Android: Input & DeX Optimizations

osu.Android/Input/AndroidKeyboardHandler.cs

@@ -32,9 +32,15 @@ public bool HandleKeyEvent(KeyEvent e)
                 e.KeyCode == Keycode.AppSwitch)
                 return false;
 
-            // In DeX, source might include other flags, use HasFlag
-            if (!e.Source.HasFlag(InputSourceType.Keyboard))
-                return false;
+            // In DeX, source might include other flags (like Mouse or Stylus).
+            // We should allow anything that is clearly a keyboard or has a valid keycode.
+            if (!e.Source.HasFlag(InputSourceType.Keyboard) && e.Source != InputSourceType.Unknown)
+            {
+                 // If it's not a keyboard source, only allow if it's from a device that HAS a keyboard
+                 var device = e.Device;
+                 if (device == null || device.KeyboardType == global::Android.Views.InputKeyboardType.None)
+                     return false;
+            }
 
             var key = mapKey(e.KeyCode);
             if (key == Key.Unknown) return false;

osu.Android/Input/AndroidStylusHandler.cs

@@ -80,6 +80,8 @@ private void handlePointer(MotionEvent e, int historyIndex)
             float x = historyIndex < 0 ? e.GetX(pointer_index) : e.GetHistoricalX(pointer_index, historyIndex);
             float y = historyIndex < 0 ? e.GetY(pointer_index) : e.GetHistoricalY(pointer_index, historyIndex);
             float pressure = historyIndex < 0 ? e.GetPressure(pointer_index) : e.GetHistoricalPressure(pointer_index, historyIndex);
+            float tiltX = e.GetAxisValue(Axis.Tilt, pointer_index);
+            float tiltY = e.GetAxisValue(Axis.Orientation, pointer_index);
 
             // DeX windowed mode offset correction
             if (View != null)

osu.Android/OsuGameActivity.cs

@@ -130,7 +130,20 @@ protected override void OnCreate(Bundle? savedInstanceState)
 
         public override bool DispatchKeyEvent(KeyEvent? e)
         {
-            if (e != null && KeyboardHandler != null && KeyboardHandler.HandleKeyEvent(e))
+            if (e == null) return false;
+
+            // Intercept mouse back button which often triggers Keycode.Back
+            if (e.KeyCode == Keycode.Back && (e.Source.HasFlag(InputSourceType.Mouse) || e.Source.HasFlag(InputSourceType.Stylus)))
+            {
+                if (e.Action == KeyEventActions.Down)
+                    KeyboardHandler?.HandleKeyEvent(new KeyEvent(KeyEventActions.Down, Keycode.Escape));
+                else if (e.Action == KeyEventActions.Up)
+                    KeyboardHandler?.HandleKeyEvent(new KeyEvent(KeyEventActions.Up, Keycode.Escape));
+
+                return true;
+            }
+
+            if (KeyboardHandler != null && KeyboardHandler.HandleKeyEvent(e))
                 return true;
 
             return base.DispatchKeyEvent(e);
@@ -157,6 +170,11 @@ public override bool DispatchTouchEvent(MotionEvent? e)
                 handled = MouseHandler?.HandleMotionEvent(e) ?? false;
             }
 
+            // Stylus events should NEVER be passed to base.DispatchTouchEvent, as it triggers
+            // Android's touch-mode which hides the cursor and shows touch effects.
+            if (isStylusEvent(e))
+                return handled;
+
             // In DeX mode, we MUST call base even if "handled" to ensure window focus and system gestures work.
             // However, if we fully consumed it (e.g. gameplay), we return true to prevent UI double-clicks.
             return base.DispatchTouchEvent(e) || handled;
@@ -183,6 +201,11 @@ public override bool DispatchGenericMotionEvent(MotionEvent? e)
                 handled = MouseHandler?.HandleMotionEvent(e) ?? false;
             }
 
+            // Stylus hover events should not be passed to base to avoid system-level hover effects
+            // and touch-mode triggers.
+            if (isStylusEvent(e))
+                return handled;
+
             return base.DispatchGenericMotionEvent(e) || handled;
         }
 

osu.Android/OsuGameAndroid.cs

@@ -368,9 +368,39 @@ public void SelectHighestRefreshRate()
                 if (window == null || windowManager == null)
                     return;
 
