Add API 29 and 30 to KnownVersions

[jonathanpeppers]

Context: dotnet/android#4873

Although this is related to dotnet/android#4873, it is not the full fix. We probably should list the missing versions here anyway, though.

[jonpryor]

For "sanity" purposes, I would prefer for starters that we not update KnownVersions, and instead try the patch suggested on dotnet/android#4873 (comment):

diff --git a/src/Xamarin.Android.Tools.AndroidSdk/AndroidSdkInfo.cs b/src/Xamarin.Android.Tools.AndroidSdk/AndroidSdkInfo.cs
index 1297e51..d2d3b5f 100644
--- a/src/Xamarin.Android.Tools.AndroidSdk/AndroidSdkInfo.cs
+++ b/src/Xamarin.Android.Tools.AndroidSdk/AndroidSdkInfo.cs
@@ -98,11 +98,15 @@ namespace Xamarin.Android.Tools
 
 		public string? TryGetPlatformDirectoryFromApiLevel (string idOrApiLevel, AndroidVersions versions)
 		{
+			string? dir = GetPlatformDirectoryFromId (idOrApiLevel);
+			if (Directory.Exists (dir))
+				return dir;
+
 			var id  = versions.GetIdFromApiLevel (idOrApiLevel);
 			if (id == null)
 				return null;
 
-			string? dir = GetPlatformDirectoryFromId (id);
+			dir = GetPlatformDirectoryFromId (id);
 
 			if (Directory.Exists (dir))
 				return dir;

and try to see how far we can get things to work w/o having KnownVersions data.

[jonathanpeppers]

@jonpryor I think the problem happens even sooner:

https://github.com/xamarin/xamarin-android-tools/blob/3974fc38c0f25f943b5d3bf0a4e174532a2a60ee/src/Xamarin.Android.Tools.AndroidSdk/AndroidVersions.cs#L105-L119

If 29 came in here, these would both return null. And so null is passed into TryGetPlatformDirectoryFromApiLevel as well.

[jonathanpeppers]

@jonpryor I can confirm that the actual problem here is fixed in: dotnet/maui-samples#25

This is using: dotnet/android@5d1ac0a

Should we merge this, or should I close it?

[jonpryor]

"Android X" was the codeName for API-29?!

I don't remember that codename…

[jonathanpeppers]

I guess it is Android10?

https://source.android.com/setup/start/build-numbers