image - flutter : Unable to load image asset

Question

这是我第一次使用 flutter，遵循文档中描述的所有内容并向小部件添加图像。但我收到此错误，我不明白出了什么问题

Am tried this way

@override
  Widget build(BuildContext context) {
    return Container(
      child: Image.asset("drawables/ic_launcher_transparent.png", width : 100, height: 100),
    );
  }

• 文件结构
  |-- 库
  |--- 可绘制
  |----- ic_launcher_transparent.png
  

• pubspec.yaml
  使用 Material 设计:true
  Assets :
  - 绘图
  

Am getting this error

════════ Exception caught by image resource service ════════════════════════════════════════════════
The following assertion was thrown resolving an image codec:
Unable to load asset: drawables/ic_launcher_transparent.png

When the exception was thrown, this was the stack: 
#0      PlatformAssetBundle.load (package:flutter/src/services/asset_bundle.dart:225:7)
<asynchronous suspension>
#1      AssetBundleImageProvider._loadAsync (package:flutter/src/painting/image_provider.dart:668:31)
#2      AssetBundleImageProvider.load (package:flutter/src/painting/image_provider.dart:651:14)
#3      ImageProvider.resolveStreamForKey.<anonymous closure> (package:flutter/src/painting/image_provider.dart:504:13)
...
Image provider: AssetImage(bundle: null, name: "drawables/ic_launcher_transparent.png")
Image key: AssetBundleImageKey(bundle: PlatformAssetBundle#59d28(), name: "drawables/ic_launcher_transparent.png", scale: 1.0)
════════════════════════════════════════════════════════════════════════════════════════════════════

Answer 1

该文件位于 lib 文件夹内。所以你需要在url中链接lib。检查下面。

@override
  Widget build(BuildContext context) {
    return Container(
      child: Image.asset("lib/drawables/ic_launcher_transparent.png", width : 100, height: 100),
  );
}

Pubspec 将如下所示。

• pubspec.yaml
  使用 Material 设计:true
  Assets :
  - lib/drawables/