android - Volley Cache not get updated -

hi using volley jar in android app cache json data offline mode.it works perfectly.here code

cache cache1 = appcontroller.getinstance().getrequestqueue().getcache();         entry entry1 = cache1.get(url);         if (entry1 != null) {             // fetch data cache             try {                  data2 = new string(entry1.data, "utf-8");                 try {                     parsejsonfeed(new jsonobject(data2));                 } catch (jsonexception e) {                     e.printstacktrace();                 }             } catch (unsupportedencodingexception e) {                 e.printstacktrace();             }          } else {              appcontroller.getinstance().getrequestqueue().getcache().remove(url);             // making fresh volley request , getting json             jsonobjectrequest jsonreq1 = new jsonobjectrequest(method.get,                     url, null, new response.listener<jsonobject>() {                          @override                         public void onresponse(jsonobject response) {                             volleylog.d(tag, "response: " + response.tostring());                             if (response != null) {                                 parsejsonfeed(response);                             }                         }                     }, new response.errorlistener() {                          @override                         public void onerrorresponse(volleyerror error) {                             volleylog.d(tag, "error:" + error.getmessage());                         }                     });              // adding request volley request queue             appcontroller.getinstance().addtorequestqueue(jsonreq1);         }      private void parsejsonfeed(jsonobject response) {         try {              feedarray = response.getjsonarray("events");              (int = 0; < feedarray.length(); i++) {                   feedobj = (jsonobject) feedarray.get(i);                   event_id.add(feedobj.getint("event_id"));                 event_desc.add(feedobj.getstring("event_title"));                 event_date.add(feedobj.getstring("event_date"));                 event_place.add(feedobj.getstring("event_place"));                 event_time.add(feedobj.getstring("event_time"));              }                listview.setadapter(new datalistadapter(event_date,event_desc,event_place,event_time));                  //log.i("event1111", event.tostring());         //  log.i("event2222", event2.tostring());             toast.maketext(getactivity(), "dataa"+event_id, 5000).show();          } catch (jsonexception e) {             e.printstacktrace();     }      } 

my problem got data.but when updated json data,the cache data not update.so how can change cache data based on json data.please me in advance :)

set cache header response of server correctly, think need change max-age of header or custom configuration because volley looks @ header stores response in cache, here how dose:

  headervalue = headers.get("cache-control");         if (headervalue != null) {             hascachecontrol = true;             string[] tokens = headervalue.split(",");             (int = 0; < tokens.length; i++) {                 string token = tokens[i].trim();                 if (token.equals("no-cache") || token.equals("no-store")) {                     return null;                 } else if (token.startswith("max-age=")) {                     try {                         maxage = long.parselong(token.substring(8));                     } catch (exception e) {                     }                 } else if (token.equals("must-revalidate") || token.equals("proxy-revalidate")) {                     maxage = 0;                 }             }         }          headervalue = headers.get("expires");         if (headervalue != null) {             serverexpires = parsedateasepoch(headervalue);         }          serveretag = headers.get("etag");          // cache-control takes precedence on expires header, if both exist , expires         // more restrictive.         if (hascachecontrol) {             softexpire = + maxage * 1000;         } else if (serverdate > 0 && serverexpires >= serverdate) {             // default semantic expire header in http specification softexpire.             softexpire = + (serverexpires - serverdate);         }          cache.entry entry = new cache.entry();         entry.data = response.data;         entry.etag = serveretag;         entry.softttl = softexpire;         entry.ttl = entry.softttl;         entry.serverdate = serverdate;         entry.responseheaders = headers;