read from json (string) android with Gson -
its json file
{"visitorslist":[{"visitorid":"09005451","visitorname":" xxxx","visitorphon":"","visitoraddr":"xxxx","geocode":"","autokey":1},{"visitorid":"09005468","visitorname":"xxxxxx","visitorphon":"09005468","visitoraddr":"xxxx","geocode":"","autokey":2}]} and wanna read , show information file listview
my visitorslistactivity is:
public class visitorslistactivity extends appcompatactivity { public listview lstvisitors; static visitorslist visitorslist; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.visitor_list); try { //********************************** comelete section ********************************************* new jsonhelper.getjsondata(new jsonhelper.getjsondata.asyncresponse() { @override public void processfinish(string output) { try { if (output == null) output = ""; if (output.equals("")) { toast.maketext(getapplicationcontext(), "no visitor founded", toast.length_long) .show(); return; } //960105-------------------- else if (output.equals("401")) { toast.maketext(getapplicationcontext(), "error 401", toast.length_long) .show(); return; } //-------------------------------------- log.i("log", "output" + output); gson gson = new gson(); output = output.substring(1, output.length() - 1); /*toast.maketext(getapplicationcontext(), output, toast.length_long) .show();*/ visitorslist = new visitorslist(); visitorslist = gson.fromjson(output, visitorslist.class); } catch (exception e) { e.printstacktrace(); toast.maketext(getapplicationcontext(), "exception", toast.length_long) .show(); } } }).execute("http://192.168.1.162:8014/api/visitors"); //************************************ visitor list null :| ******************************************* /*if( visitorslist == null) { toast.maketext(getapplicationcontext(), "data nul", toast.length_long) .show(); }*/ adaptervisitor customadapter = new adaptervisitor(this, r.layout.visitor_list, visitorslist.visitorslist); customadapter.notifydatasetchanged(); lstvisitors.setadapter(customadapter); lstvisitors.requestfocus(); final viewgroup layoutclear = (viewgroup) findviewbyid(r.id.layoutclear); layoutclear.setvisibility(view.gone); } catch (exception e) { e.getmessage(); } } } and visitorslist:
public class visitorslist { public visitorslist() {} public arraylist<visitors> visitorslist;} visitors:
public class visitors { public string visitorid; public string visitorname; public string visitorphon; public string visitoraddr; public string geocode; public int autokey;} and visitor list created gson null. dont know maybe problem in reading json or maybe visitors class ...
jsonhelper :
public class jsonhelper { public static class getjsondata extends asynctask<string, void, string> { public interface asyncresponse { void processfinish(string output); } public asyncresponse delegate = null; public getjsondata(asyncresponse delegate) { this.delegate = delegate; } @override protected string doinbackground(string... strurl) { string str = strurl[0]; urlconnection urlconn = null; bufferedreader bufferedreader = null; try { url url = new url(str); urlconn = url.openconnection(); urlconn.setreadtimeout(300000); urlconn.setconnecttimeout(5000); bufferedreader = new bufferedreader(new inputstreamreader(urlconn.getinputstream(), "utf-8"), 8); stringbuffer stringbuffer = new stringbuffer(); string line; while ((line = bufferedreader.readline()) != null) { stringbuffer.append(line); } string tmpjson = stringbuffer.tostring().replace("\\", ""); return tmpjson; } catch (exception ex) { ex.getmessage(); return null; } { if (bufferedreader != null) { try { bufferedreader.close(); } catch (ioexception e) { e.printstacktrace(); } } } } @override protected void onpostexecute(string response) { delegate.processfinish(response); } } public static class setjsondata extends asynctask<string, void, string> { string responseserver; public interface asyncresponse { void processfinish(string output); } public asyncresponse delegate = null; public setjsondata(asyncresponse delegate) { this.delegate = delegate; } @override protected string doinbackground(string... param) { url url; string response = null; try { url = new url(param[0]); httpurlconnection conn = null; conn = (httpurlconnection) url.openconnection(); conn.setreadtimeout(20000); conn.setconnecttimeout(10000);//950718 conn.setrequestmethod("get"); conn.setdoinput(true); conn.setdooutput(true); outputstream os = conn.getoutputstream(); bufferedwriter writer = new bufferedwriter(new outputstreamwriter(os, "utf-8")); writer.write(param[1]); writer.flush(); writer.close(); os.close(); int responsecode = conn.getresponsecode(); if (responsecode == httpsurlconnection.http_ok) { string line; bufferedreader br = new bufferedreader(new inputstreamreader(conn.getinputstream())); while ((line = br.readline()) != null) { response += line; } } else { response = (string.valueof(responsecode)); string line; bufferedreader br = new bufferedreader(new inputstreamreader(conn.geterrorstream()));//950427 while ((line = br.readline()) != null) { } } return response; } catch (ioexception e1) { e1.getmessage(); return null; } catch (exception e) { e.getmessage(); return null; } } @override protected void onpostexecute(string result) { // todo auto-generated method stub try { super.onpostexecute(result); delegate.processfinish(result); } catch (exception e) { e.getmessage(); } } }}
your visitors class missing annotations. use convert properly: http://www.jsonschema2pojo.org/
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