Question

我正在构建一个颤动的应用程序，并且在手机上运行该应用程序时不会加载资产图片，但是当我在模拟器上运行该应用程序时，该资源图片可以正常加载。

这是我得到的错误：

> I/flutter (26364): ══╡ EXCEPTION CAUGHT BY IMAGE RESOURCE SERVICE
> ╞════════════════════════════════════════════════════ I/flutter
> (26364): The following assertion was thrown resolving an image codec:
> I/flutter (26364): Unable to load asset: images/diamond.png I/flutter
> (26364): I/flutter (26364): When the exception was thrown, this was
> the stack: I/flutter (26364): #0      PlatformAssetBundle.load
> (package:flutter/src/services/asset_bundle.dart:221:7) I/flutter
> (26364): <asynchronous suspension> I/flutter (26364): #1     
> AssetBundleImageProvider._loadAsync
> (package:flutter/src/painting/image_provider.dart:464:44) I/flutter
> (26364): <asynchronous suspension> I/flutter (26364): #2     
> AssetBundleImageProvider.load
> (package:flutter/src/painting/image_provider.dart:449:14) I/flutter
> (26364): #3      ImageProvider.resolve.<anonymous closure>.<anonymous
> closure>.<anonymous closure>
> (package:flutter/src/painting/image_provider.dart:316:48) I/flutter
> (26364): #4      ImageCache.putIfAbsent
> (package:flutter/src/painting/image_cache.dart:160:22) I/flutter
> (26364): #5      ImageProvider.resolve.<anonymous closure>.<anonymous
> closure> (package:flutter/src/painting/image_provider.dart:316:25)
> I/flutter (26364): (elided 13 frames from package dart:async)
> I/flutter (26364): I/flutter (26364): Image provider:
> AssetImage(bundle: null, name: "images/diamond.png") I/flutter
> (26364): Image key: AssetBundleImageKey(bundle:
> PlatformAssetBundle#5b025(), name: "images/diamond.png", I/flutter
> (26364):   scale: 1.0) I/flutter (26364):
> ════════════════════════════════════════════════════════════════════════════════════════════════════

这是我的pubspec.yaml

flutter:
  uses-material-design: true
  assets:
    - images/

这是main.dart：

导入“ package：flutter / material.dart”；

void main() {
  runApp(
    MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          backgroundColor: Colors.blueGrey[900],
          title: Text('Picture Motivation'),
        ),
        body: Center(
          child: Image(
            image: AssetImage('images/diamond.png'),
          ),
        ),
      ),
    ),
  );
}

非常令人困惑的是，为什么映像正确地加载在模拟器上而不是物理设备上。有任何线索吗？

非常感谢。

Answer 1

逐步执行此操作，这应该可以正常工作。基本上，您用错误的方式进行操作。

将图像放在资产文件夹中，所以根为assets/diamond.png

或者，如果资产文件夹中还有另一个文件夹images，则根目录为assets/images/diamond.png

pubspec.yaml

flutter:
   uses-material-design: true
   //you have to give the proper path in order to get the image in your UI
   assets: 
     - assets/images/diamond.png

UI代码：

//this is how your image calling work, you just have to copy the path, same as pubspec.yaml
Center(
   child: Image(
      image: AssetImage('assets/images/diamond.png'),
   )
)

我确信您现在将能够获得图像。让我知道是否有帮助。

Flutter无法在物理设备上加载图像资产（但可以在模拟器上很好地加载）

1 个答案: