Flutter 从 List 中获取 Image.Asset

Question

所以我想从一个列表中获取图像，其中包含为项目提供的图像的文件名，如下所示。

这是我们的清单：

const product = [
  {
    "assets": "pizza.png",
    "name": "Mathematics Tasks",
    "info": "Quiz on Module 3",
    "score": 20,
  },
  {
    "assets": "burger.png",
    "name": "Science Tasks",
    "info": "Quiz on Module 8",
    "score": 50,
  },
  {
    "assets": "fries.png",
    "name": "Technology Tasks",
    "info": "Activity on Module 2",
    "score": 5,
  },
  {
    "assets": "hotdog.png",
    "name": "Arts Tasks",
    "info": "Quiz on Module 3",
    "score": 20,
  },
];

以及我们如何通过以下代码获取每个人：

Image.asset("assets/${product['assets']}")

如上图所示，它不会显示它，但我们确信代码可以正常工作。我们甚至在 pubspec.yaml 文件中声明了它的位置，指向 assets 文件夹中的图像。我知道我们可以分别插入文件的名称，但我们认为如果我们将其保存在一个列表中以避免使事情过于复杂，它会更容易和更有条理。是如何完成的有问题还是变量是问题所在？

对于那些要求 pubspec.yaml 文件的人，这里是：

name: test_project
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 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: ">=2.12.0 <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# versions available, run `flutter pub outdated`.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: ^1.0.0

# 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.
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/

  # 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

不，在这种情况下我不使用其他文件夹，但如果必须，我会添加“资产/文件夹”。不添加使用的包，因为这并不完全使用包...

Answer 1

试试这个

在您的项目中，在资产文件夹中创建一个名为 assets 的文件夹，在其中创建另一个名为 png 的文件夹。

所以安排将是

assets
   |__ png

现在转到您的 pubspec.yaml 将路径添加到您的资产

assets:
    - assets/png/

现在您已完成添加它们，为此创建一个常量并将其命名为 image.dart，具体取决于您的名称。现在在 image.dart 中

const String? pizza = "assets/png/pizza.png";
const String? burger = "assets/png/burger.png";

类似的东西。

现在在您的列表中编辑那些喜欢这个并命名图像名称。

const product = [
  {
    "assets": pizza!,
    "name": "Mathematics Tasks",
    "info": "Quiz on Module 3",
    "score": 20,
  },
  {
    "assets": burger!,
    "name": "Science Tasks",
    "info": "Quiz on Module 8",
    "score": 50,
  }
];

现在最后当你打电话给他们时，它仍然像你一样打电话。

Image.asset(product[index]['assets'])

或

Image.asset(product['assets'])

我希望它可以帮助我通常这样做。