flutter 资产assets/appimage/test.png不存在pubspec.yaml中的警告

k5hmc34c 于 2022-12-24 发布在 Flutter

关注(0)|答案(5)|浏览(273)

请查找以下代码main. dart：

class MyHomePage extends StatelessWidget {
   MyHomePage({Key key, this.title}) : super(key: key); 
   final String title; 

   @override 
   Widget build(BuildContext context) {
      return Scaffold( 
         appBar: AppBar( title: Text(this.title), ), 
         body: Center( child: Image.asset("assets/smiley.png")),
      ); 
   }
}

- 出版物规范yaml**

name: product_app
description: A new Flutter project.

version: 1.0.0+1

environment:
  sdk: ">=2.1.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  cupertino_icons: ^0.1.2

dev_dependencies:
  flutter_test:
    sdk: flutter

flutter:

  uses-material-design: true

  assets:
    - assets/appimages/floppy.png
    - assets/appimages/iphone.png
    - assets/appimages/laptop.png
    - assets/appimages/pendrive.png
    - assets/appimages/pixel.png
    - assets/appimages/tablet.png

执行前;资产assets/appimage/test.png不存在pubspec. yaml中的警告执行以下代码后出现异常

══╡ EXCEPTION CAUGHT BY IMAGE RESOURCE SERVICE ╞══
I/flutter ( 8653): The following assertion was thrown while resolving an image:
    I/flutter ( 8653): Unable to load asset: AssetManifest.json
    I/flutter ( 8653): When the exception was thrown, this was the stack:
    I/flutter ( 8653): #0      PlatformAssetBundle.load (package:flutter/src/services/asset_bundle.dart:221:7)
    I/flutter ( 8653): <asynchronous suspension>
    I/flutter ( 8653): #1      AssetBundle.loadString (package:flutter/src/services/asset_bundle.dart:67:33)
    I/flutter ( 8653): #2      CachingAssetBundle.loadString (package:flutter/src/services/asset_bundle.dart:163:18)
    I/flutter ( 8653): #3      CachingAssetBundle.loadStructuredData (package:flutter/src/services/asset_bundle.dart:184:5)
    I/flutter ( 8653): #4      AssetImage.obtainKey (package:flutter/src/painting/image_resolution.dart:174:18)
    I/flutter ( 8653): #5      ImageProvider.resolve.<anonymous closure> (package:flutter/src/painting/image_provider.dart:318:15)
    I/flutter ( 8653): #9      ImageProvider.resolve (package:flutter/src/painting/image_provider.dart:315:16)
    I/flutter ( 8653): #10     _ImageState._resolveImage (package:flutter/src/widgets/image.dart:1010:20)
    I/flutter ( 8653): #11     _ImageState.didChangeDependencies (package:flutter/src/widgets/image.dart:967:5)
    I/flutter ( 8653): #12     StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4376:12)
    I/flutter ( 8653): #13     ComponentElement.mount (package:flutter/src/widgets/framework.dart:4201:5)
    I/flutter ( 8653): #14     Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14)

flutter

来源：https://stackoverflow.com/questions/59658458/the-asset-assets-appimage-test-png-does-not-exist-warning-in-pubspec-yaml

5条答案

按热度按时间

gcmastyq1#

我的朋友..把你的assets文件夹从lib文件夹中移出来-〉它是一个基于项目的文件夹..在那之后，你的代码就可以正常工作了。另外，在pubspec.yaml中，就像Aamil Silawat说的那样，把它变成assets/appimages/。

赞(0）回复(0）举报 2022-12-24

lstz6jyr2#

- 您可以在pubspec.yaml文件中简单地定义，如下所示。无需在.yaml file中定义所有图像**

assets:
- assets/appimages/    (it will include all images in your appimages folder)

class MyHomePage extends StatelessWidget {
   MyHomePage({Key key, this.title}) : super(key: key); 
   final String title; 

   @override 
   Widget build(BuildContext context) {
      return Scaffold( 
         appBar: AppBar( title: Text(this.title), ), 
         body: Center( child: Image.asset("assets/appimages/iphone.png")),
      ); 
   }
}

赞(0）回复(0）举报 2022-12-24

cl25kdpy3#

这对我很有效
pubspec.yaml

assets:
- lib/assets/images/

main.dart

Image.asset(
    'lib/assets/images/gato.jpg',
    fit: BoxFit.cover
  ),

赞(0）回复(0）举报 2022-12-24

jjhzyzn04#

请参见有时它显示**{您的图像文件夹}在您的lib文件夹之外（我的意思是它不在任何文件夹中）在文件资源管理器中，但如果您仔细查看（在编辑器资源管理器中）该文件夹位于lib或任何其他文件夹中，它ID不是空闲的（在我的情况下发生了这种情况）**

赞(0）回复(0）举报 2022-12-24

9nvpjoqh5#

直接保存到lib中，然后写“lib/imagename”。扩展名对我很有效。
如果这不起作用，然后改变你的渠道测试版，再试一次。

赞(0）回复(0）举报 2022-12-24

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flutter 资产assets/appimage/test.png不存在pubspec.yaml中的警告

5条答案

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