fix: Android DesignTimeBuild issue with MsBuild.Sdk.Extras (#2137)

* fix: Android DesignTimeBuild issue with MsBuild.Sdk.Extras

* Fixing Resource.Designer issue

* Fixing ReactiveUI.Testing.csproj

* Fixing all projects that target MonoAndroid

cake.config

@@ -0,0 +1,7 @@
+[Paths]
+Tools=./tools
+Addins=./tools/Addins
+Modules=./tools/Modules
+
+[NuGet]
+UseInProcessClient=true

src/Directory.build.targets

@@ -28,6 +28,7 @@
   </PropertyGroup>
   <PropertyGroup Condition="$(TargetFramework.StartsWith('MonoAndroid'))">
     <DefineConstants>$(DefineConstants);MONO;ANDROID</DefineConstants>
+    <DesignTimeBuild>false</DesignTimeBuild>
   </PropertyGroup>
   <PropertyGroup Condition="$(TargetFramework.StartsWith('netcoreapp'))">
     <DefineConstants>$(DefineConstants);NETCOREAPP</DefineConstants>

src/ReactiveUI.AndroidSupport/ReactiveUI.AndroidSupport.csproj

@@ -6,7 +6,13 @@
     <PackageId>ReactiveUI.AndroidSupport</PackageId>
     <LangVersion>latest</LangVersion>
   </PropertyGroup>
-  
+
+  <Target Name="_RemoveNonExistingResgenFile" BeforeTargets="CoreCompile" Condition="'$(_SdkSetAndroidResgenFile)' == 'true' And '$(AndroidResgenFile)' != '' And !Exists('$(AndroidResgenFile)')">
+    <ItemGroup>
+      <Compile Remove="$(AndroidResgenFile)"/>
+    </ItemGroup>
+  </Target>
+
   <ItemGroup>
     <PackageReference Include="Xamarin.Android.Support.Animated.Vector.Drawable" Version="27.0.*" />
     <PackageReference Include="Xamarin.Android.Support.v4" Version="27.0.*" />

src/ReactiveUI.Events/ReactiveUI.Events.csproj

@@ -9,6 +9,12 @@
     <NoWarn>$(NoWarn);CS1570;CA1812</NoWarn>
   </PropertyGroup>
 
+  <Target Name="_RemoveNonExistingResgenFile" BeforeTargets="CoreCompile" Condition="'$(_SdkSetAndroidResgenFile)' == 'true' And '$(AndroidResgenFile)' != '' And !Exists('$(AndroidResgenFile)')">
+    <ItemGroup>
+      <Compile Remove="$(AndroidResgenFile)"/>
+    </ItemGroup>
+  </Target>
+
   <ItemGroup>
     <Compile Remove="*.cs" />
     <None Include="*.cs" />

src/ReactiveUI.Fody.Helpers/ReactiveUI.Fody.Helpers.csproj

@@ -13,6 +13,12 @@
     <IsPackable Condition=" '$(OS)' != 'Windows_NT' ">false</IsPackable>
     <LangVersion>latest</LangVersion>
   </PropertyGroup>
+  
+  <Target Name="_RemoveNonExistingResgenFile" BeforeTargets="CoreCompile" Condition="'$(_SdkSetAndroidResgenFile)' == 'true' And '$(AndroidResgenFile)' != '' And !Exists('$(AndroidResgenFile)')">
+    <ItemGroup>
+      <Compile Remove="$(AndroidResgenFile)"/>
+    </ItemGroup>
+  </Target>
 
   <ItemGroup>
     <PackageReference Include="Fody" Version="5.1.1" PrivateAssets="None" />
@@ -53,5 +59,5 @@
   <ItemGroup>
     <ProjectReference Include="..\ReactiveUI\ReactiveUI.csproj" />
     <ProjectReference Include="..\ReactiveUI.Fody\ReactiveUI.Fody.csproj" ReferenceOutputAssembly="False" />
-  </ItemGroup> 
+  </ItemGroup>
 </Project>

src/ReactiveUI.Testing/ReactiveUI.Testing.csproj

@@ -9,6 +9,12 @@
     <LangVersion>latest</LangVersion>
   </PropertyGroup>
   
+  <Target Name="_RemoveNonExistingResgenFile" BeforeTargets="CoreCompile" Condition="'$(_SdkSetAndroidResgenFile)' == 'true' And '$(AndroidResgenFile)' != '' And !Exists('$(AndroidResgenFile)')">
+    <ItemGroup>
+      <Compile Remove="$(AndroidResgenFile)"/>
+    </ItemGroup>
+  </Target>
+
   <ItemGroup>
     <PackageReference Include="Microsoft.Reactive.Testing" Version="4.1.6" />
     <ProjectReference Include="..\ReactiveUI\ReactiveUI.csproj" />

src/ReactiveUI.Uno/ReactiveUI.Uno.csproj

@@ -13,6 +13,12 @@
     <DefineConstants>HAS_UNO;WASM</DefineConstants>
   </PropertyGroup>
 
+  <Target Name="_RemoveNonExistingResgenFile" BeforeTargets="CoreCompile" Condition="'$(_SdkSetAndroidResgenFile)' == 'true' And '$(AndroidResgenFile)' != '' And !Exists('$(AndroidResgenFile)')">
+    <ItemGroup>
+      <Compile Remove="$(AndroidResgenFile)"/>
+    </ItemGroup>
+  </Target>
+
   <ItemGroup Condition=" !$(TargetFramework.StartsWith('uap')) ">
     <PackageReference Include="Uno.UI" Version="1.*" />
   </ItemGroup>

src/ReactiveUI/ReactiveUI.csproj

@@ -9,6 +9,12 @@
     <LangVersion>latest</LangVersion>
   </PropertyGroup>
 
+  <Target Name="_RemoveNonExistingResgenFile" BeforeTargets="CoreCompile" Condition="'$(_SdkSetAndroidResgenFile)' == 'true' And '$(AndroidResgenFile)' != '' And !Exists('$(AndroidResgenFile)')">
+    <ItemGroup>
+      <Compile Remove="$(AndroidResgenFile)"/>
+    </ItemGroup>
+  </Target>
+
   <ItemGroup>
     <Compile Remove="Platforms\**\*.cs" />
     <None Include="Platforms\**\*.cs" />