diff --git a/core/java/android/view/AccessibilityInteractionController.java b/core/java/android/view/AccessibilityInteractionController.java
index 477c994..a10dda3 100644
--- a/core/java/android/view/AccessibilityInteractionController.java
+++ b/core/java/android/view/AccessibilityInteractionController.java
@@ -18,6 +18,7 @@
 
 import android.graphics.Point;
 import android.graphics.Rect;
+import android.graphics.Region;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
@@ -96,7 +97,7 @@
     }
 
     public void findAccessibilityNodeInfoByAccessibilityIdClientThread(
-            long accessibilityNodeId, int interactionId,
+            long accessibilityNodeId, Region interactiveRegion, int interactionId,
             IAccessibilityInteractionConnectionCallback callback, int flags, int interrogatingPid,
             long interrogatingTid, MagnificationSpec spec) {
         Message message = mHandler.obtainMessage();
@@ -109,6 +110,7 @@
         args.argi3 = interactionId;
         args.arg1 = callback;
         args.arg2 = spec;
+        args.arg3 = interactiveRegion;
         message.obj = args;
 
         // If the interrogation is performed by the same thread as the main UI
@@ -133,6 +135,7 @@
         final IAccessibilityInteractionConnectionCallback callback =
             (IAccessibilityInteractionConnectionCallback) args.arg1;
         final MagnificationSpec spec = (MagnificationSpec) args.arg2;
+        final Region interactiveRegion = (Region) args.arg3;
 
         args.recycle();
 
@@ -159,6 +162,7 @@
                 if (spec != null) {
                     spec.recycle();
                 }
+                adjustIsVisibleToUserIfNeeded(infos, interactiveRegion);
                 callback.setFindAccessibilityNodeInfosResult(infos, interactionId);
                 infos.clear();
             } catch (RemoteException re) {
@@ -168,8 +172,9 @@
     }
 
     public void findAccessibilityNodeInfosByViewIdClientThread(long accessibilityNodeId,
-            String viewId, int interactionId, IAccessibilityInteractionConnectionCallback callback,
-            int flags, int interrogatingPid, long interrogatingTid, MagnificationSpec spec) {
+            String viewId, Region interactiveRegion, int interactionId,
+            IAccessibilityInteractionConnectionCallback callback, int flags, int interrogatingPid,
+            long interrogatingTid, MagnificationSpec spec) {
         Message message = mHandler.obtainMessage();
         message.what = PrivateHandler.MSG_FIND_ACCESSIBLITY_NODE_INFOS_BY_VIEW_ID;
         message.arg1 = flags;
@@ -180,6 +185,7 @@
         args.arg1 = callback;
         args.arg2 = spec;
         args.arg3 = viewId;
+        args.arg4 = interactiveRegion;
 
         message.obj = args;
 
@@ -205,6 +211,7 @@
             (IAccessibilityInteractionConnectionCallback) args.arg1;
         final MagnificationSpec spec = (MagnificationSpec) args.arg2;
         final String viewId = (String) args.arg3;
+        final Region interactiveRegion = (Region) args.arg4;
 
         args.recycle();
 
@@ -241,6 +248,7 @@
                 if (spec != null) {
                     spec.recycle();
                 }
+                adjustIsVisibleToUserIfNeeded(infos, interactiveRegion);
                 callback.setFindAccessibilityNodeInfosResult(infos, interactionId);
             } catch (RemoteException re) {
                 /* ignore - the other side will time out */
@@ -249,8 +257,9 @@
     }
 
     public void findAccessibilityNodeInfosByTextClientThread(long accessibilityNodeId,
-            String text, int interactionId, IAccessibilityInteractionConnectionCallback callback,
-            int flags, int interrogatingPid, long interrogatingTid, MagnificationSpec spec) {
+            String text, Region interactiveRegion, int interactionId,
+            IAccessibilityInteractionConnectionCallback callback, int flags, int interrogatingPid,
+            long interrogatingTid, MagnificationSpec spec) {
         Message message = mHandler.obtainMessage();
         message.what = PrivateHandler.MSG_FIND_ACCESSIBLITY_NODE_INFO_BY_TEXT;
         message.arg1 = flags;
@@ -262,6 +271,7 @@
         args.argi1 = AccessibilityNodeInfo.getAccessibilityViewId(accessibilityNodeId);
         args.argi2 = AccessibilityNodeInfo.getVirtualDescendantId(accessibilityNodeId);
         args.argi3 = interactionId;
+        args.arg4 = interactiveRegion;
         message.obj = args;
 
