diff --git a/services/core/java/com/android/server/wm/ActivityStack.java b/services/core/java/com/android/server/wm/ActivityStack.java
index cb2d98cc2afb5..70488b4b29d91 100644
--- a/services/core/java/com/android/server/wm/ActivityStack.java
+++ b/services/core/java/com/android/server/wm/ActivityStack.java
@@ -382,6 +382,7 @@ class ActivityStack extends Task {
             return mBehindFullscreenActivity;
         }
 
+        /** Returns {@code true} to stop the outer loop and indicate the result is computed. */
         private boolean processActivity(ActivityRecord r, ActivityRecord topActivity) {
             if (mAboveTop) {
                 if (r == topActivity) {
@@ -397,7 +398,10 @@ class ActivityStack extends Task {
             }
 
             if (mHandlingOccluded) {
-                mHandleBehindFullscreenActivity.accept(r);
+                // Iterating through all occluded activities.
+                if (mBehindFullscreenActivity) {
+                    mHandleBehindFullscreenActivity.accept(r);
+                }
             } else if (r == mToCheck) {
                 return true;
             } else if (mBehindFullscreenActivity) {
diff --git a/services/tests/wmtests/src/com/android/server/wm/ActivityStackTests.java b/services/tests/wmtests/src/com/android/server/wm/ActivityStackTests.java
index 822cb5a0c2d42..64e08c6ef1085 100644
--- a/services/tests/wmtests/src/com/android/server/wm/ActivityStackTests.java
+++ b/services/tests/wmtests/src/com/android/server/wm/ActivityStackTests.java
@@ -76,6 +76,9 @@ import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
+import java.util.ArrayList;
+import java.util.function.Consumer;
+
 /**
  * Tests for the {@link ActivityStack} class.
  *
@@ -1327,6 +1330,8 @@ public class ActivityStackTests extends ActivityTestsBase {
 
     @Test
     public void testCheckBehindFullscreenActivity() {
+        final ArrayList<ActivityRecord> occludedActivities = new ArrayList<>();
+        final Consumer<ActivityRecord> handleBehindFullscreenActivity = occludedActivities::add;
         final ActivityRecord bottomActivity =
                 new ActivityBuilder(mService).setStack(mStack).setTask(mTask).build();
         final ActivityRecord topActivity =
@@ -1337,12 +1342,21 @@ public class ActivityStackTests extends ActivityTestsBase {
         assertFalse(mStack.checkBehindFullscreenActivity(topActivity,
                 null /* handleBehindFullscreenActivity */));
 
+        // Top activity occludes bottom activity.
+        mStack.checkBehindFullscreenActivity(null /* toCheck */, handleBehindFullscreenActivity);
+        assertThat(occludedActivities).containsExactly(bottomActivity);
+
         doReturn(false).when(topActivity).occludesParent();
         assertFalse(mStack.checkBehindFullscreenActivity(bottomActivity,
                 null /* handleBehindFullscreenActivity */));
         assertFalse(mStack.checkBehindFullscreenActivity(topActivity,
                 null /* handleBehindFullscreenActivity */));
 
+        occludedActivities.clear();
+        // Top activity doesn't occlude parent, so the bottom activity is not occluded.
+        mStack.checkBehindFullscreenActivity(null /* toCheck */, handleBehindFullscreenActivity);
+        assertThat(occludedActivities).isEmpty();
+
         final ActivityRecord finishingActivity =
                 new ActivityBuilder(mService).setStack(mStack).setTask(mTask).build();
         finishingActivity.finishing = true;