获取构建错误使用Xamarin Extension for Visual Studio 2015 Preview创建Android应用程序

Question

I'm using recently released Visual Studio 2015 Preview along with Xamarian Studio 5.6.3(or 5.6.2) extension for Visual studio.

After Hours of downloading and installing all required software (all done successfully), I started developing Android Application in VS2015P, but every time I create blank Android application, I get this error, with no error code:

The "MergeApkRecipelists" task was not given a value for the required parameter "RecipeFiles".

Answer 1

Figured this out by looking at Xamarin's .targets files.

Short Version

You can either:

• Create an Android C++ library project and reference that from your Xamarin Android project

or

• Comment out the Import element defined in %PROGRAMFILES(x86)%\\MSBuild\\Xamarin\\Android\\Xamarin.Android.Common.After.targets. Note this will likely disable support for adding C++ project references to Xamarin Android projects.

Once you do one of those, your Xamarin Android project should build and run.

Long Version

First, note the error in the VS output window:

C:\\Program Files (x86)\\MSBuild\\Xamarin\\Android\\Xamarin.Android.Common\\ImportAfter\\Microsoft.Cpp.Android.targets(54,9): error MSB4044: The "MergeApkRecipelists" task was not given a value for the required parameter "RecipeFiles".

The Microsoft.Cpp.Android.targets file mentioned in the error looks to be all about supporting project references to C++ projects. In it, the element for the MergeApkRecipelists task looks like so:

<!-- language: lang-xml -->
<MergeApkRecipelists RecipeFiles="@(_NativeAndroidRecipeFiles)">
        ...
</MergeApkRecipelists>

The NativeAndroidRecipeFiles variable doesn't seem to be defined in the .targets files, so presumably it's being initialized by the build process. But since the .targets file seems to be aimed at supporting C++ project refs, I tried adding an Android C++ shared library project to my solution:

Then I referenced the C++ project from my Xamarin Android project, and voila! Building and running afterwards was successful.

But since it's pretty onerous to have to bring in a dummy lib, I also tracked down where Xamarin's Microsoft.Cpp.Android.targets file gets pulled in. This happens in the C:\\Program Files (x86)\\MSBuild\\Xamarin\\Android\\Xamarin.Android.Common.After.targets file, which has one Import element:

<!-- language: lang-xml -->
<Import Project="$(MSBuildThisFileDirectory)\Xamarin.Android.Common\ImportAfter\*"
        Condition="Exists('$(MSBuildThisFileDirectory)\Xamarin.Android.Common\ImportAfter')"/>

That brings in everything under %PROGRAMFILES(x86)\\MSBuild\\Xamarin\\Android\\Xamarin.Android.Common\\ImportAfter. Since the only item in that directory is the .targets file we want to exclude, this can be commented out without affecting anything else. But note that, since this .targets file appears to be part of support for referencing C++ projects from Xamarin Android projects, commenting this out presumably means that will no longer work properly.

With that Import statement commented out, the Xamarin Android project should build and run without any C++ references.

Answer 2

Just add the following condition on line 54 of the targets file at C:\\Program Files (x86)\\MSBuild\\Xamarin\\Android\\Xamarin.Android.Common\\ImportAfter\\Microsoft.Cpp.A‌​ndroid.targets:

<MergeApkRecipelists RecipeFiles="@(_NativeAndroidRecipeFiles)" Condition="'@(_NativeAndroidRecipeFiles)' != ''">

Note: this permanent fix will ship soon in the alpha channel.

Answer 3

Try to update Xamarin up to 3.9. Update

Answer 4

从http://developer.xamarin.com/releases/vs/xamarin.vs_3/xamarin.vs_3.9/更新Xamarin我做到了，它的工作原理。