fix(android): replace non-compiling JNI constructor with [DynamicDependency]

osu.Android/Linker.xml

@@ -104,13 +104,16 @@
        "to silence the warnings" allows ILLink to freely trim JNI-only constructors
        from AndroidGameActivity, crashing the app on launch.
 
-       ADDITIONAL DEFENCE (v2026.508.227+): OsuGameActivity now also declares its own
-       explicit (IntPtr, JniHandleOwnership) constructor that chains to base.  Because
-       osu.Android is unambiguously preserve="all" and is always resolvable at
-       descriptor-processing time, this makes the JNI-activation constructor available
-       in the concrete type regardless of whether the IL2007-deferred rule for
-       osu.Framework.Android is honoured.  The v2026.508.226 field crash confirmed
-       that the deferred rule alone is not always sufficient. -->
+       ADDITIONAL DEFENCE (v2026.508.228+): OsuGameActivity carries a [DynamicDependency]
+       attribute that explicitly roots AndroidGameActivity's constructors from the
+       osu.Android assembly.  Because osu.Android is unambiguously preserve="all" and is
+       always resolvable at descriptor-processing time, ILLink processes this root
+       reference before it can trim the JNI-activation constructor, regardless of whether
+       the IL2007-deferred rule for osu.Framework.Android is honoured.  This supersedes
+       the v2026.508.227 approach (explicit OsuGameActivity(IntPtr, JniHandleOwnership)
+       constructor) which did not compile because AndroidGameActivity does not expose an
+       explicit (IntPtr, JniHandleOwnership) constructor — only its SDLActivity grandparent
+       does, and C# base() invocations resolve only against the direct parent class. -->
   <assembly fullname="osu.Framework"         preserve="all" />
   <assembly fullname="osu.Framework.Android" preserve="all" />
   <assembly fullname="ppy.Veldrid.SPIRV"     preserve="all" />

osu.Android/OsuGameActivity.cs

@@ -15,6 +15,7 @@
 using System.Threading;
 using System.Threading.Tasks;
 using System;
+using System.Diagnostics.CodeAnalysis;
 using Uri = Android.Net.Uri;
 using ManagedBass; // Required for Bass.AndroidAAudio + Bass.DevicePeriod startup init (FLAG_BASS_AAUDIO_ENABLED path in OnCreate)
 using osu.Android.Input;
@@ -88,19 +89,13 @@ protected override osu.Framework.Game CreateGame()
             return game;
         }
 
-        // JNI activation constructor. Android's TypeManager.Activate resolves this
-        // constructor via reflection when recreating the managed wrapper from a JNI
-        // handle (e.g. after process restore or across configuration changes). Without
-        // an explicit declaration here the linker might only find the inherited version
-        // in osu.Framework.Android — an assembly that ILLink cannot resolve during
-        // descriptor processing (IL2007), making the preserve="all" rule unreliable for
-        // inherited members. Declaring it in osu.Android (which is unambiguously
-        // preserve="all") guarantees the constructor survives trimming.
-        protected OsuGameActivity(IntPtr handle, JniHandleOwnership transfer)
-            : base(handle, transfer)
-        {
-        }
-
+        // Preserve AndroidGameActivity's (IntPtr, JniHandleOwnership) JNI-activation constructor.
+        // The [assembly: preserve="all"] descriptor for osu.Framework.Android in Linker.xml is deferred
+        // (IL2007) because the framework assembly is not yet in ILLink's search path at descriptor time.
+        // Placing [DynamicDependency] on this constructor (which lives in osu.Android — always resolvable)
+        // roots the AndroidGameActivity constructor in ILLink's walk before it can be trimmed away.
+        [DynamicDependency(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors,
+            "osu.Framework.Android.AndroidGameActivity", "osu.Framework.Android")]
         public OsuGameActivity()
         {
             game = new OsuGameAndroid(this);