2 files changed, 14 insertions, 0 deletions
diff --git a/core/java/android/app/ActivityClient.java b/core/java/android/app/ActivityClient.java
index bd4386885dd6..2efdf51612c7 100644
--- a/core/java/android/app/ActivityClient.java
+++ b/core/java/android/app/ActivityClient.java
@@ -16,6 +16,7 @@
 
 package android.app;
 
+import android.annotation.Nullable;
 import android.content.ComponentName;
 import android.content.Intent;
 import android.content.res.Configuration;
@@ -205,6 +206,18 @@ public class ActivityClient {
         }
     }
 
+    /**
+     * Returns the activity token below in the same task if it belongs to the same process.
+     */
+    @Nullable
+    public IBinder getActivityTokenBelow(IBinder activityToken) {
+        try {
+            return getActivityClientController().getActivityTokenBelow(activityToken);
+        } catch (RemoteException e) {
+            throw e.rethrowFromSystemServer();
+        }
+    }
+
     ComponentName getCallingActivity(IBinder token) {
         try {
             return getActivityClientController().getCallingActivity(token);
diff --git a/core/java/android/app/IActivityClientController.aidl b/core/java/android/app/IActivityClientController.aidl
index c6649692d848..aba6eb9229f2 100644
--- a/core/java/android/app/IActivityClientController.aidl
+++ b/core/java/android/app/IActivityClientController.aidl
@@ -70,6 +70,7 @@ interface IActivityClientController {
     boolean willActivityBeVisible(in IBinder token);
     int getDisplayId(in IBinder activityToken);
     int getTaskForActivity(in IBinder token, in boolean onlyRoot);
+    IBinder getActivityTokenBelow(IBinder token);
     ComponentName getCallingActivity(in IBinder token);
     String getCallingPackage(in IBinder token);
     int getLaunchedFromUid(in IBinder token);