[One .NET] default $(TargetPlatformVersion) to 32

Currently, if you build with `net6.0-android` and leave off the
number, it defaults to API 31. Let's bump this to API 32, Android 12L.

I also fixed the `Inputs` of the `_GenerateSupportedPlatforms` target,
so it will rerun when `Configuration.props` changes.

We will likely need to coordinate the API level installed by various
Visual Studio installers.

Author: jonathanpeppers

Configuration.props

@@ -26,8 +26,6 @@
     <AndroidFirstFrameworkVersion Condition="'$(AndroidFirstFrameworkVersion)' == ''">v4.4</AndroidFirstFrameworkVersion>
     <AndroidFirstApiLevel Condition="'$(AndroidFirstApiLevel)' == ''">19</AndroidFirstApiLevel>
     <AndroidJavaRuntimeApiLevel Condition="'$(AndroidJavaRuntimeApiLevel)' == ''">21</AndroidJavaRuntimeApiLevel>
-    <!-- The default API level used for $(TargetPlatformVersion) -->
-    <AndroidDefaultTargetDotnetApiLevel Condition="'$(AndroidDefaultTargetDotnetApiLevel)' == ''">31</AndroidDefaultTargetDotnetApiLevel>
     <!-- The min API level supported by Microsoft.Android.Sdk, should refactor/remove when this value is the same as $(AndroidFirstApiLevel) -->
     <AndroidMinimumDotNetApiLevel Condition="'$(AndroidMinimumDotNetApiLevel)' == ''">21</AndroidMinimumDotNetApiLevel>
     <AndroidFirstPlatformId Condition="'$(AndroidFirstPlatformId)' == ''">$(AndroidFirstApiLevel)</AndroidFirstPlatformId>
@@ -39,6 +37,8 @@
     <AndroidLatestUnstableApiLevel Condition="'$(AndroidLatestUnstableApiLevel)' == ''">32</AndroidLatestUnstableApiLevel>
     <AndroidLatestUnstablePlatformId Condition="'$(AndroidLatestUnstablePlatformId)' == ''">32</AndroidLatestUnstablePlatformId>
     <AndroidLatestUnstableFrameworkVersion Condition="'$(AndroidLatestUnstableFrameworkVersion)'==''">v12.1</AndroidLatestUnstableFrameworkVersion>
+    <!-- The default API level used for $(TargetPlatformVersion) in .NET 6, can be increased again in .NET 7 -->
+    <AndroidDefaultTargetDotnetApiLevel Condition=" '$(AndroidDefaultTargetDotnetApiLevel)' == '' ">32</AndroidDefaultTargetDotnetApiLevel>
     <!-- The API level and TargetFrameworkVersion for the default Mono.Android.dll build -->
     <AndroidApiLevel Condition=" '$(AndroidApiLevel)' == '' ">$(AndroidLatestStableApiLevel)</AndroidApiLevel>
     <AndroidPlatformId Condition=" '$(AndroidPlatformId)' == '' ">$(AndroidLatestStablePlatformId)</AndroidPlatformId>

src/Xamarin.Android.Build.Tasks/Microsoft.NET.Sdk.Android/WorkloadManifest.in.json

@@ -5,7 +5,6 @@
       "description": ".NET SDK Workload for building Android applications.",
       "packs": [
         "Microsoft.Android.Sdk",
-        "Microsoft.Android.Ref.31",
         "Microsoft.Android.Ref.32",
         "Microsoft.Android.Runtime.32.android-arm",
         "Microsoft.Android.Runtime.32.android-arm64",
@@ -29,10 +28,6 @@
         "linux-x64": "Microsoft.Android.Sdk.Linux"
       }
     },
-    "Microsoft.Android.Ref.31": {
-      "kind": "framework",
-      "version": "31.0.101-preview.11.117"
-    },
     "Microsoft.Android.Ref.32": {
       "kind": "framework",
       "version": "@WORKLOAD_VERSION@"

src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/XASdkTests.cs

@@ -217,7 +217,7 @@ public void DotNetNew ([Values ("android", "androidlib", "android-bindinglib")]
 		}
 
 		[Test]
-		public void DotNetPack ([Values ("net6.0-android", "net6.0-android31")] string targetFramework)
+		public void DotNetPack ([Values ("net6.0-android", "net6.0-android32")] string targetFramework)
 		{
 			var proj = new XASdkProject (outputType: "Library") {
 				TargetFramework = targetFramework,
@@ -249,8 +249,8 @@ public void DotNetPack ([Values ("net6.0-android", "net6.0-android31")] string t
 			var nupkgPath = Path.Combine (FullProjectDirectory, proj.OutputPath, "..", $"{proj.ProjectName}.1.0.0.nupkg");
 			FileAssert.Exists (nupkgPath);
 			using (var nupkg = ZipHelper.OpenZip (nupkgPath)) {
-				nupkg.AssertContainsEntry (nupkgPath, $"lib/net6.0-android31.0/{proj.ProjectName}.dll");
-				nupkg.AssertContainsEntry (nupkgPath, $"lib/net6.0-android31.0/{proj.ProjectName}.aar");
+				nupkg.AssertContainsEntry (nupkgPath, $"lib/net6.0-android32.0/{proj.ProjectName}.dll");
+				nupkg.AssertContainsEntry (nupkgPath, $"lib/net6.0-android32.0/{proj.ProjectName}.aar");
 			}
 		}
 

src/Xamarin.Android.Build.Tasks/Xamarin.Android.Build.Tasks.targets

@@ -219,7 +219,7 @@
     </ReplaceFileContents>
   </Target>
   <Target Name="_GenerateSupportedPlatforms"
-      Inputs="$(BootstrapTasksAssembly);$(MSBuildThisFile);..\..\bin\Build$(Configuration)\Mono.Android.Apis.projitems"
+      Inputs="$(BootstrapTasksAssembly);$(MSBuildThisFile);..\..\Configuration.props;..\..\bin\Build$(Configuration)\Mono.Android.Apis.projitems"
       Outputs="Microsoft.Android.Sdk\targets\Microsoft.Android.Sdk.SupportedPlatforms.targets">
     <GenerateSupportedPlatforms
         AndroidApiInfo="@(AndroidApiInfo)"