[build] Add 'net6.0-android' TargetFramework. (#507)

Author: jpobst

Directory.Build.props

@@ -4,5 +4,11 @@
     <AndroidBoundInterfacesContainConstants>false</AndroidBoundInterfacesContainConstants>
     <AndroidBoundInterfacesContainTypes>false</AndroidBoundInterfacesContainTypes>
     <AndroidBoundInterfacesContainStaticAndDefaultInterfaceMethods>false</AndroidBoundInterfacesContainStaticAndDefaultInterfaceMethods>
+    
+    <!-- .NET 6+ generates Resource.designer.cs files for bindings projects which we do not want -->
+    <AndroidGenerateResourceDesigner>false</AndroidGenerateResourceDesigner>
+    
+    <!-- .NET 6+ packages support back to API-21 -->
+    <SupportedOSPlatformVersion>21</SupportedOSPlatformVersion>
   </PropertyGroup>
 </Project>

azure-pipelines.yaml

@@ -10,7 +10,7 @@ pr:
 variables:
   AndroidBinderatorVersion: 0.4.7
   AndroidXMigrationVersion: 1.0.8
-  DotNetVersion: 6.0.100-preview.7.21379.14
+  DotNetVersion: 6.0.100-rc.1.21458.32
   LegacyXamarinAndroidPkg: https://aka.ms/xamarin-android-commercial-d16-10-macos
   LegacyXamarinAndroidVsix: https://aka.ms/xamarin-android-commercial-d16-10-windows
   BUILD_NUMBER: $(Build.BuildNumber)
@@ -33,13 +33,20 @@ jobs:
     parameters:
       timeoutInMinutes: 240
       areaPath: 'DevDiv\Xamarin SDK\Android'
+      windowsAgentPoolName: android-win-2019
       initSteps:
         - task: UseDotNet@2
           displayName: install .NET $(DotNetVersion)
           inputs:
             version: $(DotNetVersion)
         - pwsh: |
             dotnet workload install android
+        - task: JavaToolInstaller@0
+          inputs:
+            versionSpec: '11'
+            jdkArchitectureOption: 'x64'
+            jdkSourceOption: 'PreInstalled'
+
       preBuildSteps:
         - pwsh: |
             dotnet tool uninstall --global Cake.Tool

source/AssemblyInfo.cs

@@ -6,6 +6,10 @@
 [assembly: AssemblyMetadata ("BUILD_NUMBER",    "{BUILD_NUMBER}")]
 [assembly: AssemblyMetadata ("BUILD_TIMESTAMP", "{BUILD_TIMESTAMP}")]
 
+#if !NETCOREAPP
 [assembly: Android.LinkerSafe]
+#endif
+
+[assembly: AssemblyMetadata ("IsTrimmable", "True")]
 
 [assembly: Android.App.UsesLibrary("org.apache.http.legacy", Required=false)]

source/GooglePlayServicesProject.cshtml

@@ -3,12 +3,13 @@
 @using System.Collections.Generic
 
 @{
-  var targetFrameworkMoniker = "MonoAndroid90";
+  var targetFrameworkMoniker = "monoandroid90";
+  var dotnetFrameworkMoniker = "net6.0-android31.0";
 }
 
 <Project Sdk="Xamarin.Legacy.Sdk">
   <PropertyGroup>
-    <TargetFramework>@(targetFrameworkMoniker)</TargetFramework>
+    <TargetFrameworks>@(targetFrameworkMoniker);@(dotnetFrameworkMoniker)</TargetFrameworks>
     <IsBindingProject>true</IsBindingProject>
     @if (!string.IsNullOrEmpty(Model.AssemblyName)) {
     <AssemblyName>@(Model.AssemblyName)</AssemblyName>
@@ -165,20 +166,22 @@
 
   <ItemGroup>
     <None Include="@(Model.NuGetPackageId).targets" Pack="True" PackagePath="build\@(targetFrameworkMoniker)" />
+    <None Include="@(Model.NuGetPackageId).targets" Pack="True" PackagePath="build\@(dotnetFrameworkMoniker)" />
   </ItemGroup>
 
   @if (@Model.NuGetPackageId == "Xamarin.GooglePlayServices.Basement")
   {
     <ItemGroup>
       <None Include="..\..\source\com.google.android.gms\play-services-basement\buildtasks\bin\$(Configuration)\Xamarin.GooglePlayServices.Tasks.dll" Pack="True" PackagePath="build\@(targetFrameworkMoniker)" />
+      <None Include="..\..\source\com.google.android.gms\play-services-basement\buildtasks\bin\$(Configuration)\Xamarin.GooglePlayServices.Tasks.dll" Pack="True" PackagePath="build\@(dotnetFrameworkMoniker)" />
     </ItemGroup>
   }
 
   @if (@Model.MavenArtifacts.Count > 0) {
   <ItemGroup>
     @foreach (var art in @Model.MavenArtifacts) {
       if (art.ProguardFile != null) {
-    <None Include="..\..\@(art.ProguardFile)" Pack="True" PackagePath="proguard\@(targetFrameworkMoniker)" />
+    <None Include="..\..\@(art.ProguardFile)" Pack="True" PackagePath="proguard" />
       }
     }
   </ItemGroup>
@@ -209,6 +212,7 @@
     @foreach (var art in @Model.MavenArtifacts) {
       if (1==2 && art.MavenArtifactPackaging == "aar") {
     <None Include="..\..\externals\@(art.MavenGroupId)\@(art.MavenArtifactId).aar" Pack="True" PackagePath="aar\@(targetFrameworkMoniker)" />
+    <None Include="..\..\externals\@(art.MavenGroupId)\@(art.MavenArtifactId).aar" Pack="True" PackagePath="aar\@(dotnetFrameworkMoniker)" />
       }
     }
   </ItemGroup>
@@ -270,7 +274,8 @@
       <PackageReference Include="Xamarin.Google.Dagger" Version="2.27.0" />
     }
 
-
+    <!-- Reference -->
+    <Reference Include="System.Net.Http" Condition=" '$(TargetFramework)' == '@(targetFrameworkMoniker)' " />
   </ItemGroup>
 
 

source/GooglePlayServicesTargets.cshtml

@@ -1,9 +1,6 @@
 @using System.Linq
 @using System.IO
 @using System.Xml.Linq
-@{
-  var targetFrameworkMoniker = "MonoAndroid90";
-}
 <?xml version="1.0" encoding="utf-8"?>
 @functions {
   public static void RemoveXmlns(XElement e)
@@ -27,7 +24,7 @@
   <ItemGroup>
     @foreach (var art in @Model.MavenArtifacts) {
       if (art.ProguardFile != null) {
-    <ProguardConfiguration Include="$(MSBuildThisFileDirectory)..\..\proguard\@(targetFrameworkMoniker)\proguard.txt" />
+    <ProguardConfiguration Include="$(MSBuildThisFileDirectory)..\..\proguard\proguard.txt" />
       }
     }
   </ItemGroup>