Control user switching UI visibility according to config

Bug: 375394047
Test: atest UserDetailsSettingsTest UserSettingsTest
Test: build platform with config overrides, check the result
Flag: EXEMPT Desktop-only change
Change-Id: Iaf1ac6c98a648066bf77b069039dcd59e243835f

src/com/android/settings/users/UserCapabilities.java

@@ -36,6 +36,7 @@ public class UserCapabilities {
     boolean mIsAdmin;
     boolean mIsGuest;
     boolean mIsEphemeral;
+    boolean mUserSwitchingUiEnabled;
     boolean mUserSwitcherEnabled;
     boolean mCanAddGuest;
     boolean mDisallowAddUser;
@@ -68,7 +69,8 @@ public class UserCapabilities {
         caps.mCanAddRestrictedProfile =
                 offerRestricted && !dpm.isDeviceManaged() && userManager.isUserTypeEnabled(
                         UserManager.USER_TYPE_FULL_RESTRICTED);
-
+        caps.mUserSwitchingUiEnabled = context.getResources().getBoolean(
+                com.android.internal.R.bool.config_allowChangeUserSwitcherEnabled);
         caps.updateAddUserCapabilities(context);
         return caps;
     }
@@ -134,6 +136,7 @@ public class UserCapabilities {
                 ", mEnforcedAdmin=" + mEnforcedAdmin +
                 ", mDisallowSwitchUser=" + mDisallowSwitchUser +
                 ", mDisallowAddUserSetByAdmin=" + mDisallowAddUserSetByAdmin +
+                ", mUserSwitchingUiEnabled=" + mUserSwitchingUiEnabled +
                 ", mUserSwitcherEnabled=" + mUserSwitcherEnabled +
                 '}';
     }

src/com/android/settings/users/UserDetailsSettings.java

@@ -354,6 +354,8 @@ public class UserDetailsSettings extends SettingsPreferenceFragment
 
         mGrantAdminPref.setChecked(mUserInfo.isAdmin());
 
+        mSwitchUserPref.setVisible(mUserCaps.mUserSwitchingUiEnabled);
+
         mSwitchUserPref.setTitle(
                 context.getString(com.android.settingslib.R.string.user_switch_to_user,
                         mUserInfo.name));

src/com/android/settings/users/UserSettings.java

@@ -287,7 +287,7 @@ public class UserSettings extends SettingsPreferenceFragment
         final SettingsActivity activity = (SettingsActivity) getActivity();
         final SettingsMainSwitchBar switchBar = activity.getSwitchBar();
         switchBar.setTitle(getContext().getString(R.string.multiple_users_main_switch_title));
-        if (!mUserCaps.mIsGuest) {
+        if (!mUserCaps.mIsGuest && mUserCaps.mUserSwitchingUiEnabled) {
             switchBar.show();
         } else {
             switchBar.hide();