java - Data from JSON does not refresh -
i'm developing json parsing app in android, have php script on server fetch data mysql database , encode json, app contact server , populate listview data json using asynctaskloader . it's worked if drop database records, start app again, listview still shows old data. press refresh button call asynctaskloader still old data. don't know why please me.
thank p/s: sorry bad english ^^
sorry, forgot code. here go
tvschedfragment.java
public class tvschedfragment extends listfragment { private tvschedadapter adpt; listview lview; // json node names private static final string tag_schedule = "sched"; private static string url = "http://192.168.20.205/dom/app/json.php"; string jsonstr; @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) { view rootview = inflater.inflate(r.layout.fragment_tvsched, container, false); lview = (listview) rootview.findviewbyid(android.r.id.list); adpt = new tvschedadapter(new arraylist<tvschedmodel>(), getactivity()); lview.setadapter(adpt); (new asynclistviewloader()).execute(); return rootview; } @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); sethasoptionsmenu(true); } @override public void oncreateoptionsmenu(menu menu, menuinflater inflater) { inflater.inflate(r.menu.menu_tvsched, menu); super.oncreateoptionsmenu(menu, inflater); } @override public boolean onoptionsitemselected(menuitem item) { switch (item.getitemid()) { case r.id.menu_tvsched_refresh: (new asynclistviewloader()).execute(); return true; } return super.onoptionsitemselected(item); } @override public void onactivitycreated(bundle savedinstancestate) { super.onactivitycreated(savedinstancestate); } private class asynclistviewloader extends asynctask<string, void, list<tvschedmodel>> { private final progressdialog dialog = new progressdialog(getactivity()); @override protected void onpostexecute(list<tvschedmodel> result) { super.onpostexecute(result); dialog.dismiss(); adpt.setitemlist(result); adpt.notifydatasetchanged(); } @override protected void onpreexecute() { super.onpreexecute(); dialog.setmessage("downloading schedule..."); dialog.show(); } @override protected list<tvschedmodel> doinbackground(string... params) { list<tvschedmodel> result = new arraylist<tvschedmodel>(); servicehandler sh = new servicehandler(); // making request url , getting response jsonstr = sh.makeservicecall(url, servicehandler.get); log.d("response: ", "> " + jsonstr); try { jsonobject jsonobj = new jsonobject(jsonstr); // getting json array node jsonarray contacts = jsonobj.getjsonarray(tag_schedule); (int = 0; < contacts.length(); i++) { result.add(convertsched(contacts.getjsonobject(i))); } return result; } catch (throwable t) { t.printstacktrace(); } return null; } private tvschedmodel convertsched(jsonobject obj) throws jsonexception { string name = obj.getstring("program"); string desc = obj.getstring("description"); string time = obj.getstring("datetimestring"); string chan = obj.getstring("channel"); return new tvschedmodel(time, name, desc, chan); } } @override public void ondestroy() { super.ondestroy(); adpt.clear(); } } servicehandler.java
public class servicehandler { static string response = null; public final static int = 1; public final static int post = 2; public servicehandler() { } /* * making service call * @url - url make request * @method - http request method * */ public string makeservicecall(string url, int method) { return this.makeservicecall(url, method, null); } /* * making service call * @url - url make request * @method - http request method * @params - http request params * */ public string makeservicecall(string url, int method, list<namevaluepair> params) { try { // http client defaulthttpclient httpclient = new defaulthttpclient(); httpentity httpentity = null; httpresponse httpresponse = null; // checking http request method type if (method == post) { httppost httppost = new httppost(url); // adding post params if (params != null) { httppost.setentity(new urlencodedformentity(params)); } httpresponse = httpclient.execute(httppost); } else if (method == get) { // appending params url if (params != null) { string paramstring = urlencodedutils .format(params, "utf-8"); url += "?" + paramstring; } httpget httpget = new httpget(url); httpresponse = httpclient.execute(httpget); } httpentity = httpresponse.getentity(); response = entityutils.tostring(httpentity); } catch (unsupportedencodingexception e) { e.printstacktrace(); } catch (clientprotocolexception e) { e.printstacktrace(); } catch (ioexception e) { e.printstacktrace(); } return response; } }
if using arrayadapter show list view clear array list on finish() or whenever refresh list.clear previous list store updated data , call adapter.notifydatachanged();.
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