diff --git a/services/core/java/com/android/server/wm/DisplayContent.java b/services/core/java/com/android/server/wm/DisplayContent.java
index 4660757024095..b3fafa2137660 100644
--- a/services/core/java/com/android/server/wm/DisplayContent.java
+++ b/services/core/java/com/android/server/wm/DisplayContent.java
@@ -1575,8 +1575,10 @@ class DisplayContent extends RootDisplayArea implements WindowManagerPolicy.Disp
                 mAtmService.getTaskChangeNotificationController()
                         .notifyTaskRequestedOrientationChanged(task.mTaskId, orientation);
             }
-            // Currently there is no use case from non-activity.
-            if (handleTopActivityLaunchingInDifferentOrientation(r, true /* checkOpening */)) {
+            // The orientation source may not be the top if it uses SCREEN_ORIENTATION_BEHIND.
+            final ActivityRecord topCandidate = !r.mVisibleRequested ? topRunningActivity() : r;
+            if (handleTopActivityLaunchingInDifferentOrientation(
+                    topCandidate, r, true /* checkOpening */)) {
                 // Display orientation should be deferred until the top fixed rotation is finished.
                 return false;
             }
@@ -1593,7 +1595,7 @@ class DisplayContent extends RootDisplayArea implements WindowManagerPolicy.Disp
 
     /**
      * Returns a valid rotation if the activity can use different orientation than the display.
-     * Otherwise {@link #ROTATION_UNDEFINED}.
+     * Otherwise {@link android.app.WindowConfiguration#ROTATION_UNDEFINED}.
      */
     @Rotation
     int rotationForActivityInDifferentOrientation(@NonNull ActivityRecord r) {
@@ -1603,6 +1605,15 @@ class DisplayContent extends RootDisplayArea implements WindowManagerPolicy.Disp
         if (!WindowManagerService.ENABLE_FIXED_ROTATION_TRANSFORM) {
             return ROTATION_UNDEFINED;
         }
+        if (r.mOrientation == ActivityInfo.SCREEN_ORIENTATION_BEHIND) {
+            final ActivityRecord nextCandidate = getActivity(
+                    a -> a.mOrientation != SCREEN_ORIENTATION_UNSET
+                            && a.mOrientation != ActivityInfo.SCREEN_ORIENTATION_BEHIND,
+                    r, false /* includeBoundary */, true /* traverseTopToBottom */);
+            if (nextCandidate != null) {
+                r = nextCandidate;
+            }
+        }
         if (r.inMultiWindowMode() || r.getRequestedConfigurationOrientation(true /* forDisplay */)
                 == getConfiguration().orientation) {
             return ROTATION_UNDEFINED;
@@ -1616,18 +1627,25 @@ class DisplayContent extends RootDisplayArea implements WindowManagerPolicy.Disp
         return rotation;
     }
 
+    boolean handleTopActivityLaunchingInDifferentOrientation(@NonNull ActivityRecord r,
+            boolean checkOpening) {
+        return handleTopActivityLaunchingInDifferentOrientation(r, r, checkOpening);
+    }
+
     /**
      * We need to keep display rotation fixed for a while when the activity in different orientation
      * is launching until the launch animation is done to avoid showing the previous activity
      * inadvertently in a wrong orientation.
      *
      * @param r The launching activity which may change display orientation.
+     * @param orientationSrc It may be different from {@param r} if the launching activity uses
+     *                       "behind" orientation.
      * @param checkOpening Whether to check if the activity is animating by transition. Set to
      *                     {@code true} if the caller is not sure whether the activity is launching.
      * @return {@code true} if the fixed rotation is started.
      */
-    boolean handleTopActivityLaunchingInDifferentOrientation(@NonNull ActivityRecord r,
-            boolean checkOpening) {
+    private boolean handleTopActivityLaunchingInDifferentOrientation(@NonNull ActivityRecord r,
+            @NonNull ActivityRecord orientationSrc, boolean checkOpening) {
         if (!WindowManagerService.ENABLE_FIXED_ROTATION_TRANSFORM) {
             return false;
         }
@@ -1676,7 +1694,7 @@ class DisplayContent extends RootDisplayArea implements WindowManagerPolicy.Disp
             // animation is not running (it may be swiping to home).
             return false;
         }
-        final int rotation = rotationForActivityInDifferentOrientation(r);
+        final int rotation = rotationForActivityInDifferentOrientation(orientationSrc);
         if (rotation == ROTATION_UNDEFINED) {
             // The display rotation won't be changed by current top activity. The client side
             // adjustments of previous rotated activity should be cleared earlier. Otherwise if
diff --git a/services/tests/wmtests/src/com/android/server/wm/DisplayContentTests.java b/services/tests/wmtests/src/com/android/server/wm/DisplayContentTests.java
index 118f159bee7bc..09f3b0c26a2fb 100644
--- a/services/tests/wmtests/src/com/android/server/wm/DisplayContentTests.java
+++ b/services/tests/wmtests/src/com/android/server/wm/DisplayContentTests.java
@@ -22,6 +22,7 @@ import static android.app.WindowConfiguration.WINDOWING_MODE_FREEFORM;
 import static android.app.WindowConfiguration.WINDOWING_MODE_FULLSCREEN;
 import static android.app.WindowConfiguration.WINDOWING_MODE_PINNED;
 import static android.content.pm.ActivityInfo.FLAG_SHOW_WHEN_LOCKED;
+import static android.content.pm.ActivityInfo.SCREEN_ORIENTATION_BEHIND;
 import static android.content.pm.ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
 import static android.content.pm.ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
 import static android.content.pm.ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;
@@ -1092,6 +1093,25 @@ public class DisplayContentTests extends WindowTestsBase {
         assertEquals(ROTATION_180, dc.getRotation());
     }
 
+    @Test
+    public void testOrientationBehind() {
+        final ActivityRecord prev = new ActivityBuilder(mAtm).setCreateTask(true)
+                .setScreenOrientation(getRotatedOrientation(mDisplayContent)).build();
+        prev.mVisibleRequested = false;
+        final ActivityRecord top = new ActivityBuilder(mAtm).setCreateTask(true)
+                .setScreenOrientation(SCREEN_ORIENTATION_BEHIND).build();
+        assertNotEquals(WindowConfiguration.ROTATION_UNDEFINED,
+                mDisplayContent.rotationForActivityInDifferentOrientation(top));
+
+        mDisplayContent.requestTransitionAndLegacyPrepare(WindowManager.TRANSIT_OPEN, 0);
+        top.setVisibility(true);
+        mDisplayContent.updateOrientation();
+        // The top uses "behind", so the orientation is decided by the previous.
+        assertEquals(prev, mDisplayContent.getLastOrientationSource());
+        // The top will use the rotation from "prev" with fixed rotation.
+        assertTrue(top.hasFixedRotationTransform());
+    }
+
     @Test
     public void testFixedToUserRotationChanged() {
         final DisplayContent dc = createNewDisplay();
@@ -1650,8 +1670,7 @@ public class DisplayContentTests extends WindowTestsBase {
         // The condition should reject using fixed rotation because the resumed client in real case
         // might get display info immediately. And the fixed rotation adjustments haven't arrived
         // client side so the info may be inconsistent with the requested orientation.
-        verify(mDisplayContent).handleTopActivityLaunchingInDifferentOrientation(eq(app),
-                eq(true) /* checkOpening */);
+        verify(mDisplayContent).updateOrientation(eq(app), anyBoolean());
         assertFalse(app.isFixedRotationTransforming());
         assertFalse(mDisplayContent.hasTopFixedRotationLaunchingApp());
     }