当我将 Firebase 连接到我的 Flutter 项目时，出现错误

Question

您好，我想将 Firebase 连接到我的颤振应用。当我写代码时，我得到一个错误。

第 29 行第 3 列出错：应为“:”。 ╷ 29 │ # 以下 将 Cupertino Icons 字体添加到您的应用程序。 │ ^ ╵ 请更正 pubspec.yaml 文件 C:\Users\kludi\AndroidStudioProjects\flutter_app_sportkludik\pubspec.yaml

dependencies:
  flutter:
    sdk: flutter
    firebase_core: "0.5.2"

  $ flutter pub get

Answer 1

你添加了一个额外的空间

dependencies:
  flutter:
    sdk: flutter
  firebase_core: "0.5.2"

Answer 2

你有一个额外的空间

dependencies:
  flutter:
    sdk: flutter
  firebase_core: "0.5.2"

Answer 3

@xkxeeshankhan

name: flutter_app_sportkludik
description: A new Flutter application.

# 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: ">=2.7.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  firebase_core: "0.5.2"

  $ flutter pub get
  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.0

dev_dependencies:
  flutter_test:
    sdk: flutter
# 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

Answer 4

@xkxeeshankhan 是对的。空格在 pubspec.yaml 文件中很重要。在定义 firebase_core 包时请小心。而且，还有一件事，你不应该使用 (") 字符。它应该是这样的：

dependencies:
  flutter:
    sdk: flutter


  firebase_core: ^0.5.2

以下命令将不在 pubspec.yaml 文件中。您将在终端上运行它。

 flutter pub get