         // If the interrogation is performed by the same thread as the main UI
@@ -287,6 +297,7 @@
         final int accessibilityViewId = args.argi1;
         final int virtualDescendantId = args.argi2;
         final int interactionId = args.argi3;
+        final Region interactiveRegion = (Region) args.arg4;
         args.recycle();
 
         List<AccessibilityNodeInfo> infos = null;
@@ -347,6 +358,7 @@
                 if (spec != null) {
                     spec.recycle();
                 }
+                adjustIsVisibleToUserIfNeeded(infos, interactiveRegion);
                 callback.setFindAccessibilityNodeInfosResult(infos, interactionId);
             } catch (RemoteException re) {
                 /* ignore - the other side will time out */
@@ -354,7 +366,8 @@
         }
     }
 
-    public void findFocusClientThread(long accessibilityNodeId, int focusType, int interactionId,
+    public void findFocusClientThread(long accessibilityNodeId, int focusType,
+            Region interactiveRegion, int interactionId,
             IAccessibilityInteractionConnectionCallback callback, int flags, int interogatingPid,
             long interrogatingTid, MagnificationSpec spec) {
         Message message = mHandler.obtainMessage();
@@ -368,6 +381,7 @@
         args.argi3 = AccessibilityNodeInfo.getVirtualDescendantId(accessibilityNodeId);
         args.arg1 = callback;
         args.arg2 = spec;
+        args.arg3 = interactiveRegion;
 
         message.obj = args;
 
@@ -394,6 +408,7 @@
         final IAccessibilityInteractionConnectionCallback callback =
             (IAccessibilityInteractionConnectionCallback) args.arg1;
         final MagnificationSpec spec = (MagnificationSpec) args.arg2;
+        final Region interactiveRegion = (Region) args.arg3;
         args.recycle();
 
         AccessibilityNodeInfo focused = null;
@@ -457,6 +472,7 @@
                 if (spec != null) {
                     spec.recycle();
                 }
+                adjustIsVisibleToUserIfNeeded(focused, interactiveRegion);
                 callback.setFindAccessibilityNodeInfoResult(focused, interactionId);
             } catch (RemoteException re) {
                 /* ignore - the other side will time out */
@@ -464,7 +480,8 @@
         }
     }
 
-    public void focusSearchClientThread(long accessibilityNodeId, int direction, int interactionId,
+    public void focusSearchClientThread(long accessibilityNodeId, int direction,
+            Region interactiveRegion, int interactionId,
             IAccessibilityInteractionConnectionCallback callback, int flags, int interogatingPid,
             long interrogatingTid, MagnificationSpec spec) {
         Message message = mHandler.obtainMessage();
@@ -477,6 +494,7 @@
         args.argi3 = interactionId;
         args.arg1 = callback;
         args.arg2 = spec;
+        args.arg3 = interactiveRegion;
 
         message.obj = args;
 
@@ -502,6 +520,7 @@
         final IAccessibilityInteractionConnectionCallback callback =
             (IAccessibilityInteractionConnectionCallback) args.arg1;
         final MagnificationSpec spec = (MagnificationSpec) args.arg2;
+        final Region interactiveRegion = (Region) args.arg3;
 
         args.recycle();
 
@@ -530,6 +549,7 @@
                 if (spec != null) {
                     spec.recycle();
                 }
+                adjustIsVisibleToUserIfNeeded(next, interactiveRegion);
                 callback.setFindAccessibilityNodeInfoResult(next, interactionId);
             } catch (RemoteException re) {
                 /* ignore - the other side will time out */
@@ -644,6 +664,30 @@
         }
     }
 
+    private void adjustIsVisibleToUserIfNeeded(List<AccessibilityNodeInfo> infos,
+            Region interactiveRegion) {
+        if (interactiveRegion == null || infos == null) {
+            return;
+        }
+        final int infoCount = infos.size();
+        for (int i = 0; i < infoCount; i++) {
+            AccessibilityNodeInfo info = infos.get(i);
+            adjustIsVisibleToUserIfNeeded(info, interactiveRegion);
+        }
+    }
+
+    private void adjustIsVisibleToUserIfNeeded(AccessibilityNodeInfo info,
+            Region interactiveRegion) {
+        if (interactiveRegion == null || info == null) {
+            return;
+        }
+        Rect boundsInScreen = mTempRect;
+        info.getBoundsInScreen(boundsInScreen);
+        if (interactiveRegion.quickReject(boundsInScreen)) {
+            info.setVisibleToUser(false);
+        }
+    }
+
     private void applyAppScaleAndMagnificationSpecIfNeeded(AccessibilityNodeInfo info,
             MagnificationSpec spec) {
         if (info == null) {
diff --git a/core/java/android/view/ViewRootImpl.java b/core/java/android/view/ViewRootImpl.java
index 49d925f..dd1cbc9 100644
--- a/core/java/android/view/ViewRootImpl.java
+++ b/core/java/android/view/ViewRootImpl.java
@@ -6629,14 +6629,15 @@
 
