Question

我的json看起来像这样：

[{
    "id":14,
    "namelanguage1":"Książka",
    "namelanguage2":"das Buch",
    "tags":
    [{
        "id":2,
        "name":"Szkoła",
        "language_user_id":null,
        "created_at":"2014-04-11T17:30:28.356Z",
        "updated_at":"2014-04-11T17:30:28.356Z",
        "user_id":2
    }],
    "language1_id":5,
    "language2_id":1,
},
{
    "id":15,
    "namelanguage1":"das Fußball",
    "namelanguage2":"Piłka nożna",
    "tags":[{
        "id":2,
        "name":"Szkoła",
        "language_user_id":null,
        "created_at":"2014-04-11T17:30:28.356Z",
        "updated_at":"2014-04-11T17:30:28.356Z",
        "user_id":2
    },
    {
        "id":3,
        "name":"Sport",
        "language_user_id":null,
        "created_at":"2014-04-11T17:30:33.059Z",
        "updated_at":"2014-04-11T17:30:36.769Z",
        "user_id":2
    }],
    "language1_id":1,
    "language2_id":5,
}]

我不知道如何获取标签ID。现在我有了这个：

    public class Word {
        @SerializedName("id")
        public long id;
        @SerializedName("namelanguage1")
        public String nameLanguage1;
        @SerializedName("namelanguage2")
        public String nameLanguage2;

        @SerializedName("language1_id")
        public long language1_id;
        @SerializedName("language2_id")
        public long language2_id;
public ArrayList<Tag> tags;

和它的吸气剂和制定者。我不知道如何获取标签的ID。我尝试理解这个例子：example from stackoverflow但我仍然不知道如何做到这一点。

我在代码中的表现如何：

words = VolleyDemoApplication.obtain().getGson()
                    .fromJson(response, new TypeToken<ArrayList<Word>>() {
                    }.getType());

我从这样的词中得到了值：

 word.getNameLanguage1() + " " +word.getLanguage1_id() + " " + word.getNameLanguage2()+ " " + word.getLanguage2_id() + " " + word.getTags().

这里word.getTags().我不知道写什么。

Answer 1

有几件事需要指出，我不知道为什么这个代码适合你，当你打印的json不正确时。

实际格式为：

[
{
    "id": 14,
    "namelanguage1": "aaa",
    "namelanguage2": "das Buch",
    "tags": [
        {
            "id": 2,
            "name": "bbb",
            "language_user_id": null,
            "created_at": "2014-04-11T17:30:28.356Z",
            "updated_at": "2014-04-11T17:30:28.356Z",
            "user_id": 2
        }
    ],
    "language1_id": 5,
    "language2_id": 1 ->> remove the comma here thats in your json text
},
{
    "id": 15,
    "namelanguage1": "zzz",
    "namelanguage2": "yyy",
    "tags": [
        {
            "id": 2,
            "name": "ccc",
            "language_user_id": null,
            "created_at": "2014-04-11T17:30:28.356Z",
            "updated_at": "2014-04-11T17:30:28.356Z",
            "user_id": 2
        },
        {
            "id": 3,
            "name": "Sport",
            "language_user_id": null,
            "created_at": "2014-04-11T17:30:33.059Z",
            "updated_at": "2014-04-11T17:30:36.769Z",
            "user_id": 2
        }
    ],
    "language1_id": 1,
    "language2_id": 5 ->> remopve the comma here too
}
]

对于SerializedName arraylist，类字需要tags。

@SerializedName(value="tags")
public ArrayList<Tag> tags;

您还需要创建标签类：

public class Tag {
@SerializedName(value="id")
private int id;
@SerializedName(value="name")
private String tagName;
@SerializedName(value="language_user_id")
private String languageUserId;
@SerializedName(value="created_at")
private String createdAt;
@SerializedName(value="updated_at")
private String updatedAt;
@SerializedName(value="user_id")
private int userId;

    // create getters and setters or else change the modifiers to public
}

您将在Tag类中访问ID，如下所示：

words.get(0).tags.get(0).getId(); ->> i am using 0 since its the first element, you will need a loop for this

或

words.get(0).tags.get(0).id;

希望有所帮助。

GSON;对象列表中的对象列表

1 个答案: