资产/appimage/test.png 在 PubSpec.yaml 中不存在警告

Question

请找到下面的代码主飞镖：

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")),
); 
}
}

Pubspec.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

在执行之前;资产资产/appimage/test.png 在 pubspec.yaml 中不存在警告 执行下面的代码后，异常即将到来

══╡ 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)

Answer 1

我的朋友..将您的资产文件夹移出lib文件夹->它是一个基于项目的文件夹..之后，您的代码将正常工作。 此外，在pubspec.yaml中，正如Aamil Silawat所说，让它assets/appimages/。

Answer 2

您可以简单地在pubspec.yaml文件中定义，如下所示 不需要定义.yaml file中的所有图像

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")),
); 
}
}

Answer 3

这对我有用

Pubspec.yaml

assets:
- lib/assets/images/

主飞镖

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

Answer 4

请参阅 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(该文件夹驻留在 lib 或任何其他文件夹中，它 id 不自由((在我的情况下发生了这种情况((

Answer 5

直接保存在库中，然后写下"lib/imagename".extension 为我工作。

如果这不起作用，请将您的频道更改为测试版。 ，然后重试。