public static boolean setUserToken(String userToken) {
   return FurryRobotExport.setStringSharedPreference(USER_KEY, userToken);
 }
 public static boolean unsetUser() {
   return FurryRobotExport.unsetSharedPreference(USER_KEY);
 }
 public static String getUserToken() {
   return FurryRobotExport.getStringSharedPreference(USER_KEY, null);
 }