[build] try multi-targeting .NET 8 and 9

Directory.Build.props

@@ -6,7 +6,7 @@
     <RepositoryCommit>$(BUILD_SOURCEVERSION)</RepositoryCommit>
 
     <!-- Default TFM's we build for -->
-    <_DefaultTargetFrameworks>net8.0-android</_DefaultTargetFrameworks>
+    <_DefaultTargetFrameworks>net8.0-android;net9.0-android</_DefaultTargetFrameworks>
     <_DefaultNetTargetFrameworks>net8.0</_DefaultNetTargetFrameworks>
 
     <!-- Enable DIM/SIM for Classic (defaults to true on .NET) -->
@@ -85,11 +85,14 @@
   <ItemGroup>
     <AndroidXNuGetTargetFolders Include="build\net8.0-android34.0" />
     <AndroidXNuGetTargetFolders Include="buildTransitive\net8.0-android34.0" />
+    <AndroidXNuGetTargetFolders Include="build\net9.0-android35.0" />
+    <AndroidXNuGetTargetFolders Include="buildTransitive\net9.0-android35.0" />
   </ItemGroup>
 
   <!-- Folders that _._ files need to go into for packages without managed libraries -->
   <ItemGroup>
     <AndroidXNuGetLibFolders Include="lib\net8.0-android34.0" />
+    <AndroidXNuGetLibFolders Include="lib\net9.0-android35.0" />
   </ItemGroup>
 
   <ItemGroup>

build/ci/build.yml

@@ -71,7 +71,7 @@ jobs:
     - ${{ if ne(parameters.use1ESTemplate, true) }}:
       - task: PublishPipelineArtifact@1
         displayName: Upload logs
+        condition: always()
         inputs:
           artifactName: output-${{ parameters.name }}
           targetPath: ${{ parameters.artifactsPath }}
-          condition: always()

build/ci/variables.yml

@@ -19,7 +19,7 @@ variables:
   macosAgentPoolName: VSEng-VSMac-Xamarin-Shared                                      # macOS VM pool name
 
   # Tool variables
-  dotnetVersion: '8.0.408'                                                              # .NET version to install on agent
+  dotnetVersion: '9.0.300'                                                              # .NET version to install on agent
   dotnetWorkloadRollbackFile: 'workloads.json'                                          # Rollback file specifying workload versions to install
   dotnetNuGetOrgSource: 'https://api.nuget.org/v3/index.json'                           # NuGet.org URL to find workloads
   dotnetWorkloadSource: 'https://aka.ms/dotnet6/nuget/index.json'                       # .NET engineering URL to find workloads

build/scripts/provision-android/provision-android.csproj

@@ -1,5 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>net8.0-android</TargetFramework>
+    <TargetFramework>net9.0-android</TargetFramework>
   </PropertyGroup>
+  <!-- Required for .NET 8 projects -->
+  <ItemGroup>
+    <AndroidDependency Include="platforms/android-34" />
+  </ItemGroup>
 </Project>

config.json

@@ -5204,7 +5204,7 @@
         "groupId": "androidx.emoji2",
         "artifactId": "emoji2",
         "version": "1.2.0",
-        "nugetVersion": "1.2.0.3",
+        "nugetVersion": "1.2.0.2",
         "nugetId": "Xamarin.AndroidX.Emoji2",
         "dependencyOnly": true,
         "comments": "Required by 'androidx.emoji2.emoji2-emojipicker:1.5.0'"

global.json

@@ -1,9 +1,4 @@
 {
-    "sdk": 
-    {
-        "version": "8.0.408",
-        "rollForward": "patch"
-    },
     "msbuild-sdks": 
     {
         "MSBuild.Sdk.Extras": "3.0.44",

source/_PackageLevelCustomizations.cshtml

@@ -60,7 +60,7 @@
    to the old behavior. Once we are .NET 9+ we should redo our hand bound code and remove this. *@
 @if (@Model.NuGetPackageId == "Xamarin.AndroidX.Media3.ExoPlayer" )
 {
-  <PropertyGroup Condition="$(TargetFramework.Contains('net8.0-android'))" >
+  <PropertyGroup Condition="$(TargetFramework.Contains('net8.0-android')) or $(TargetFramework.Contains('net9.0-android'))" >
     <_AndroidEmitLegacyInterfaceInvokers>true</_AndroidEmitLegacyInterfaceInvokers>
   </PropertyGroup>
 }

tests/Directory.Build.props

@@ -3,7 +3,7 @@
   which is tuned for building bindings packages. -->
   <PropertyGroup>
     <!-- Default TFM's we build for -->
-    <_DefaultTargetFrameworks>net8.0-android</_DefaultTargetFrameworks>
+    <_DefaultTargetFrameworks>net8.0-android;net9.0-android</_DefaultTargetFrameworks>
     <_DefaultNetTargetFrameworks>net8.0</_DefaultNetTargetFrameworks>
   </PropertyGroup>
 </Project>

workloads.json

@@ -1,10 +1,10 @@
 {
-  "microsoft.net.sdk.android": "34.0.154/8.0.100",
-  "microsoft.net.sdk.ios": "18.0.8319/8.0.100",
-  "microsoft.net.sdk.maccatalyst": "18.0.8319/8.0.100",
-  "microsoft.net.sdk.macos": "15.0.8319/8.0.100",
-  "microsoft.net.sdk.maui": "8.0.100/8.0.100",
-  "microsoft.net.sdk.tvos": "18.0.8319/8.0.100",
-  "microsoft.net.workload.mono.toolchain.current": "8.0.15/8.0.100",
-  "microsoft.net.workload.emscripten.current": "8.0.15/8.0.100"
+  "microsoft.net.sdk.android": "35.0.61/9.0.100",
+  "microsoft.net.sdk.ios": "18.4.9288/9.0.100",
+  "microsoft.net.sdk.maccatalyst": "18.4.9288/9.0.100",
+  "microsoft.net.sdk.macos": "15.4.9288/9.0.100",
+  "microsoft.net.sdk.maui": "9.0.51/9.0.100",
+  "microsoft.net.sdk.tvos": "18.4.9288/9.0.100",
+  "microsoft.net.workload.mono.toolchain.current": "9.0.5/9.0.100",
+  "microsoft.net.workload.emscripten.current": "9.0.5/9.0.100"
 }