Unable to specify PROPERTY_SPECIAL_USE_FGS_SUBTYPE via Service Attribute

[tipa]

Android application type

.NET Android (net7.0-android, net8.0-android, etc.)

Affected platform version

VS2022, NET8

Description

The goal is to specify a FOREGROUND_SERVICE_SPECIAL_USE permission using a Service attribute.
This issue is a continuation of this issue: #8409, which was closed after fixing a problem that prevented the foregroundServiceType to be filled in the AndroidManifest.xml.
The issue that remains is that is isn't possible to declare the PROPERTY_SPECIAL_USE_FGS_SUBTYPE for "special use" via an attribute: https://developer.android.com/about/versions/14/changes/fgs-types-required#special-use

Did you find any workaround?

I was able to workaround the problem by manually adding the service tag in the AndroidManifex.xml and giving my Service an explicit name

<service android:foregroundServiceType="specialUse" android:name="my.app.MyService">
   <property android:name="android.app.PROPERTY_SPECIAL_USE_FGS_SUBTYPE"
             android:value="Explanation on why I am using this service type"/>
</service>

[Service(Name = "my.app.MyService")]
sealed class FocusSessionService : Service
{ 
}

[jonpryor]

Related: https://developer.android.com/guide/topics/manifest/property-element

We should probably introduce a PropertyAttribute, which emits <property/> within the appropriate scope:

[AttributeUsage (AttributeTargets.Class, AllowMultiple=true)]
public partial class PropertyAttribute : Attribute {
    public PropertyAttribute (string name);
    public string Resource {get; set;}
    public string Value {get; set;}
}

which would allow:

[Service]
[Property ("android.app.PROPERTY_SPECIAL_USE_FGS_SUBTYPE", Value="Explanation")]
partial class FocusSessionService : Service {
}

Open design question: from the <property/> docs:

Note: A <property> tag should not contain both android:value and android:resource attributes. If that happens, android:resource is preferred.

Given this, it might instead be better to have PropertyResourceAttribute and PropertyValueAttribute instead of a single PropertyAttribute.