         @Override
         public void findAccessibilityNodeInfoByAccessibilityId(long accessibilityNodeId,
-                int interactionId, IAccessibilityInteractionConnectionCallback callback, int flags,
+                Region interactiveRegion, int interactionId,
+                IAccessibilityInteractionConnectionCallback callback, int flags,
                 int interrogatingPid, long interrogatingTid, MagnificationSpec spec) {
             ViewRootImpl viewRootImpl = mViewRootImpl.get();
             if (viewRootImpl != null && viewRootImpl.mView != null) {
                 viewRootImpl.getAccessibilityInteractionController()
                     .findAccessibilityNodeInfoByAccessibilityIdClientThread(accessibilityNodeId,
-                            interactionId, callback, flags, interrogatingPid, interrogatingTid,
-                            spec);
+                            interactiveRegion, interactionId, callback, flags, interrogatingPid,
+                            interrogatingTid, spec);
             } else {
                 // We cannot make the call and notify the caller so it does not wait.
                 try {
@@ -6669,15 +6670,15 @@
 
         @Override
         public void findAccessibilityNodeInfosByViewId(long accessibilityNodeId,
-                String viewId, int interactionId,
+                String viewId, Region interactiveRegion, int interactionId,
                 IAccessibilityInteractionConnectionCallback callback, int flags,
                 int interrogatingPid, long interrogatingTid, MagnificationSpec spec) {
             ViewRootImpl viewRootImpl = mViewRootImpl.get();
             if (viewRootImpl != null && viewRootImpl.mView != null) {
                 viewRootImpl.getAccessibilityInteractionController()
                     .findAccessibilityNodeInfosByViewIdClientThread(accessibilityNodeId,
-                            viewId, interactionId, callback, flags, interrogatingPid,
-                            interrogatingTid, spec);
+                            viewId, interactiveRegion, interactionId, callback, flags,
+                            interrogatingPid, interrogatingTid, spec);
             } else {
                 // We cannot make the call and notify the caller so it does not wait.
                 try {
@@ -6690,14 +6691,15 @@
 
         @Override
         public void findAccessibilityNodeInfosByText(long accessibilityNodeId, String text,
-                int interactionId, IAccessibilityInteractionConnectionCallback callback, int flags,
+                Region interactiveRegion, int interactionId,
+                IAccessibilityInteractionConnectionCallback callback, int flags,
                 int interrogatingPid, long interrogatingTid, MagnificationSpec spec) {
             ViewRootImpl viewRootImpl = mViewRootImpl.get();
             if (viewRootImpl != null && viewRootImpl.mView != null) {
                 viewRootImpl.getAccessibilityInteractionController()
                     .findAccessibilityNodeInfosByTextClientThread(accessibilityNodeId, text,
-                            interactionId, callback, flags, interrogatingPid, interrogatingTid,
-                            spec);
+                            interactiveRegion, interactionId, callback, flags, interrogatingPid,
+                            interrogatingTid, spec);
             } else {
                 // We cannot make the call and notify the caller so it does not wait.
                 try {
@@ -6709,14 +6711,15 @@
         }
 
         @Override
-        public void findFocus(long accessibilityNodeId, int focusType, int interactionId,
-                IAccessibilityInteractionConnectionCallback callback, int flags,
+        public void findFocus(long accessibilityNodeId, int focusType, Region interactiveRegion,
+                int interactionId, IAccessibilityInteractionConnectionCallback callback, int flags,
                 int interrogatingPid, long interrogatingTid, MagnificationSpec spec) {
             ViewRootImpl viewRootImpl = mViewRootImpl.get();
             if (viewRootImpl != null && viewRootImpl.mView != null) {
                 viewRootImpl.getAccessibilityInteractionController()
-                    .findFocusClientThread(accessibilityNodeId, focusType, interactionId, callback,
-                            flags, interrogatingPid, interrogatingTid, spec);
+                    .findFocusClientThread(accessibilityNodeId, focusType, interactiveRegion,
+                            interactionId, callback, flags, interrogatingPid, interrogatingTid,
+                            spec);
             } else {
                 // We cannot make the call and notify the caller so it does not wait.
                 try {
@@ -6728,14 +6731,15 @@
         }
 
