WordPressAPI-如何在Android/Java中循环通过JSON对象数组

我是JSON新手，我正在构建一个Android应用程序，在JSONArray中通过JSONObject进行循环时遇到了困难。如果海报也能给大众一个简单的解释，我会很感激，因为我只是不想复制和粘贴代码，但能理解它。多谢各位

API链接：

API输出：

[
{
    "id": 5580,
    "count": 5,
    "description": "",
    "link": "https://spoketest.wordpress.com/category/diversions/",
    "name": "Diversions",
    "slug": "diversions",
    "taxonomy": "category",
    "parent": 0,
    "meta": [],
    "_links": {
        "self": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories/5580"
            }
        ],
        "collection": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories"
            }
        ],
        "about": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/taxonomies/category"
            }
        ],
        "wp:post_type": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/posts?categories=5580"
            }
        ],
        "curies": [
            {
                "name": "wp",
                "href": "https://api.w.org/{rel}",
                "templated": true
            }
        ]
    }
},
{
    "id": 9548,
    "count": 5,
    "description": "",
    "link": "https://spoketest.wordpress.com/category/features/",
    "name": "Features",
    "slug": "features",
    "taxonomy": "category",
    "parent": 0,
    "meta": [],
    "_links": {
        "self": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories/9548"
            }
        ],
        "collection": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories"
            }
        ],
        "about": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/taxonomies/category"
            }
        ],
        "wp:post_type": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/posts?categories=9548"
            }
        ],
        "curies": [
            {
                "name": "wp",
                "href": "https://api.w.org/{rel}",
                "templated": true
            }
        ]
    }
},
{
    "id": 103,
    "count": 10,
    "description": "",
    "link": "https://spoketest.wordpress.com/category/news/",
    "name": "News",
    "slug": "news",
    "taxonomy": "category",
    "parent": 0,
    "meta": [],
    "_links": {
        "self": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories/103"
            }
        ],
        "collection": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories"
            }
        ],
        "about": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/taxonomies/category"
            }
        ],
        "wp:post_type": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/posts?categories=103"
            }
        ],
        "curies": [
            {
                "name": "wp",
                "href": "https://api.w.org/{rel}",
                "templated": true
            }
        ]
    }
},
{
    "id": 660,
    "count": 10,
    "description": "",
    "link": "https://spoketest.wordpress.com/category/people/",
    "name": "People",
    "slug": "people",
    "taxonomy": "category",
    "parent": 0,
    "meta": [],
    "_links": {
        "self": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories/660"
            }
        ],
        "collection": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories"
            }
        ],
        "about": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/taxonomies/category"
            }
        ],
        "wp:post_type": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/posts?categories=660"
            }
        ],
        "curies": [
            {
                "name": "wp",
                "href": "https://api.w.org/{rel}",
                "templated": true
            }
        ]
    }
},
{
    "id": 318,
    "count": 10,
    "description": "",
    "link": "https://spoketest.wordpress.com/category/tech/",
    "name": "Tech",
    "slug": "tech",
    "taxonomy": "category",
    "parent": 0,
    "meta": [],
    "_links": {
        "self": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories/318"
            }
        ],
        "collection": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories"
            }
        ],
        "about": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/taxonomies/category"
            }
        ],
        "wp:post_type": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/posts?categories=318"
            }
        ],
        "curies": [
            {
                "name": "wp",
                "href": "https://api.w.org/{rel}",
                "templated": true
            }
        ]
    }
},
{
    "id": 160479,
    "count": 6,
    "description": "",
    "link": "https://spoketest.wordpress.com/category/traction/",
    "name": "Traction",
    "slug": "traction",
    "taxonomy": "category",
    "parent": 0,
    "meta": [],
    "_links": {
        "self": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories/160479"
            }
        ],
        "collection": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories"
            }
        ],
        "about": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/taxonomies/category"
            }
        ],
        "wp:post_type": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/posts?categories=160479"
            }
        ],
        "curies": [
            {
                "name": "wp",
                "href": "https://api.w.org/{rel}",
                "templated": true
            }
        ]
    }
}
]

import org.json.JSONException;
import org.json.JSONObject;

public class Category {
private int mCategoryID;
private String mCategoryName;

public static Category fromJSON(JSONArray jsonArray) {
    try {
        Category category = new Category();
        category.mCategoryID = jsonArray.getJSONObject("0").getInt("id");
        category.mCategoryName = jsonArray.getJSONObject("0").getString("name");

        return category;
    } catch (JSONException e) {
        e.printStackTrace();
        return null;
    }
}

