Xamarin Android：在应用程序中包含本机库时出错


Xamarin Android: Error including native library in application

我正在尝试将本机库导入我的 Xamarin Android 应用程序。我已经构建了 test.so 文件，并且包含了适当的 Dllopen 代码。问题是当我尝试部署应用程序时，我不断收到"DllImport error loading library"错误。这是完整的错误。

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> DllImport attempting to load: 'test'. 07-20 11:07:26.428 D/Mono  
> (11429): DllImport error loading library
> '/storage/emulated/0/Android/data/XammarinDemo.XammarinDemo/files/.__override__/libtest':
> 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm//storage/emulated/0/Android/data/XammarinDemo.XammarinDemo/files/.__override__/libtest"
> not found'. 07-20 11:07:26.428 D/Mono    (11429): DllImport error
> loading library
> '/storage/emulated/0/Android/data/XammarinDemo.XammarinDemo/files/.__override__/libtest.so':
> 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm//storage/emulated/0/Android/data/XammarinDemo.XammarinDemo/files/.__override__/libtest.so"
> not found'. 07-20 11:07:26.428 D/Mono    (11429): DllImport error
> loading library '/system/lib/libtest': 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm//system/lib/libtest"
> not found'. 07-20 11:07:26.428 D/Mono    (11429): DllImport error
> loading library '/system/lib/libtest.so': 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm//system/lib/libtest.so"
> not found'. 07-20 11:07:26.428 D/Mono    (11429): DllImport error
> loading library 'libtest': 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm/libtest" not found'.
> 07-20 11:07:26.428 D/Mono    (11429): DllImport error loading library
> 'libtest.so': 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm/libtest.so" not found'.
> 07-20 11:07:26.428 D/Mono    (11429): DllImport error loading library
> 'test': 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm/test" not found'. 07-20
> 11:07:26.438 D/Mono    (11429): DllImport error loading library
> '/storage/emulated/0/Android/data/XammarinDemo.XammarinDemo/files/.__override__/libtest':
> 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm//storage/emulated/0/Android/data/XammarinDemo.XammarinDemo/files/.__override__/libtest"
> not found'. 07-20 11:07:26.438 D/Mono    (11429): DllImport error
> loading library
> '/storage/emulated/0/Android/data/XammarinDemo.XammarinDemo/files/.__override__/libtest.so':
> 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm//storage/emulated/0/Android/data/XammarinDemo.XammarinDemo/files/.__override__/libtest.so"
> not found'. 07-20 11:07:26.438 D/Mono    (11429): DllImport error
> loading library '/system/lib/libtest': 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm//system/lib/libtest"
> not found'. 07-20 11:07:26.438 D/Mono    (11429): DllImport error
> loading library '/system/lib/libtest.so': 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm//system/lib/libtest.so"
> not found'. 07-20 11:07:26.438 D/Mono    (11429): DllImport error
> loading library 'libtest': 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm/libtest" not found'.
> 07-20 11:07:26.438 D/Mono    (11429): DllImport error loading library
> 'libtest.so': 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm/libtest.so" not found'.
> 07-20 11:07:26.438 D/Mono    (11429): DllImport error loading library
> 'libtest': 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm/libtest" not found'.
> 07-20 11:07:26.438 W/Mono    (11429): DllImport unable to load library
> 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm/libtest" not found'.
> 07-20 11:07:26.438 D/Mono    (11429): DllImport attempting to load:
> 'test'. 07-20 11:07:26.438 D/Mono    (11429): DllImport error loading
> library
> '/storage/emulated/0/Android/data/XammarinDemo.XammarinDemo/files/.__override__/libtest':
> 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm//storage/emulated/0/Android/data/XammarinDemo.XammarinDemo/files/.__override__/libtest"
> not found'. 07-20 11:07:26.438 D/Mono    (11429): DllImport error
> loading library
> '/storage/emulated/0/Android/data/XammarinDemo.XammarinDemo/files/.__override__/libtest.so':
> 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm//storage/emulated/0/Android/data/XammarinDemo.XammarinDemo/files/.__override__/libtest.so"
> not found'. 07-20 11:07:26.438 D/Mono    (11429): DllImport error
> loading library '/system/lib/libtest': 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm//system/lib/libtest"
> not found'. 07-20 11:07:26.438 D/Mono    (11429): DllImport error
> loading library '/system/lib/libtest.so': 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm//system/lib/libtest.so"
> not found'. 07-20 11:07:26.438 D/Mono    (11429): DllImport error
> loading library 'libtest': 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm/libtest" not found'.
> 07-20 11:07:26.438 D/Mono    (11429): DllImport error loading library
> 'libtest.so': 'dlopen failed: library
>"/data/app/XammarinDemo.XammarinDemo-1/lib/arm/libtest.so" not found'.

我按照 https://developer.xamarin.com/guides/android/advanced_topics/using_native_libraries/ 此处所述的流程进行操作。我通过解压缩确认 libtest.so 包含在 apk 中，但似乎 android 在定位 .so 文件时遇到问题。我该如何解决这个问题？

相关讨论

根据您提到的 xamarin 文档，您可以使用路径嗅探或项目文件让链接器知道什么是什么。

现在，路径嗅探不适用于 Visual Studio。您的 dll 将放在名为 ARM、ARM64 等的目录中。路径"嗅探器"期望路径类似于 armeabi、armeabi-v7a 等。您可以更改每个平台的输出路径，或更改您的项目文件。

如果您选择项目文件(应在外部编辑器中手动编辑)，结果应如下所示：

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<ItemGroup>
<EmbeddedNativeLibrary Include="..\\CD.AndroidDll\
elease\\ARM64\\libDemo.so">
  <Link>lib\\arm64\\libDemo.so</Link>
  <ABI>arm64-v8a</ABI>
  <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</EmbeddedNativeLibrary>
<EmbeddedNativeLibrary Include="..\\CD.AndroidDll\
elease\\ARM\\libDemo.so">
  <Link>lib\\arm\\libDemo.so</Link>
  <ABI>armeabi-v7a</ABI>
  <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</EmbeddedNativeLibrary>
<EmbeddedNativeLibrary Include="..\\CD.AndroidDll\
elease\\x64\\libDemo.so">
  <Link>lib\\x64\\libDemo.so</Link>
  <ABI>x86_64</ABI>
  <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</EmbeddedNativeLibrary>
<EmbeddedNativeLibrary Include="..\\CD.AndroidDll\
elease\\x86\\libDemo.so">
  <Link>lib\\x86\\libDemo.so</Link>
  <ABI>x86</ABI>
  <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</EmbeddedNativeLibrary>
<None Include="Resources\\AboutResources.txt" />

剩下的唯一问题是 armeabi 与 armeabi-v7a。该应用程序似乎没有查看 armeabi-v7a 设备上的 armeabi 文件夹。如果将两个 ABI 定义添加到同一个链接库，则仅使用第二个。您也不能将同一个文件链接两次。

您唯一的选择是手动复制库并添加它。或者干脆把 armeabi 排除在外。毕竟，你现在很难找到不支持 armeabi-v7a 的设备。