Support relative mouse for Samsung DeX on Samsung Experience 9.5 or later (Android 8.1 or later)

android-project/app/src/main/java/org/libsdl/app/SDLActivity.java

@@ -766,9 +766,14 @@ public class SDLActivity extends Activity implements View.OnSystemUiVisibilityCh
             return false;
         }
 
-        // Samsung DeX mode doesn't support relative mice properly under Android 7 APIs,
-        // and simply returns no data under Android 8 APIs.
-        if (isDeXMode()) {
+        // DeX mode in Samsung Experience 9.0 and earlier doesn't support relative mice properly under 
+        // Android 7 APIs, and simply returns no data under Android 8 APIs.
+        //
+        // This is fixed in Samsung Experience 9.5, which corresponds to Android 8.1.0, and
+        // thus SDK version 27.  If we are in DeX mode and not API 27 or higher, as a result,
+        // we should stick to relative mode.
+        //
+        if ((Build.VERSION.SDK_INT < 27) && isDeXMode()) {
             return false;
         }
 

android-project/app/src/main/java/org/libsdl/app/SDLControllerManager.java

@@ -764,7 +764,7 @@ class SDLGenericMotionListener_API26 extends SDLGenericMotionListener_API24 {
 
     @Override
     public boolean supportsRelativeMouse() {
-        return !SDLActivity.isDeXMode();
+        return (!SDLActivity.isDeXMode() || (Build.VERSION.SDK_INT >= 27));
     }
 
     @Override
@@ -774,7 +774,7 @@ class SDLGenericMotionListener_API26 extends SDLGenericMotionListener_API24 {
 
     @Override
     public boolean setRelativeMouseEnabled(boolean enabled) {
-        if (!SDLActivity.isDeXMode()) {
+        if (!SDLActivity.isDeXMode() || (Build.VERSION.SDK_INT >= 27)) {
             if (enabled) {
                 SDLActivity.getContentView().requestPointerCapture();
             }