1 files changed, 11 insertions, 0 deletions
diff --git a/core/java/android/app/ActivityView.java b/core/java/android/app/ActivityView.java
index 8ec5e3a43218..0ccaf62d45b2 100644
--- a/core/java/android/app/ActivityView.java
+++ b/core/java/android/app/ActivityView.java
@@ -19,6 +19,7 @@ package android.app;
 import static android.hardware.display.DisplayManager.VIRTUAL_DISPLAY_FLAG_DESTROY_CONTENT_ON_REMOVAL;
 import static android.hardware.display.DisplayManager.VIRTUAL_DISPLAY_FLAG_OWN_CONTENT_ONLY;
 import static android.hardware.display.DisplayManager.VIRTUAL_DISPLAY_FLAG_PUBLIC;
+import static android.view.Display.INVALID_DISPLAY;
 
 import android.annotation.NonNull;
 import android.annotation.TestApi;
@@ -377,6 +378,16 @@ public class ActivityView extends ViewGroup {
     }
 
     /**
+     * @return the display id of the virtual display.
+     */
+    public int getVirtualDisplayId() {
+        if (mVirtualDisplay != null) {
+            return mVirtualDisplay.getDisplay().getDisplayId();
+        }
+        return INVALID_DISPLAY;
+    }
+
+    /**
      * Injects a pair of down/up key events with keycode {@link KeyEvent#KEYCODE_BACK} to the
      * virtual display.
      */