更新Firebase.Messaging.Service NuGet后Xamarin Android构建失败：无法解析DrawableWrapper

问题场景 #

更新Xamarin Android项目的Firebase.Messaging.Service NuGet包后，出现XALNK7000链接错误，使用Visual Studio 2022 17.5.4，目标Android 13，构建日志如下：

C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000: Mono.Linker.MarkException: Error processing method: 'System.Void Xamarin.Forms.Platform.Android.ShellSearchView/ClipDrawableWrapper::.ctor(Android.Graphics.Drawables.Drawable)' in assembly: 'Xamarin.Forms.Platform.Android.dll' ---> Mono.Cecil.ResolutionException: Failed to resolve AndroidX.AppCompat.Graphics.Drawable.DrawableWrapper
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at Mono.Linker.Steps.MarkStep.HandleUnresolvedType(TypeReference reference)
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at Mono.Linker.Steps.MarkStep.MarkType(TypeReference reference)
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at MonoDroid.Tuner.MonoDroidMarkStep.MarkType(TypeReference reference)
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at Mono.Linker.Steps.MarkStep.MarkType(TypeReference reference)
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at MonoDroid.Tuner.MonoDroidMarkStep.MarkType(TypeReference reference)
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at Mono.Linker.Steps.MarkStep.ProcessMethod(MethodDefinition method)
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at Mono.Linker.Steps.MarkStep.ProcessQueue()
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    --- End of inner exception stack trace ---
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at Mono.Linker.Steps.MarkStep.ProcessQueue()
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at Mono.Linker.Steps.MarkStep.ProcessPrimaryQueue()
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at Mono.Linker.Steps.MarkStep.Process()
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at Mono.Linker.Steps.MarkStep.Process(LinkContext context)
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at MonoDroid.Tuner.MonoDroidMarkStep.Process(LinkContext context)
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at Mono.Linker.Pipeline.ProcessStep(LinkContext context, IStep step)
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at Mono.Linker.Pipeline.Process(LinkContext context)
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at MonoDroid.Tuner.Linker.Process(LinkerOptions options, ILogger logger, LinkContext& context)
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at Xamarin.Android.Tasks.LinkAssemblies.Execute(DirectoryAssemblyResolver res)
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at Xamarin.Android.Tasks.LinkAssemblies.RunTask()
5>C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Legacy.targets(649,5): error XALNK7000:    at Microsoft.Android.Build.Tasks.AndroidTask.Execute() in /Users/runner/work/1/s/xamarin-android/external/xamarin-android-tools/src/Microsoft.Android.Build.BaseTasks/AndroidTask.cs:line 17
========== Rebuild All: 4 succeeded, 1 failed, 0 skipped ==========

错误原因 #

更新Firebase.Messaging.Service后，引入的AndroidX依赖版本与现有Xamarin.Forms依赖的AndroidX.AppCompat版本不兼容，导致链接器无法找到AndroidX.AppCompat.Graphics.Drawable.DrawableWrapper类型。

解决方案 #

• 更新Xamarin.Forms到兼容版本：打开NuGet包管理器，将Xamarin.Forms更新至支持Android 13的最新稳定版，确保所有项目（包括共享项目和Android项目）的Xamarin.Forms版本一致。
• 统一AndroidX依赖版本：检查项目中所有AndroidX相关NuGet包（尤其是AndroidX.AppCompat），将它们更新到相同的稳定版本，避免版本冲突。
• 调整链接器行为（临时方案）：右键Android项目 → 属性 → Android选项 → 链接器设置，将链接行为改为Sdk程序集仅或不链接，重新构建项目（注意：此方案会增大APK体积，仅作临时测试，最终需解决依赖问题）。
• 清理重建项目：执行生成→清理解决方案，删除项目目录下的bin和obj文件夹，再重新生成解决方案。

内容的提问来源于stack exchange，提问作者Siddhant maurya