Exclude a private display from getDisplayIdsForStartingVisibleBackgroundUsers

A private display (e.g. cluster dipslay in Automotive) may not be used
for starting a visible background user, so should be exlcuded from the
results of
ActivityManagerService#getDisplayIdsForStartingVisibleBackgroundUsers.

Bug: 284489759

Test: adb shell cmd activity list-displays-for-starting-users
      atest ActivityManagerServiceTest

Change-Id: Ic34c10cf8736e6870e4a8b9be2eb17ce280a44b3

1 files changed, 1 insertions, 1 deletions

diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index 460ce4484a4b..6231abb78763 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -19520,7 +19520,7 @@ public class ActivityManagerService extends IActivityManager.Stub
             for (Display display : allDisplays) {
                 int displayId = display.getDisplayId();
                 // TODO(b/247592632): check other properties like isSecure or proper display type
-                if (display.isValid()
+                if (display.isValid() && ((display.getFlags() & Display.FLAG_PRIVATE) == 0)
                         && (allowOnDefaultDisplay || displayId != Display.DEFAULT_DISPLAY)) {
                     displayIds[numberValidDisplays++] = displayId;
                 }