Android－Expected a string but was BEGIN_ARRAY at line 一 column 50

今天在用bmob的时候，报了“Expected a string but was BEGIN_ARRAY at line 1 column 50“这个错误，开始我没有注意，以为是网络引起的错误，后来总是报错，所以仔细看了一下，期待一个String类型却是一个array类型，心想，这肯定报错啊。
传回来的是json数据，映射到这个实体类。

public class Notice extends BmobObject{    private String name;    private String image;    private String desc;    private String url;    private String function;    private String type;    private String[] functions;    private String[] foodInfos;    private BmobRelation steps;    private BmobRelation condiments;    下面省略setter getter方法。。。｝

注意functions,foodInfos两个字段。
json返回的数据是{“xxx”:”xxx”….,”functions”:”{[1],[2],[3]}”,”foodInfos”:”{[1],[2],[3]}”,”xxxx”:”xxxx”}
返回的是array。问题找到了。动手解决。如果是使用Gson的话，就按照下面，我现在用的bmob,果然是比较受限了，必须得修改数据，符合字段要求。

public class Notice extends BmobObject{    private String name;    private String image;    private String desc;    private String url;    private String function;    private String type;    private List<String> functions;    private List<String> foodInfos;    private BmobRelation steps;    private BmobRelation condiments;    下面省略setter getter方法。。。｝