Added UserManager.isUsersOnSecondaryDisplaysSupported()

By default it reads the value from
config_multiuserUsersOnSecondaryDisplays
overridden by the system property for development purposes.

Test: adb shell setprop fw.users_on_secondary_displays true && \
      adb shell dumpsys user | grep -i "secondary display"

Fixes: 240613396

Change-Id: I1428a117a683e99fcaef71492be297c844d520e2

core/java/android/os/UserManager.java

@@ -2837,6 +2837,26 @@ public class UserManager {
         }
     }
 
+    /**
+     * @hide
+     */
+    public static boolean isUsersOnSecondaryDisplaysEnabled() {
+        return SystemProperties.getBoolean("fw.users_on_secondary_displays",
+                Resources.getSystem()
+                        .getBoolean(R.bool.config_multiuserUsersOnSecondaryDisplays));
+    }
+
+    /**
+     * Returns whether the device allows users to run (and launch activities) on secondary displays.
+     *
+     * @return {@code false} for most devices, except automotive vehicles with passenger displays.
+     *
+     * @hide
+     */
+    public boolean isUsersOnSecondaryDisplaysSupported() {
+        return isUsersOnSecondaryDisplaysEnabled();
+    }
+
     /**
      * Return whether the context user is running in an "unlocked" state.
      * <p>

core/res/res/values/config.xml

@@ -2629,6 +2629,10 @@
          will be locked. -->
     <bool name="config_multiuserDelayUserDataLocking">false</bool>
 
+    <!-- Whether the device allows users to start in background on secondary displays.
+         Should be false for most devices, except automotive vehicle with passenger displays. -->
+    <bool name="config_multiuserUsersOnSecondaryDisplays">false</bool>
+
     <!-- Whether to automatically switch a non-primary user back to the primary user after a
          timeout when the device is docked.  -->
     <bool name="config_enableTimeoutToUserZeroWhenDocked">false</bool>

core/res/res/values/symbols.xml

@@ -453,6 +453,7 @@
   <java-symbol type="integer" name="config_multiuserMaximumUsers" />
   <java-symbol type="integer" name="config_multiuserMaxRunningUsers" />
   <java-symbol type="bool" name="config_multiuserDelayUserDataLocking" />
+  <java-symbol type="bool" name="config_multiuserUsersOnSecondaryDisplays" />
   <java-symbol type="bool" name="config_enableTimeoutToUserZeroWhenDocked" />
   <java-symbol type="integer" name="config_userTypePackageWhitelistMode"/>
   <java-symbol type="xml" name="config_user_types" />

services/core/java/com/android/server/pm/UserManagerService.java

@@ -6010,6 +6010,10 @@ public class UserManagerService extends IUserManager.Stub {
 
         } // synchronized (mPackagesLock)
 
+        // Multiple Users on Multiple Display info
+        pw.println("  Supports users on secondary displays: "
+                + UserManager.isUsersOnSecondaryDisplaysEnabled());
+
         // Dump some capabilities
         pw.println();
         pw.print("  Max users: " + UserManager.getMaxSupportedUsers());