         @Override
-        public void focusSearch(long accessibilityNodeId, int direction, int interactionId,
-                IAccessibilityInteractionConnectionCallback callback, int flags,
+        public void focusSearch(long accessibilityNodeId, int direction, Region interactiveRegion,
+                int interactionId, IAccessibilityInteractionConnectionCallback callback, int flags,
                 int interrogatingPid, long interrogatingTid, MagnificationSpec spec) {
             ViewRootImpl viewRootImpl = mViewRootImpl.get();
             if (viewRootImpl != null && viewRootImpl.mView != null) {
                 viewRootImpl.getAccessibilityInteractionController()
-                    .focusSearchClientThread(accessibilityNodeId, direction, interactionId,
-                            callback, flags, interrogatingPid, interrogatingTid, spec);
+                    .focusSearchClientThread(accessibilityNodeId, direction, interactiveRegion,
+                            interactionId, callback, flags, interrogatingPid, interrogatingTid,
+                            spec);
             } else {
                 // We cannot make the call and notify the caller so it does not wait.
                 try {
diff --git a/core/java/android/view/accessibility/IAccessibilityInteractionConnection.aidl b/core/java/android/view/accessibility/IAccessibilityInteractionConnection.aidl
index 8d15472..faf7789 100644
--- a/core/java/android/view/accessibility/IAccessibilityInteractionConnection.aidl
+++ b/core/java/android/view/accessibility/IAccessibilityInteractionConnection.aidl
@@ -16,6 +16,7 @@
 
 package android.view.accessibility;
 
+import android.graphics.Region;
 import android.os.Bundle;
 import android.view.MagnificationSpec;
 import android.view.accessibility.AccessibilityNodeInfo;
@@ -29,23 +30,23 @@
  */
 oneway interface IAccessibilityInteractionConnection {
 
-    void findAccessibilityNodeInfoByAccessibilityId(long accessibilityNodeId, int interactionId,
-        IAccessibilityInteractionConnectionCallback callback, int flags, int interrogatingPid,
-        long interrogatingTid, in MagnificationSpec spec);
-
-    void findAccessibilityNodeInfosByViewId(long accessibilityNodeId, String viewId,
+    void findAccessibilityNodeInfoByAccessibilityId(long accessibilityNodeId, in Region bounds,
         int interactionId, IAccessibilityInteractionConnectionCallback callback, int flags,
         int interrogatingPid, long interrogatingTid, in MagnificationSpec spec);
 
-    void findAccessibilityNodeInfosByText(long accessibilityNodeId, String text, int interactionId,
+    void findAccessibilityNodeInfosByViewId(long accessibilityNodeId, String viewId,
+        in Region bounds, int interactionId, IAccessibilityInteractionConnectionCallback callback,
+        int flags, int interrogatingPid, long interrogatingTid, in MagnificationSpec spec);
+
+    void findAccessibilityNodeInfosByText(long accessibilityNodeId, String text, in Region bounds,
+        int interactionId, IAccessibilityInteractionConnectionCallback callback, int flags,
+        int interrogatingPid, long interrogatingTid, in MagnificationSpec spec);
+
+    void findFocus(long accessibilityNodeId, int focusType, in Region bounds, int interactionId,
         IAccessibilityInteractionConnectionCallback callback, int flags, int interrogatingPid,
         long interrogatingTid, in MagnificationSpec spec);
 
-    void findFocus(long accessibilityNodeId, int focusType, int interactionId,
-        IAccessibilityInteractionConnectionCallback callback, int flags, int interrogatingPid,
-        long interrogatingTid, in MagnificationSpec spec);
-
-    void focusSearch(long accessibilityNodeId, int direction, int interactionId,
+    void focusSearch(long accessibilityNodeId, int direction, in Region bounds, int interactionId,
         IAccessibilityInteractionConnectionCallback callback, int flags, int interrogatingPid,
         long interrogatingTid, in MagnificationSpec spec);
 
diff --git a/services/accessibility/java/com/android/server/accessibility/AccessibilityManagerService.java b/services/accessibility/java/com/android/server/accessibility/AccessibilityManagerService.java
index 4e2f52c..5d13fed 100644
--- a/services/accessibility/java/com/android/server/accessibility/AccessibilityManagerService.java
+++ b/services/accessibility/java/com/android/server/accessibility/AccessibilityManagerService.java
@@ -42,6 +42,7 @@
 import android.database.ContentObserver;
 import android.graphics.Point;
 import android.graphics.Rect;
+import android.graphics.Region;
 import android.hardware.display.DisplayManager;
 import android.hardware.input.InputManager;
 import android.net.Uri;
@@ -162,6 +163,8 @@
     private final List<AccessibilityServiceInfo> mEnabledServicesForFeedbackTempList =
             new ArrayList<>();
 
