public static @UserIdInt int[] getProfileIdsIncludingDisabled(final Context context) {
		if (Hacks.UserManager_getProfileIds != null)
			return Hacks.UserManager_getProfileIds.invoke(UserHandles.MY_USER_ID, false).on(requireNonNull(context.getSystemService(UserManager.class)));
		else return requireNonNull(context.getSystemService(UserManager.class)).getUserProfiles().stream().mapToInt(Users::toId).toArray();	// Fallback to profiles without disabled.
	}
@return error information, or empty string for success.
shared/src/main/java/com/oasisfeng/island/engine/IslandManager.java