-                var display = OperatingSystem.IsAndroidVersionAtLeast(30)
-                    ? gameActivity.Display
-                    : windowManager.DefaultDisplay;
+                global::Android.Views.Display? display = null;
+
+                if (OperatingSystem.IsAndroidVersionAtLeast(30))
+                {
+                    // Prefer the display associated with the activity (which would be the external monitor in DeX)
+                    display = gameActivity.Display;
+                }
+
+                if (display == null)
+                {
+                    // Fallback to DisplayManager to find an external display
+                    if (gameActivity.GetSystemService(global::Android.Content.Context.DisplayService) is global::Android.Hardware.Display.DisplayManager dm)
+                    {
+                        var displays = dm.GetDisplays();
+
+                        if (gameActivity.IsDeX)
+                        {
+                             // Find the largest external display (most likely the monitor)
+                             var displayList = displays?.ToList();
+                             if (displayList != null)
+                             {
+                                 display = displayList.Where(d => d.DisplayId != 0)
+                                                   .OrderByDescending(d => d.GetSupportedModes()?.FirstOrDefault()?.RefreshRate ?? 0)
+                                                   .ThenByDescending(d => d.GetSupportedModes()?.FirstOrDefault()?.PhysicalWidth ?? 0)
+                                                   .FirstOrDefault() ?? displayList.FirstOrDefault(d => d.DisplayId == 0);
+                             }
+                        }
+                        else
+                        {
+                             display = displays?.FirstOrDefault(d => d.DisplayId == 0);
+                        }
+                    }
+                }
 
                 if (display == null)
                     return;

osu.Game/Overlays/Settings/Sections/Graphics/LayoutSettings.cs

@@ -266,6 +266,7 @@ protected override void LoadComplete()
                 var fullscreenResolutions = display.NewValue.DisplayModes
                                                    .Where(m => m.Size.Width >= 800 && m.Size.Height >= 600)
                                                    .OrderByDescending(m => Math.Max(m.Size.Height, m.Size.Width))
+                                                   .ThenByDescending(m => m.RefreshRate)
                                                    .Select(m => m.Size)
                                                    .Distinct()
                                                    .ToList();
@@ -361,10 +362,10 @@ private void onDisplaysChanged(IEnumerable<Display> displays)
 
         private void updateDisplaySettingsVisibility()
         {
-            resolutionFullscreenCanBeShown.Value = windowModeDropdown.Current.Value == WindowMode.Fullscreen && resolutionsFullscreen.Count > 1;
+            resolutionFullscreenCanBeShown.Value = (windowModeDropdown.Current.Value == WindowMode.Fullscreen && resolutionsFullscreen.Count > 1) || RuntimeInfo.OS == RuntimeInfo.Platform.Android;
             resolutionWindowedCanBeShown.Value = windowModeDropdown.Current.Value == WindowMode.Windowed && resolutionsWindowed.Count > 1;
 
-            displayDropdownCanBeShown.Value = displayDropdown.Items.Count() > 1;
+            displayDropdownCanBeShown.Value = displayDropdown.Items.Count() > 1 || RuntimeInfo.OS == RuntimeInfo.Platform.Android;
             minimiseOnFocusLossCanBeShown.Value = RuntimeInfo.IsDesktop && windowModeDropdown.Current.Value == WindowMode.Fullscreen;
             safeAreaConsiderationsCanBeShown.Value = host.Window?.SafeAreaPadding.Value.Total != Vector2.Zero;
         }

osu.Game/Tests/Visual/OnlinePlay/OnlinePlayTestScene.cs

@@ -35,7 +35,7 @@ public abstract partial class OnlinePlayTestScene : ScreenTestScene, IOnlinePlay
         private readonly Container content;
         private readonly Container drawableDependenciesContainer;
         private DelegatedDependencyContainer dependencies = null!;
-        private int currentRoomId;
+        private int currentRoomId = 1;
 
         protected OnlinePlayTestScene()
         {