CODEWITHSUNDEEP
androidjsongson
Bahram
Bahram

Reputation: 1642

Json parsing with gson returns null object

I am parsing a Json string via gson , this is the Json string

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

and this is the Object which is going to be useed

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);

the list constructed and it has 10 object , but the problem is all of object's data members is null, i dont no what's wrong with this. The Entity is OrmDroid's Entity class.

Upvotes: 4

Views: 6119

Answers (2)

Vladimir Mironov
Vladimir Mironov

Reputation: 30864

Names of the fields in your MyBranch class don't match to the fields in your json so you have to use SerializedName annotation.

import com.google.gson.annotations.SerializedName;

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)
    @SerializedName("ID")
    public int _ID;

    @SerializedName("Name")
    public String _Name;

    @SerializedName("Active")
    public String _Active;
}

EDIT: You can also avoid using SerializedName annotation by simple renaming MyBranch fields:

import com.google.gson.annotations.SerializedName;

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;
}

Upvotes: 6

madlymad
madlymad

Reputation: 6530

Instead of List use ArrayList ?

Gson gson = new Gson();
Type t = new TypeToken<ArrayList<MyBranch >>() {}.getType();     
ArrayList<MyBranch > list = (ArrayList<MyBranch >) gson.fromJson(json, t);

Upvotes: -1

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