无法加载资产

Question

这是我的 pubspec.yaml 文件

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/m1.jpg
  - assets/m2.jpg
  - assets/m3.jpg
  - assets/m4.jpg
  - assets/cat/m13.jpg

除了这张图片，上面的图片都有效

         - assets/cat/m13.jpg

我在 pubspec.yaml 文件中没有收到错误，并且 运行 "flutter packages get" 给出了退出代码 0。

在HorizontalListView.dart我有关注class

                  class _HorizontalListViewState extends State<HorizontalListView> {
  @override
  Widget build(BuildContext context) {
    return Container(
      height: 80.0,
      child: ListView(
        scrollDirection: Axis.horizontal,
        children: <Widget>[
          Category(
            image_location: " assets/cat/m13.jpg",
            image_caption: "shirts",
          ),
        ],
      ),
    );
  }
}

我遇到的错误是

                    The following assertion was thrown resolving an image codec:
I/flutter (17029): Unable to load asset:  assets/cat/m13.jpg
I/flutter (17029):
I/flutter (17029): When the exception was thrown, this was the stack:
I/flutter (17029): #0      PlatformAssetBundle.load (package:flutter/src/services/asset_bundle.dart:221:7)
I/flutter (17029): <asynchronous suspension>
I/flutter (17029): #1      AssetBundleImageProvider._loadAsync (package:flutter/src/painting/image_provider.dart:484:44)
I/flutter (17029): #2      AssetBundleImageProvider.load (package:flutter/src/painting/image_provider.dart:469:14)
I/flutter (17029): #3      ImageProvider.resolve.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:flutter/src/painting/image_provider.dart:327:17)
I/flutter (17029): #4      ImageCache.putIfAbsent (package:flutter/src/painting/image_cache.dart:160:22)
I/flutter (17029): #5      ImageProvider.resolve.<anonymous closure>.<anonymous closure> (package:flutter/src/painting/image_provider.dart:325:84)
I/flutter (17029): (elided 13 frames from package dart:async)
I/flutter (17029):
I/flutter (17029): Image provider: AssetImage(bundle: null, name: " assets/cat/m13.jpg")
I/flutter (17029): Image key: AssetBundleImageKey(bundle: PlatformAssetBundle#5adcb(), name: " assets/cat/m13.jpg",

提前致谢

Answer 1

您在 .yaml 文件上的资产实施失败。应该像下面这样

  assets:
     - assets/fuse.png
     - assets/not_found.png

或者执行文件夹中的所有文件；

  assets:
     - assets/

Answer 2

已解决

不正确

 assets:
 - assets/m1.jpg
 - assets/m2.jpg
 - assets/m3.jpg
 - assets/m4.jpg
 - assets/cat/m13.jpg

正确

assets:
  - assets/m1.jpg
  - assets/m2.jpg
  - assets/m3.jpg
  - assets/m4.jpg
  - assets/cat/m13.jpg

Answer 3

正确检查文件夹名称、图像文件名和图像扩展名。我相信是否已加载所有其他图像，只有一张除外。 然后

不正确：

资产：

• assets/m1.jpg
• assets/m2.jpg
• assets/m3.jpg
• assets/m4.jpg
• assets/cat/m13.jpg

正确：

资产：

• assets/m1.jpg
• assets/m2.jpg
• assets/m3.jpg
• assets/m4.jpg
• assets/validFolderName/validImageName.validExtension

例如：assets/cats/m13.jpg 或 assets/cat/m134.jpg 或 assets/cat/m13.png