code: @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
      public static UserManager getUserManager(Context context) {
          return (UserManager) context.getSystemService(Context.USER_SERVICE);
      }
docs: Get the {@link android.os.UserManager} service for this context.
  @param context the context.
  @return the {@link android.os.UserManager}