Android：如何檢查是否使用volley將JSON數據成功發送到服務器？

Question

我想從我的應用程序發送JSON數據到服務器。我正在使用排球庫。我在這裏看到這個問題Volley send JSONObject to server with POST method。我設法從服務器獲得響應，這是「正常」，但是當我試圖發送數據或者我已經成功將它發送到服務器時，我錯過了什麼？

我的數據被存儲在內部JSONObject d，看起來像

{ "temp_mC":0, 
    "humidity_ppm":28430, 
    "pressure_Pa":101242, 
    "temp2_mC":32937, 
    "co_mV":238, 
    "no2_mV":1812, 
    "noise_dB":79,  
} 

我稱之爲發佈數據

public void postData(JSONObject d) { 
    try { 

     final String requestBody = d.toString(); 

     StringRequest stringRequest = new StringRequest(1, "http:.....", new Response.Listener<String>() { 
      @Override 
      public void onResponse(String response) { 
       Log.d("Response",response); 
      } 
     }, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       Log.e("Error:",error.toString()); 
      } 
     }) { 
      @Override 
      public String getBodyContentType() { 
       return String.format("application/json; charset=utf-8"); 
      } 

      @Override 
      public byte[] getBody() throws AuthFailureError { 
       try { 
        return requestBody == null ? null : requestBody.getBytes("utf-8"); 
       } catch (UnsupportedEncodingException uee) { 
        VolleyLog.wtf("Unsupported Encoding while trying to get the bytes of %s using %s", 
          requestBody, "utf-8"); 
        return null; 
       } 
      } 
     }; 
     MySingleton.getInstance(this).addToRequestQueue(stringRequest); 

    } catch (Exception e) { 
     e.printStackTrace(); 
    } 


} 

而且MySingleton類，這是從示例代碼的方法

public class MySingleton { 
private static MySingleton mInstance; 
private RequestQueue mRequestQueue; 
private ImageLoader mImageLoader; 
private static Context mCtx; 

private MySingleton(Context context) { 
    mCtx = context; 
    mRequestQueue = getRequestQueue(); 

    mImageLoader = new ImageLoader(mRequestQueue, 
      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 synchronized MySingleton getInstance(Context context) { 
    if (mInstance == null) { 
     mInstance = new MySingleton(context); 
    } 
    return mInstance; 
} 

public RequestQueue getRequestQueue() { 
    if (mRequestQueue == null) { 
     // getApplicationContext() is key, it keeps you from leaking the 
     // Activity or BroadcastReceiver if someone passes one in. 
     mRequestQueue = Volley.newRequestQueue(mCtx.getApplicationContext()); 
    } 
    return mRequestQueue; 
} 

public <T> void addToRequestQueue(Request<T> req) { 
    getRequestQueue().add(req); 
} 

public ImageLoader getImageLoader() { 
    return mImageLoader; 
} 
} 

Answer 1

如果你從服務器得到確定，那麼最合理的事情就是數據已經存在en發送。我們不知道當你發送錯誤的數據時，你使用什麼服務器以及服務器返回到客戶端。

也許你的服務器在你發送錯誤的數據時也發送OK狀態（200），你應該檢查你的服務器，如果一切正常的話，從響應中排除一切似乎都很好。

Answer 2

onResponse檢查內完成成功您的請求中狀態碼類似下面如果狀態碼後爲200它的意思是你的要求成功執行

private NetworkResponse networkResponse; 
@Override 
protected Response<String> parseNetworkResponse(NetworkResponse response) { 
    networkResponse = response; 
    return super.parseNetworkResponse(response); 

} 

@Override 
     public void onResponse(String response) { 
      if(networkResponse.statusCode==200) 
      { 
       // then perform your task 
       Log.d("Response",response); 
      } 
     }