android - Awesome Errors with date wheel picker? -


i have problem date wheel picker. has change date specific month. in 30, february doesn't have 28 days. in 31, months change 31. days, works pretty well.(eg. in emulator date 1-2-2014, work yesterday, emulator date 31-1-2014, months 31.) , problem, in jun 30, february doesn't have 28.what should do, give me advices. 

    package com.example.aa;  import java.util.arraylist; import java.util.calendar; import java.util.list;  import android.app.dialog; import android.content.context; import android.graphics.typeface; import android.util.log; import android.view.view; import android.view.viewgroup; import android.view.window; import android.widget.button; import android.widget.linearlayout; import android.widget.tablelayout.layoutparams; import android.widget.textview; import kankan.wheel.widget.adapters.arraywheeladapter; import kankan.wheel.widget.adapters.numericwheeladapter; import kankan.wheel.widget.onwheelchangedlistener; import kankan.wheel.widget.wheelview;  public class datepickerdailog extends dialog {      private context mcontex;      private int noofyear = 113;      public datepickerdailog(context context, calendar calendar,             final datepickerlistner dtp) {          super(context);         mcontex = context;         linearlayout lytmain = new linearlayout(mcontex);         lytmain.setorientation(linearlayout.vertical);         linearlayout lytdate = new linearlayout(mcontex);         linearlayout lytbutton = new linearlayout(mcontex);          button btnset = new button(mcontex);         button btncancel = new button(mcontex);          btnset.settext("set");         btncancel.settext("cancel");          final wheelview month = new wheelview(mcontex);         month.setminimumheight(300);         final wheelview year = new wheelview(mcontex);         year.setminimumheight(300);         final wheelview day = new wheelview(mcontex);         day.setminimumheight(300);          lytdate.addview(day, new layoutparams(                 android.view.viewgroup.layoutparams.wrap_content,                 android.view.viewgroup.layoutparams.wrap_content, 1.2f));         lytdate.addview(month, new layoutparams(                 android.view.viewgroup.layoutparams.wrap_content,                 android.view.viewgroup.layoutparams.wrap_content, 0.8f));         lytdate.addview(year, new layoutparams(                 android.view.viewgroup.layoutparams.wrap_content,                 android.view.viewgroup.layoutparams.wrap_content, 1f));         requestwindowfeature(window.feature_no_title);          lytbutton.addview(btnset, new layoutparams(                 android.view.viewgroup.layoutparams.fill_parent,                 android.view.viewgroup.layoutparams.wrap_content, 1f));          lytmain.addview(lytbutton);         lytmain.addview(lytdate);          setcontentview(lytmain);          getwindow().setlayout(layoutparams.fill_parent,                 layoutparams.wrap_content);         getwindow().setbackgrounddrawableresource(android.r.color.white);          onwheelchangedlistener listener = new onwheelchangedlistener() {             public void onchanged(wheelview wheel, int oldvalue, int newvalue) {                  updatedays(year, month, day);              }         };          // month         int curmonth = calendar.get(calendar.month);         log.i("curmonth",curmonth+"");         string months[] = new string[] { "january", "february", "march",                 "april", "may", "june", "july", "august", "september",                 "october", "november", "december" };         month.setviewadapter(new datearrayadapter(context, months, curmonth));         month.setcurrentitem(curmonth);         month.addchanginglistener(listener);          calendar cal = calendar.getinstance();          // year         int curyear = calendar.get(calendar.year);         log.i("curyear", curyear+"");         int year = cal.get(calendar.year);          arraylist<integer> yearlist = new arraylist<integer>();         int [] yeararray=null;          for(int = 1900 ; <= curyear ; i++){             yearlist.add(i);         }         yeararray = new int[yearlist.size()];          for(int = 0 ; < yeararray.length ;i++){             yeararray[i] = yearlist.get(i);         }          year.setviewadapter(new datenumericadapter(context,1900,curyear, curyear));         year.setcurrentitem(curyear-1900);         year.addchanginglistener(listener);         // day         updatedays(year, month, day);         day.setcurrentitem(calendar.get(calendar.day_of_month) - 1);         log.i("calendar.get(calendar.day_of_month) - 1",calendar.get(calendar.day_of_month) - 1+"");         btnset.setonclicklistener(new view.onclicklistener() {              @override             public void onclick(view v) {                 // todo auto-generated method stub                 calendar c = updatedays(year, month, day);                 dtp.ondonebutton(datepickerdailog.this, c);             }         });         btncancel.setonclicklistener(new view.onclicklistener() {              @override             public void onclick(view v) {                 dtp.oncancelbutton(datepickerdailog.this);              }         });     }          calendar updatedays(wheelview year, wheelview month, wheelview day) {              calendar calendar = calendar.getinstance();              calendar.set(calendar.year,1900+year.getcurrentitem());              calendar.set(calendar.month, month.getcurrentitem());              log.i("month.getcurrentitem()",month.getcurrentitem()+"");              int maxdays = calendar.getactualmaximum(calendar.day_of_month);             log.i("maxdays",maxdays+"");             day.setviewadapter(new datenumericadapter(mcontex, 1, maxdays, calendar.get(calendar.day_of_month) - 1));              int curday = math.min(maxdays, day.getcurrentitem() + 1);              day.setcurrentitem(curday - 1, true);             calendar.set(calendar.day_of_month, curday);             //calendar.set(calendar.day_of_month, day.getcurrentitem()+1);             log.i("calendar",calendar+"");              long millicalendar = calendar.gettimeinmillis();             calendar currentcalendar = calendar.getinstance();             long millicurrentcalendar = currentcalendar.gettimeinmillis();              if( millicalendar > millicurrentcalendar){                 return currentcalendar;             }             else{                 return calendar;             }     }        private class datenumericadapter extends numericwheeladapter {         int currentitem;         int currentvalue;          public datenumericadapter(context context, int minvalue, int maxvalue,                 int current) {             super(context, minvalue, maxvalue);             this.currentvalue = current;             settextsize(20);         }          @override         protected void configuretextview(textview view) {             super.configuretextview(view);              view.settypeface(null, typeface.bold);         }          @override         public view getitem(int index, view cachedview, viewgroup parent) {             currentitem = index;             return super.getitem(index, cachedview, parent);         }     }      private class datearrayadapter extends arraywheeladapter<string> {         int currentitem;         int currentvalue;          public datearrayadapter(context context, string[] items, int current) {             super(context, items);             this.currentvalue = current;             settextsize(23);         }          @override         protected void configuretextview(textview view) {             super.configuretextview(view);             if (currentitem == currentvalue) {              }             view.settypeface(null, typeface.bold);         }          @override         public view getitem(int index, view cachedview, viewgroup parent) {             currentitem = index;             return super.getitem(index, cachedview, parent);         }     }      public interface datepickerlistner {         public void ondonebutton(dialog datedialog, calendar c);          public void oncancelbutton(dialog datedialog);     } }

the culprit here 

calendar cal = calendar.getinstance();

i fixed issue using joda time instead of standard java.util.calendar/date 

gregorianchronology calendar = gregorianchronology.getinstance(); datetimefield field = calendar.dayofmonth(); localdate date = new localdate(myear, mmonth+1, 1, calendar); int max = field.getmaximumvalue(date);

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