+    private final Region mTempRegion = new Region();
+
     private final Rect mTempRect = new Rect();
 
     private final Point mTempPoint = new Point();
@@ -2161,6 +2164,7 @@
                 throws RemoteException {
             final int resolvedWindowId;
             IAccessibilityInteractionConnection connection = null;
+            Region partialInteractiveRegion = mTempRegion;
             synchronized (mLock) {
                 // We treat calls from a profile as if made by its parent as profiles
                 // share the accessibility state of the parent. The call below
@@ -2182,13 +2186,17 @@
                         return false;
                     }
                 }
+                if (!mSecurityPolicy.computePartialInteractiveRegionForWindowLocked(
+                        resolvedWindowId, partialInteractiveRegion)) {
+                    partialInteractiveRegion = null;
+                }
             }
             final int interrogatingPid = Binder.getCallingPid();
             final long identityToken = Binder.clearCallingIdentity();
             MagnificationSpec spec = getCompatibleMagnificationSpecLocked(resolvedWindowId);
             try {
-                connection.findAccessibilityNodeInfosByViewId(accessibilityNodeId,
-                        viewIdResName, interactionId, callback, mFetchFlags, interrogatingPid,
+                connection.findAccessibilityNodeInfosByViewId(accessibilityNodeId, viewIdResName,
+                        partialInteractiveRegion, interactionId, callback, mFetchFlags, interrogatingPid,
                         interrogatingTid, spec);
                 return true;
             } catch (RemoteException re) {
@@ -2208,6 +2216,7 @@
                 throws RemoteException {
             final int resolvedWindowId;
             IAccessibilityInteractionConnection connection = null;
+            Region partialInteractiveRegion = mTempRegion;
             synchronized (mLock) {
                 // We treat calls from a profile as if made by its parent as profiles
                 // share the accessibility state of the parent. The call below
@@ -2229,14 +2238,18 @@
                         return false;
                     }
                 }
+                if (!mSecurityPolicy.computePartialInteractiveRegionForWindowLocked(
+                        resolvedWindowId, partialInteractiveRegion)) {
+                    partialInteractiveRegion = null;
+                }
             }
             final int interrogatingPid = Binder.getCallingPid();
             final long identityToken = Binder.clearCallingIdentity();
             MagnificationSpec spec = getCompatibleMagnificationSpecLocked(resolvedWindowId);
             try {
                 connection.findAccessibilityNodeInfosByText(accessibilityNodeId, text,
-                        interactionId, callback, mFetchFlags, interrogatingPid, interrogatingTid,
-                        spec);
+                        partialInteractiveRegion, interactionId, callback, mFetchFlags, interrogatingPid,
+                        interrogatingTid, spec);
                 return true;
             } catch (RemoteException re) {
                 if (DEBUG) {
@@ -2255,6 +2268,7 @@
                 long interrogatingTid) throws RemoteException {
             final int resolvedWindowId;
             IAccessibilityInteractionConnection connection = null;
+            Region partialInteractiveRegion = mTempRegion;
             synchronized (mLock) {
                 // We treat calls from a profile as if made by its parent as profiles
                 // share the accessibility state of the parent. The call below
@@ -2276,14 +2290,18 @@
                         return false;
                     }
                 }
+                if (!mSecurityPolicy.computePartialInteractiveRegionForWindowLocked(
+                        resolvedWindowId, partialInteractiveRegion)) {
+                    partialInteractiveRegion = null;
+                }
             }
             final int interrogatingPid = Binder.getCallingPid();
             final long identityToken = Binder.clearCallingIdentity();
             MagnificationSpec spec = getCompatibleMagnificationSpecLocked(resolvedWindowId);
             try {
                 connection.findAccessibilityNodeInfoByAccessibilityId(accessibilityNodeId,
-                        interactionId, callback, mFetchFlags | flags, interrogatingPid,
-                        interrogatingTid, spec);
+                        partialInteractiveRegion, interactionId, callback, mFetchFlags | flags,
+                        interrogatingPid, interrogatingTid, spec);
                 return true;
             } catch (RemoteException re) {
                 if (DEBUG) {
@@ -2302,6 +2320,7 @@
                 throws RemoteException {
             final int resolvedWindowId;
             IAccessibilityInteractionConnection connection = null;
+            Region partialInteractiveRegion = mTempRegion;
             synchronized (mLock) {
                 // We treat calls from a profile as if made by its parent as profiles
                 // share the accessibility state of the parent. The call below
@@ -2324,13 +2343,17 @@
                         return false;
                     }
                 }
+                if (!mSecurityPolicy.computePartialInteractiveRegionForWindowLocked(
+                        resolvedWindowId, partialInteractiveRegion)) {
+                    partialInteractiveRegion = null;
+                }
             }
             final int interrogatingPid = Binder.getCallingPid();
             final long identityToken = Binder.clearCallingIdentity();
             MagnificationSpec spec = getCompatibleMagnificationSpecLocked(resolvedWindowId);
             try {
-                connection.findFocus(accessibilityNodeId, focusType, interactionId, callback,
-                        mFetchFlags, interrogatingPid, interrogatingTid, spec);
+                connection.findFocus(accessibilityNodeId, focusType, partialInteractiveRegion, interactionId,
+                        callback, mFetchFlags, interrogatingPid, interrogatingTid, spec);
                 return true;
             } catch (RemoteException re) {
                 if (DEBUG) {
@@ -2349,6 +2372,7 @@
                 throws RemoteException {
             final int resolvedWindowId;
             IAccessibilityInteractionConnection connection = null;
+            Region partialInteractiveRegion = mTempRegion;
             synchronized (mLock) {
                 // We treat calls from a profile as if made by its parent as profiles
                 // share the accessibility state of the parent. The call below
@@ -2370,13 +2394,17 @@
                         return false;
                     }
                 }
+                if (!mSecurityPolicy.computePartialInteractiveRegionForWindowLocked(
+                        resolvedWindowId, partialInteractiveRegion)) {
+                    partialInteractiveRegion = null;
+                }
             }
             final int interrogatingPid = Binder.getCallingPid();
             final long identityToken = Binder.clearCallingIdentity();
             MagnificationSpec spec = getCompatibleMagnificationSpecLocked(resolvedWindowId);
             try {
-                connection.focusSearch(accessibilityNodeId, direction, interactionId, callback,
-                        mFetchFlags, interrogatingPid, interrogatingTid, spec);
+                connection.focusSearch(accessibilityNodeId, direction, partialInteractiveRegion, interactionId,
+                        callback, mFetchFlags, interrogatingPid, interrogatingTid, spec);
                 return true;
             } catch (RemoteException re) {
                 if (DEBUG) {
@@ -3288,6 +3316,42 @@
             }
         }
 
