android: fix trimming-related crashes and resolve linker warnings

- Update `Linker.xml` to preserve `ActiveMixers` as both field and property.
- Preserve critical types (OsuGameActivity, OsuGameAndroid, OsuConfigManager, etc.) to prevent immediate startup crashes.
- Robustify reflection logic in `OsuGameAndroid.cs` to handle both field and property retrieval of `ActiveMixers`.
- Expand `UnconditionalSuppressMessage` attributes to include IL2067 and IL2106 codes.
- Explicitly preserve `ManagedBass` and `BindableList` members in `Linker.xml`.

Author: google-labs-jules[bot]

osu.Android/Linker.xml

@@ -7,14 +7,39 @@
     <type fullname="MessagePack.Resolvers.DynamicUnionResolver" preserve="all" />
     <type fullname="MessagePack.Resolvers.DynamicObjectResolver" preserve="all" />
   </assembly>
+  <assembly fullname="ManagedBass">
+    <type fullname="ManagedBass.Bass" preserve="all" />
+  </assembly>
+  <assembly fullname="ManagedBass.Mix">
+    <type fullname="ManagedBass.Mix.BassMix" preserve="all" />
+  </assembly>
   <assembly fullname="osu.Framework">
     <type fullname="osu.Framework.Audio.AudioManager">
         <field name="ActiveMixers" />
+        <property name="ActiveMixers" />
+        <field name="TrackMixer" />
+        <field name="SampleMixer" />
     </type>
     <type fullname="osu.Framework.Bindables.IBindableList`1">
         <method name="BindCollectionChanged" />
         <method name="UnbindCollectionChanged" />
     </type>
+    <type fullname="osu.Framework.Bindables.BindableList`1">
+        <method name="BindCollectionChanged" />
+        <method name="UnbindCollectionChanged" />
+    </type>
     <type fullname="osu.Framework.Audio.Mixing.AudioMixer" preserve="all" />
+    <type fullname="osu.Framework.Platform.Android.AndroidGameActivity" preserve="all" />
+  </assembly>
+  <assembly fullname="osu.Game">
+    <type fullname="osu.Game.OsuGameBase" preserve="all" />
+    <type fullname="osu.Game.Beatmaps.Beatmap" preserve="all" />
+    <type fullname="osu.Game.Rulesets.Ruleset" preserve="all" />
+    <type fullname="osu.Game.Skinning.Skin" preserve="all" />
+    <type fullname="osu.Game.Configuration.OsuConfigManager" preserve="all" />
+  </assembly>
+  <assembly fullname="osu.Android">
+    <type fullname="osu.Android.OsuGameActivity" preserve="all" />
+    <type fullname="osu.Android.OsuGameAndroid" preserve="all" />
   </assembly>
 </linker>

osu.Android/OboeAudioRedirector.cs

@@ -102,7 +102,7 @@ public void RefreshMixers(int hardwareSampleRate)
             Console.WriteLine($"[osu!] Oboe redirector initialized successfully: master={masterMixer}, sources={string.Join(',', mixerHandles)}");
         }
 
-        [UnconditionalSuppressMessage("Trimming", "IL2070, IL2072, IL2075", Justification = "Preserved in Linker.xml")]
+        [UnconditionalSuppressMessage("Trimming", "IL2067, IL2070, IL2072, IL2075, IL2106", Justification = "Preserved in Linker.xml")]
         private IEnumerable<AudioMixer> getActiveMixers()
         {
             Type type = typeof(AudioManager);
@@ -279,7 +279,7 @@ private void addMixer(AudioMixer? mixer)
                 mixerHandles.Add(handle);
         }
 
-        [UnconditionalSuppressMessage("Trimming", "IL2067, IL2070, IL2072, IL2075", Justification = "Preserved in Linker.xml")]
+        [UnconditionalSuppressMessage("Trimming", "IL2067, IL2070, IL2072, IL2075, IL2106", Justification = "Preserved in Linker.xml")]
         private int findHandle(object obj)
         {
             Type? type = obj.GetType();

osu.Android/OsuGameAndroid.cs

@@ -62,7 +62,7 @@ public OsuGameAndroid(OsuGameActivity activity)
             gameActivity = activity;
         }
 
-        [UnconditionalSuppressMessage("Trimming", "IL2070, IL2072, IL2075", Justification = "Preserved in Linker.xml")]
+        [UnconditionalSuppressMessage("Trimming", "IL2067, IL2070, IL2072, IL2075, IL2106", Justification = "Preserved in Linker.xml")]
         protected override void LoadComplete()
         {
             base.LoadComplete();
@@ -85,11 +85,12 @@ protected override void LoadComplete()
             try
             {
                 Type audioManagerType = typeof(osu.Framework.Audio.AudioManager);
-                var activeMixersField = audioManagerType.GetField("ActiveMixers", BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
+                MemberInfo? activeMixersMember = (MemberInfo?)audioManagerType.GetField("ActiveMixers", BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic) ??
+                                                 audioManagerType.GetProperty("ActiveMixers", BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
 
-                if (activeMixersField != null)
+                if (activeMixersMember != null)
                 {
-                    activeMixersList = activeMixersField.GetValue(Audio) as IEnumerable;
+                    activeMixersList = (activeMixersMember is FieldInfo field ? field.GetValue(Audio) : ((PropertyInfo)activeMixersMember).GetValue(Audio)) as IEnumerable;
 
                     if (activeMixersList != null)
                     {
@@ -390,7 +391,7 @@ public override void SetHost(GameHost host)
 
         protected override BatteryInfo CreateBatteryInfo() => new AndroidBatteryInfo();
 
-        [UnconditionalSuppressMessage("Trimming", "IL2070, IL2072, IL2075", Justification = "Preserved in Linker.xml")]
+        [UnconditionalSuppressMessage("Trimming", "IL2067, IL2070, IL2072, IL2075, IL2106", Justification = "Preserved in Linker.xml")]
         protected override void Dispose(bool isDisposing)
         {
             try

review_changes.py

@@ -0,0 +1,9 @@
+import os
+
+files = ['osu.Android/Linker.xml', 'osu.Android/OsuGameAndroid.cs', 'osu.Android/OboeAudioRedirector.cs']
+
+for f in files:
+    print(f"--- {f} ---")
+    with open(f, 'r') as content:
+        print(content.read())
+    print("\n")