WordPress的API - 如何循環通過JSON Android/Java中的對象數組

Question

我是JSON的新手，我正在面臨艱難的時間循環JSONArray內的JSONArray爲我正在構建的Android應用程序。我會很感激，如果海報會給出解決方案的簡要解釋，因爲我只是不想複製&粘貼代碼，但瞭解它。謝謝。

API鏈接：https://public-api.wordpress.com/wp/v2/sites/spoketest.wordpress.com/categories

API輸出：

[ 
{ 
    "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 
      } 
     ] 
    } 
} 
] 

我的代碼：

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; 
} 
} 

Answer 1

一旦檢索來自API的響應（使用AsyncTask），tak e響應文本並創建一個JSONArray。然後，您可以遍歷數組並提取類別。

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... 
} 

編輯：我看你硬編碼一些值到您的fromJSON，所以我想我會發布的一個修正版本，以及。

public static Category fromJSON(JSONObject jsonObject) { 
    try { 
     Category category = new Category(); 
     category.mCategoryID = jsonObject.getInt("id"); 
     category.mCategoryName = jsonObjectgetString("name"); 

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