android – 使用gson解析Json返回null对象

概述我正在通过gson解析一个Json字符串,这是Json字符串 [{ "ID": 1, "Name": "Australia", "Active": true},{ "ID": 3, "Name": "Kiev", "Active": true},{ "ID": 4, "Name": "South Africa", " 我正在通过gson解析一个Json字符串,这是Json字符串

[{    "ID": 1,"name": "Australia","Active": true},{    "ID": 3,"name": "KIEv",{    "ID": 4,"name": "South Africa",{    "ID": 5,"name": "Stockholm",{    "ID": 6,"name": "Paris",{    "ID": 7,"name": "Moscow",{    "ID": 8,"name": "New York City",{    "ID": 9,"name": "Germany",{    "ID": 10,"name": "copenhagen",{    "ID": 11,"name": "Amsterdam","Active": true}]

这是将被使用的对象

public class MyBranch extends Entity {public MyBranch () {    super();}public MyBranch (int ID,String name,String isActive) {    super();    _ID = ID;    _name = name;    _Active = isActive;}@Column(name = "ID",primaryKey = true)public int _ID;public String _name;public String _Active;}Gson gson = new Gson();Type t = new Typetoken<List<MyBranch >>() {}.getType();     List<MyBranch > List = (List<MyBranch >) gson.fromJson(Json,t);

构造的列表,它有10个对象,但问题是对象的所有数据成员都是null,我不会对此有什么不妥.实体是OrmDroID的实体类.

解决方法 MyBranch类中字段的名称与Json中的字段不匹配,因此您必须使用Serializedname批注.

import com.Google.gson.annotations.Serializedname;public class MyBranch extends Entity {    public MyBranch () {        super();    }    public MyBranch (int ID,String isActive) {        super();        _ID = ID;        _name = name;        _Active = isActive;    }    @Column(name = "ID",primaryKey = true)    @Serializedname("ID")    public int _ID;    @Serializedname("name")    public String _name;    @Serializedname("Active")    public String _Active;}

编辑：
您还可以通过简单重命名MyBranch字段来避免使用Serializedname注释：

import com.Google.gson.annotations.Serializedname;public class MyBranch extends Entity {    public MyBranch () {        super();    }    public MyBranch (int ID,String isActive) {        super();        ID = ID;        name = name;        Active = isActive;    }    @Column(name = "ID",primaryKey = true)    public int ID;    public String name;    public String Active;}

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