Flutter Image Picker 包不工作

Question

我正在使用 image_picker 0.5.2 包上传图片，在我将该依赖项添加到项目中后，我无法构建我的项目，出现如下所述的异常。 请帮帮我。

D8: Program type already present: android.support.v4.os.ResultReceiver$MyResultReceiver

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDebug'.
> com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/2.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/3.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/4.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/5.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/6.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/7.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/8.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/9.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/10.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/11.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/12.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/13.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/14.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/15.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/16.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/17.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/18.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/19.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/20.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/21.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/22.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/23.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/24.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/25.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/26.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/27.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/28.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/29.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/30.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/31.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/32.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/33.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/34.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/35.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/36.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/37.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/38.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/39.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/40.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/41.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/42.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/43.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/44.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/45.jar, /Users/harshavardhan/Workspace/cargill_flutter/build/app/intermediates/transforms/dexBuilder/debug/46.jar
  Learn how to resolve the issue at https://developer.android.com/studio/build/dependencies#duplicate_classes.
  Program type already present: android.support.v4.os.ResultReceiver$MyResultReceiver

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 22s
*******************************************************************************************
The Gradle failure may have been because of AndroidX incompatibilities in this Flutter app.
*******************************************************************************************
Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

Answer 1

Gradle 失败可能是因为此 Flutter 应用程序中的 AndroidX 不兼容。

正如您在跟踪中提到的，此错误是由于您的应用中的 AndroidX 不兼容造成的。 image_picker插件从版本0.5.0迁移到最新的 AndroidX 支持库。

为了让您的应用正常运行，您可以将您的应用迁移到 AndroidX ，或者如果您的应用依赖于任何其他尚未迁移到 AndroidX 的包，您可以将您的 image_picker 插件版本锁定为0.4.12+1 ，它使用较旧的支持库。

将此添加到您的pubspec.yaml以使用此插件的特定版本 -

image_picker: 0.4.12+1

更多关于这里的信息。

更新

您可以查看此答案以了解有关迁移到 AndroidX 的原因的解释。 另外，这个官方博客解释了关于 AndroidX 的一切。

希望这可以帮助！

Answer 2

您需要迁移到 AndroidX 才能使该特定版本的库正常工作。 按照此链接中的步骤继续迁移。

Answer 3

File _image;   

 final images=ImagePicker();
Future getImage()async {    
var Image=await images.getImage(source: ImageSource.camera); 
 setState(() {   
   _image=File(Image.path); 
});   } 

当您想使用存储image路径的_image时：

  Container( 
 height: 180, 
 width: 180,
     child: ClipRRect(child: _image==null?Center(child: Text('Please Upload a pic'),):Image.file(_image,fit: BoxFit.fill,),),

当您最初运行该程序时，_image 变量不包含图像路径，实际上该路径为空或 null，并且出现错误_image==null?Center(child: Text('Please Upload a pic'),):它告诉 flutter 如果路径为 null 且未选中显示我的手动消息，您将看到请在选择图像时在容器中上传图片 File(Image.path)； 将生成一个适当的路径，你的照片就会出现，谢谢，