_test:
sdk: Flutter
Flutter_asset_generator: ^0.6.1
Flutter_native_splash: ^0.3.2
Flutter_native_splash:
image: assets/images/splash.png
android: true
ios: true
android_gravity: fill
ios_content_mode: sclaeAspectFill
# 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:
- assets/images/
- assets/svgs/light/
- assets/svgs/solid/
- assets/svgs/regular/
- assets/svgs/flaticon/
- languages/
# 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
将我的 Flutter SDK 升级到 2.0.0 并在终端中运行以下命令后：
Flutter pub outdated --mode=null-safety
为了检查我是否可以升级我的依赖项，我在终端中得到了这个：
Package Name Current Upgradable Resolvable Latest
direct dependencies:
assets_audio_player ✗2.0.13+1 - - ✓3.0.3+6
async ✗2.5.0-nullsafety.1 - - ✓2.8.1
cached_network_image ✗2.5.1 - - ✓3.1.0
camera ✗0.5.8+17 - - ✓0.8.1+5
carousel_slider ✗3.0.0 - - ✓4.0.0
chewie ✗0.12.2 - - ✓1.2.2
circular_reveal_animation ✗1.1.5 - - ✓2.0.0
cloud_firestore ✗0.16.0+1 - - ✓2.4.0
collection ✗1.15.0-nullsafety.3 - - ✓1.15.0
connectivity ✗2.0.2 - - ✓3.0.6
cupertino_icons ✗1.0.0 - - ✓1.0.3
custom_switch ✗0.0.1 - - ✗0.0.1
dartx ✗0.5.0 - - ✓0.7.1
device_info ✗1.0.0 - - ✓2.0.2
expandable_text ✗1.3.2 - - ✓2.2.0
extended_image ✗1.6.0 - - ✓4.1.0
file_picker ✗2.1.7 - - ✓3.0.3
find_dropdown ✗0.2.3 - - ✓1.0.1-beta.2
firebase_auth ✗0.20.1 - - ✓3.0.1
firebase_core ✗0.7.0 - - ✓1.4.0
firebase_storage ✗7.0.0 - - ✓10.0.1
Flutter_absolute_path ✗1.0.6 - - ✗1.0.6
Flutter_auth_buttons ✗0.10.0 - - ✗0.10.0
Flutter_colorpicker ✗0.3.5 - - ✓0.5.0
Flutter_easyloading ✗2.2.2 - - ✓3.0.0
Flutter_local_notifications ✗4.0.1+2 - - ✓7.0.0
Flutter_router ✗1.0.7 - - ✓1.1.0
Flutter_spinkit ✗4.1.2+1 - - ✓5.0.0
Flutter_svg ✗0.19.1 - - ✓0.22.0
Flutter_typeahead ✗2.0.0 - - ✓3.2.0
font_awesome_Flutter ✗8.12.0 - - ✓9.1.0
geocoding ✗1.0.5 - - ✓2.0.0
geolocator ✗6.2.1 - - ✓7.3.1
get_it ✗5.0.6 - - ✓7.2.0
google_mobile_ads ✗0.11.0+4 - - ✓0.13.2
google_sign_in ✗4.5.9 - - ✓5.0.5
http ✗0.12.2 - - ✓0.13.3
intl ✗0.16.1 - - ✓0.17.0
intl_phone_number_input ✗0.6.0 - - ✓0.7.0+2
jiffy ✗3.0.1 - - ✓4.1.0
path_provider ✗1.6.28 - - ✓2.0.2
photo_manager ✗0.5.8 - - ✓1.2.8
provider ✗4.3.3 - - ✓6.0.0-dev
provider_architecture ✗1.1.1+1 - - ✗1.1.1+1
pull_to_refresh ✗1.6.3 - - ✓2.0.0
screenshot ✗0.3.0 - - ✓1.2.3
scrollable_positioned_list ✗0.1.10 - - ✓0.2.0-nullsafety.0
shared_preferences ✗0.5.12+4 - - ✓2.0.6
sliding_card ✗0.1.2 - - ✗0.1.2
timeago ✗2.0.30 - - ✓3.1.0
url_launcher ✗5.7.10 - - ✓6.0.9
uuid ✗2.2.2 - - ✓3.0.4
video_player ✗1.0.1 - - ✓2.1.12
wechat_assets_picker ✗4.2.2 - - ✓6.0.0-dev.9
wechat_camera_picker ✗1.3.1 - - ✓2.3.0-dev.2
dev_dependencies:
Flutter_asset_generator ✗0.6.1 - - ✓1.0.0-nullsafety.0
Flutter_native_splash ✗0.3.2 - - ✓1.2.0
No resolution was found. Try running `Flutter pub upgrade --null-safety --dry-run` to explore why.
谁能告诉我为什么我在可解析列下看不到任何带有 ✓ 符号的包版本？
这是否意味着我不能同时迁移到空安全？
任何帮助将不胜感激。
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