解析Json數據到具有RecyclerView的格子視圖

Question

我指的是這個tuto link。我想在這個網格視圖中從服務器獲取json數據。請告訴我如何解析數據。再加上我需要緩存這些圖像..使用凌亂的圖書館等。 任何鏈接我們tuto你可以提供解析？請建議我快

Answer 1

使用凌空解析您的數據可以這樣實現：

1. 創建類VolleyService 公共類VolleyService {

   private static VolleyService instance; 
   private RequestQueue requestQueue; 
   private ImageLoader imageLoader; 
   
   private VolleyService(Context context) { 
       requestQueue = Volley.newRequestQueue(context); 
   
       imageLoader = new ImageLoader(requestQueue, new ImageLoader.ImageCache() { 
        private final LruCache<String, Bitmap> cache = new LruCache<String, Bitmap>(20); 
   
        @Override 
        public Bitmap getBitmap(String url) { 
         return cache.get(url); 
        } 
   
        @Override 
        public void putBitmap(String url, Bitmap bitmap) { 
         cache.put(url,bitmap); 
        } 
       }); 
   } 
   
   public static VolleyService getInstance(Context context) { 
       if (instance == null) { 
        instance = new VolleyService(context); 
       } 
       return instance; 
   } 
   
   public RequestQueue getRequestQueue() { 
       return requestQueue; 
   } 
   
   public ImageLoader getImageLoader() { 
       return imageLoader; 
   } 
   

   }

2. 使用方法如下這用於創建請求並獲取URL的JSON響應：

   請求隊列隊列=

   VolleyService.getInstance(this.getContext()).getRequestQueue();  
       StringRequest request = new StringRequest(url, new 
       Response.Listener<String>() { 
        @Override 
        public void onResponse(String response) { 
         // we got the response, now our job is to handle it 
         try { 
          updateArticleData(response, syncResult,categoryID); 
         } catch (RemoteException | OperationApplicationException e) { 
          e.printStackTrace(); 
         } 
        } 
       }, new Response.ErrorListener() { 
   
        @Override 
        public void onErrorResponse(VolleyError error) { 
         //something happened, treat the error. 
         Log.e("Error", error.toString()); 
        } 
       }); 
   
       queue.add(request); 
   

3. Mehod getJsonFromResponse（響應）：

   private SomeClass getDataFromJson(String json) {  
       //Do sth with json  
       return someData; 
   }