Xamarin Traditional Android 项目基于 Visual Studio 2017 但有错误

Question

我在 2-3 个月前创建了 xamarin traditinal android 项目，但我需要更新此项目，但出现错误；

Severity    Code    Description Project File    Line    Suppression State
Error       The "LinkAssemblies" task failed unexpectedly.
Java.Interop.Tools.Diagnostics.XamarinAndroidException: error XA2006: Could not resolve reference to 'System.Void Android.App.Activity::OnMultiWindowModeChanged(System.Boolean)' (defined in assembly 'Xamarin.Android.Support.Fragment, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null') with scope 'Mono.Android, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065'. When the scope is different from the defining assembly, it usually means that the type is forwarded. ---> Mono.Cecil.ResolutionException: Failed to resolve System.Void Android.App.Activity::OnMultiWindowModeChanged(System.Boolean)
   at Mono.Linker.Steps.MarkStep.MarkMethod(MethodReference reference)
   at Mono.Linker.Steps.MarkStep.MarkInstruction(Instruction instruction)
   at Mono.Linker.Steps.MarkStep.MarkMethodBody(MethodBody body)
   at Mono.Linker.Steps.MarkStep.ProcessMethod(MethodDefinition method)
   at Mono.Linker.Steps.MarkStep.ProcessQueue()
   at Mono.Linker.Steps.MarkStep.Process()
   at Mono.Linker.Steps.MarkStep.Process(LinkContext context)
   at MonoDroid.Tuner.MonoDroidMarkStep.Process(LinkContext context)
   at Mono.Linker.Pipeline.Process(LinkContext context)
   at MonoDroid.Tuner.Linker.Process(LinkerOptions options, LinkContext& context)
   at Xamarin.Android.Tasks.LinkAssemblies.Execute(DirectoryAssemblyResolver res)
   --- End of inner exception stack trace ---
   at Java.Interop.Tools.Diagnostics.Diagnostic.Error(Int32 code, Exception innerException, String message, Object[] args)
   at Xamarin.Android.Tasks.LinkAssemblies.Execute(DirectoryAssemblyResolver res)
   at Xamarin.Android.Tasks.LinkAssemblies.Execute()
   at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
   at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext() MHG.SozumSana.UI

Answer 1

在使用 visual studio 时检查链接器属性它主要设置为 "None" 您必须更改它。

并检查 TargetAndroidVersion。（在配置 GUI 中，标题为 "Compile using Android version:"）

Answer 2

error XA2006: Could not resolve reference to 'System.Void Android.App.Activity::OnMultiWindowModeChanged(System.Boolean)' (defined in assembly 'Xamarin.Android.Support.Fragment, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null') with scope 'Mono.Android, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065'.

请检查onMultiWindowModeChanged API, it is added in API level 24. As @MCZ suggested, this is a known issue。

您可以尝试这样更改设置：

此外，Android 7.0 需要 Android JDK 1.8，我想你可能已经安装了它，因为你可以更早地构建你的应用程序，请检查 Java Development Kit Location in Tools -> Options-> Xamarin of your VS2017.

Xamarin Traditional Android 项目基于 Visual Studio 2017 但有错误

Xamarin Traditional Android Project Build On Visual Studio 2017 But Have Error

c#

mono

android

xamarin.android

xamarin