+        public boolean computePartialInteractiveRegionForWindowLocked(int windowId,
+                Region outRegion) {
+            if (mWindows == null) {
+                return false;
+            }
+
+            // Windows are ordered in z order so start from the botton and find
+            // the window of interest. After that all windows that cover it should
+            // be subtracted from the resulting region. Note that for accessibility
+            // we are returning only interactive windows.
+            Region windowInteractiveRegion = null;
+            boolean windowInteractiveRegionChanged = false;
+
+            final int windowCount = mWindows.size();
+            for (int i = windowCount - 1; i >= 0; i--) {
+                AccessibilityWindowInfo currentWindow = mWindows.get(i);
+                if (windowInteractiveRegion == null) {
+                    if (currentWindow.getId() == windowId) {
+                        Rect currentWindowBounds = mTempRect;
+                        currentWindow.getBoundsInScreen(currentWindowBounds);
+                        outRegion.set(currentWindowBounds);
+                        windowInteractiveRegion = outRegion;
+                        continue;
+                    }
+                } else {
+                    Rect currentWindowBounds = mTempRect;
+                    currentWindow.getBoundsInScreen(currentWindowBounds);
+                    if (windowInteractiveRegion.op(currentWindowBounds, Region.Op.DIFFERENCE)) {
+                        windowInteractiveRegionChanged = true;
+                    }
+                }
+            }
+
+            return windowInteractiveRegionChanged;
+        }
+
         public void updateEventSourceLocked(AccessibilityEvent event) {
             if ((event.getEventType() & RETRIEVAL_ALLOWING_EVENT_TYPES) == 0) {
                 event.setSource(null);