排空緩存爲空

即時通訊使用排球，我有檢索緩存問題。每次我要訪問緩存以供顯示時它都是空的。但是當我在SD卡上檢查它時，我可以在我的應用程序中看到緩存文件夾下的文件。排空緩存爲空

// We first check for cached request 
    Cache cache = AppController.getInstance().getRequestQueue().getCache(); 
    Cache.Entry entry = cache.get(URL_DASHBOARD); 

    AppController.getInstance().getRequestQueue().getCache().invalidate(URL_DASHBOARD, true); 

    if (entry != null) { 
     // fetch the data from cache 
     try { 
      String data = new String(entry.data, "UTF-8"); 
      try { 
       JSONObject temp = new JSONObject(data); 
       Log.e(TAG,"loadVolleyConnection: fetch data from cache: "+temp.toString()); 
       setAdapter_dashboard(temp.getJSONArray(JSON_DASHBOARD.ARRAY_DASHBOARD.getVal().toString())); 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 
     } catch (UnsupportedEncodingException e) { 
      e.printStackTrace(); 
     } 
    } else { 
     Log.e(TAG,"loadVolleyConnection: query to api 「); 
    executeVolleyRequest(URL_DASHBOARD); 
    }

executeVolleyRequest

/**Execute Volley*/ 
private void executeVolleyRequest(String path){ 
    //Making fresh volley request and getting json array 
    String tag_string_req = "string_req"; 
    StringRequest stringRequest = new StringRequest(Request.Method.POST,path, 
      new Response.Listener<String>() { 
       @Override 
       public void onResponse(String response) { 
        Log.e(TAG,"loadVolleyConnection: fetch data from api: "+response); 
        try { 
         JSONObject temp_obj = new JSONObject(response); 
         JSONArray temp_array = temp_obj.getJSONArray(JSON_DASHBOARD.ARRAY_DASHBOARD.getVal().toString()); 
         setAdapter_dashboard(temp_array); 
         if(isRefreshed){ 
          // Call onRefreshComplete when the list has been refreshed. 
          (myListView).onRefreshComplete(); 
          isRefreshed = false; 
          setUpdate(temp_array); 
          Log.e(TAG,"loadVolleyConnection: isRefreshed.."); 
         }else{ 
          setAdapter_dashboard(temp_array); 
         } 

        } catch (JSONException e) { 
         e.printStackTrace(); 
        } 
       } 
      }, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError volleyError) { 
       Log.e(TAG, "Error: " + volleyError.getClass().getSimpleName()); 
       if (volleyError.networkResponse == null) { 
        if (volleyError.getClass().equals(TimeoutError.class)) { 
         // Show timeout error message 
         Alertmessage("Login Error","Oops.Timeout error!Please check your connection."); 
        } 
       }else{ 
        Alertmessage("Login Error","Check your Connection./n"); 
       } 
       //pDialog.dismiss(); 
      } 
    }){ 
    }; 

    stringRequest.setRetryPolicy(new DefaultRetryPolicy(5000,2,1)); 
    stringRequest.setShouldCache(true); 
    // Adding request to request queue 
    AppController.getInstance().addToRequestQueue(stringRequest, tag_string_req); 


}

我想不出我缺少什麼。

感謝

來源

2014-09-23 chkm8

後，測試了幾次，我發現，當你使用凌空，當你希望有一個緩存，你需要使用一個GET請求無法發佈。

但我的問題是，有沒有辦法，我們仍然可以使用緩存時使用後？

來源

2014-09-24 01:11:44 chkm8

根據RFC 2616第9.5節：「對POST方法的響應不可緩存，除非響應包含適當的Cache-Control或Expires標頭字段。」 http://stackoverflow.com/a/828080/1022454 – 2014-10-02 09:12:42

排空緩存爲空

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