public int getCategoryID() {
    return mCategoryID;
}

public String getCategoryName() {
    return mCategoryName;
}
}

我的代码：

[
{
    "id": 5580,
    "count": 5,
    "description": "",
    "link": "https://spoketest.wordpress.com/category/diversions/",
    "name": "Diversions",
    "slug": "diversions",
    "taxonomy": "category",
    "parent": 0,
    "meta": [],
    "_links": {
        "self": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories/5580"
            }
        ],
        "collection": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories"
            }
        ],
        "about": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/taxonomies/category"
            }
        ],
        "wp:post_type": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/posts?categories=5580"
            }
        ],
        "curies": [
            {
                "name": "wp",
                "href": "https://api.w.org/{rel}",
                "templated": true
            }
        ]
    }
},
{
    "id": 9548,
    "count": 5,
    "description": "",
    "link": "https://spoketest.wordpress.com/category/features/",
    "name": "Features",
    "slug": "features",
    "taxonomy": "category",
    "parent": 0,
    "meta": [],
    "_links": {
        "self": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories/9548"
            }
        ],
        "collection": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories"
            }
        ],
        "about": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/taxonomies/category"
            }
        ],
        "wp:post_type": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/posts?categories=9548"
            }
        ],
        "curies": [
            {
                "name": "wp",
                "href": "https://api.w.org/{rel}",
                "templated": true
            }
        ]
    }
},
{
    "id": 103,
    "count": 10,
    "description": "",
    "link": "https://spoketest.wordpress.com/category/news/",
    "name": "News",
    "slug": "news",
    "taxonomy": "category",
    "parent": 0,
    "meta": [],
    "_links": {
        "self": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories/103"
            }
        ],
        "collection": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories"
            }
        ],
        "about": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/taxonomies/category"
            }
        ],
        "wp:post_type": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/posts?categories=103"
            }
        ],
        "curies": [
            {
                "name": "wp",
                "href": "https://api.w.org/{rel}",
                "templated": true
            }
        ]
    }
},
{
    "id": 660,
    "count": 10,
    "description": "",
    "link": "https://spoketest.wordpress.com/category/people/",
    "name": "People",
    "slug": "people",
    "taxonomy": "category",
    "parent": 0,
    "meta": [],
    "_links": {
        "self": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories/660"
            }
        ],
        "collection": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories"
            }
        ],
        "about": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/taxonomies/category"
            }
        ],
        "wp:post_type": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/posts?categories=660"
            }
        ],
        "curies": [
            {
                "name": "wp",
                "href": "https://api.w.org/{rel}",
                "templated": true
            }
        ]
    }
},
{
    "id": 318,
    "count": 10,
    "description": "",
    "link": "https://spoketest.wordpress.com/category/tech/",
    "name": "Tech",
    "slug": "tech",
    "taxonomy": "category",
    "parent": 0,
    "meta": [],
    "_links": {
        "self": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories/318"
            }
        ],
        "collection": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories"
            }
        ],
        "about": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/taxonomies/category"
            }
        ],
        "wp:post_type": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/posts?categories=318"
            }
        ],
        "curies": [
            {
                "name": "wp",
                "href": "https://api.w.org/{rel}",
                "templated": true
            }
        ]
    }
},
{
    "id": 160479,
    "count": 6,
    "description": "",
    "link": "https://spoketest.wordpress.com/category/traction/",
    "name": "Traction",
    "slug": "traction",
    "taxonomy": "category",
    "parent": 0,
    "meta": [],
    "_links": {
        "self": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories/160479"
            }
        ],
        "collection": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories"
            }
        ],
        "about": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/taxonomies/category"
            }
        ],
        "wp:post_type": [
            {
                "href": "https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/posts?categories=160479"
            }
        ],
        "curies": [
            {
                "name": "wp",
                "href": "https://api.w.org/{rel}",
                "templated": true
            }
        ]
    }
}
]

import org.json.JSONException;
import org.json.JSONObject;

public class Category {
private int mCategoryID;
private String mCategoryName;

public static Category fromJSON(JSONArray jsonArray) {
    try {
        Category category = new Category();
        category.mCategoryID = jsonArray.getJSONObject("0").getInt("id");
        category.mCategoryName = jsonArray.getJSONObject("0").getString("name");

        return category;
    } catch (JSONException e) {
        e.printStackTrace();
        return null;
    }
}

public int getCategoryID() {
    return mCategoryID;
}

public String getCategoryName() {
    return mCategoryName;
}
}

---

从API检索响应后（使用

AsyncTask

），获取响应文本并创建

JSONArray

。然后可以循环遍历数组并提取类别

public void onApiResponse(String response) {
    // Create a JSONArray from the response
    JSONArray jsonArray = new JSONArray(response);

    // Create a structure to store all of the categories
    List<Category> categories = new ArrayList<Category>();

    // Loop through the array and parse all the categories
    for (int i = 0; i < jsonArray.length(); i++) {
        // Extract the JSONObject from the index
        JSONObject jsonCategory = jsonArray.getJSONObject(i);

        // Add the category to the list
        categories.add(Category.fromJSON(jsonCategory));
    }

    // Do something with your categories...
}

---

我使用James Smith的Android异步Http客户端库来执行异步相关任务（），它返回JSONObject。我的fromJSON方法将JSONObject作为解析数据的输入参数。现在在您的解决方案中，我需要一个字符串作为输入参数。我可以使用toString（）将JSONObject转换为字符串而不产生任何不利影响吗？您发布的示例响应是JSON数组，而不是JSON对象。如果您在响应中接收到一个JSON对象，则表示库没有正确解释响应，或者您没有正确解释返回值。打印出

JSONObject

的

toString（）

，并与API中的实际文本进行比较，看看哪里出了问题。噢！我犯了一个错误。是的，我得到一个JSONArray，fromJSON的输入参数是JSONArray。但是再一次，我可以在JSONArray上使用toString而不产生任何负面影响吗？理论上，你应该可以，但这会带来很多可以避免的低效。花点时间让我的答案适应你的代码，不要只是复制和粘贴。好的！行。非常感谢。