扑包拿到失败

Question

当我尝试添加firebase_auth，并运行flutter packages get我得到了我下面的错误

Running "flutter packages get" in demo... 
demo firebase_auth has no versions that match >=0.2.3 <0.3.0 derived from: 
- demo depends on version ^0.2.3 

我不完全相信我应该怎么做才能解决这个问题。

name: full3 
description: A new Flutter project. 

dependencies: 
    flutter: 
     path: C:\flutter\packages\flutter 
    google_sign_in: "^0.3.1" 
    firebase_auth: "^0.2.3" 

# 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: 
    fonts: 
     - family: Encode Sans 
      fonts: 
      - asset: assets/fonts/EncodeSansExpanded-Light.ttf 

    assets: 
    - assets/img/facebook.png 
    - assets/img/google.png 
    - assets/img/logo.png 
    - assets/img/signup.png 

    # The following line ensures that the Material Icons font is 
    # included with your application, so that you can use the icons in 
    # the Icons class. 
    uses-material-design: true 
    # To add assets to your application, add an assets section here, in 
    # this "flutter" section, as in: 
    # assets: 
    # - images/a_dot_burr.jpeg 
    # - images/a_dot_ham.jpeg 

    # To add assets from package dependencies, first ensure the asset 
    # is in the lib/ directory of the dependency. Then, 
    # refer to the asset with a path prefixed with 
    # `packages/PACKAGE_NAME/`. Note: the `lib/` is implied, do not 
    # include `lib/` in the asset path. 
    # 
    # Here is an example: 
    # 
    # assets: 
    # - packages/PACKAGE_NAME/path/to/asset 

    # 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 

Answer 1

这对我来说工作得很好。
我刚更改了flutter依赖项。
如果这对您不适用，您的Flutter设置可能存在问题。

name: full3 
description: A new Flutter project. 

dependencies: 
    flutter: 
    sdk: flutter 
    google_sign_in: "^0.3.1" 
    firebase_auth: "^0.2.3" 

# 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: 
    fonts: 
     - family: Encode Sans 
      fonts: 
      - asset: assets/fonts/EncodeSansExpanded-Light.ttf 

    assets: 
    - assets/img/facebook.png 
    - assets/img/google.png 
    - assets/img/logo.png 
    - assets/img/signup.png 

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