java - How to set a minimum date -

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i have 2 buttons. first button - depart , second - arrival. @ date of departure mindate = today. , arrival date mindate should equal selected date of departure

oncreate(): 

final calendar nextyear = calendar.getinstance(); nextyear.add(calendar.year, 1);  date today = new date(); date departs;  initbuttonlisteners(today, nextyear);

buttonclicklistener:

public void initbuttonlisteners(final date today, final calendar nextyear) {     findviewbyid(id.linearcalendar).setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {             showcalendarindialog("select departure date", r.layout.calendar_dialog_customized);                  dialogview.init(today, nextyear.gettime())                         .withselecteddate(new date(departdata));          }     });      findviewbyid(id.lineararrive).setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {             showcalendarindialog("select arrival date", r.layout.calendar_dialog_customized);              date dates = null;                  simpledateformat format = new simpledateformat("dd mmm yyyy");                 try {                     dates = format.parse(departdata);                 } catch (parseexception e) {                     e.printstacktrace();                 }                 dialogview.init(dates, nextyear.gettime())                         .withselecteddate(new date(arrivedata));             }          }     });  }

ondateclicklistener:

dialogview.setondateselectedlistener(new calendarpickerview.ondateselectedlistener() {         dateformat dateformat = new simpledateformat("dd mmm yyyy");          @override         public void ondateselected(date date) {             if(isfrom){                 departdata = dateformat.format(date);                 tvdepart.settext(departdata);             }else{                 arrivedata = dateformat.format(date);                 tvarrive.settext(arrivedata);             }              thedialog.dismiss();          }          @override         public void ondateunselected(date date) {          }      });

when click on arrival button crashes app shows value zero

error:

java.lang.illegalargumentexception: string argument null  @ java.util.date.parse(date.java:373)  @ java.util.date.<init>(date.java:149)  @ com.tezz.maincontent.contentactivity$2.onclick(contentactivity.java:305)  @ android.view.view.performclick(view.java:4084)  @ android.view.view$performclick.run(view.java:16966)  @ android.os.handler.handlecallback(handler.java:615)  @ android.os.handler.dispatchmessage(handler.java:92)  @ android.os.looper.loop(looper.java:137)  @ android.app.activitythread.main(activitythread.java:4745)  @ java.lang.reflect.method.invokenative(native method)  @ java.lang.reflect.method.invoke(method.java:511)  @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:786)  @ com.android.internal.os.zygoteinit.main(zygoteinit.java:553)  @ dalvik.system.nativestart.main(native method)

what not right, how put mindate?

try  if (event.value)     {       // convert field value date          var d = util.scand("mmddyyyy", event.value);     // set maximum date          var d_max = new date(2013, 11, 31, 23, 59, 59);     // set minimum date         var d_min = new date(2010, 11, 31, 23, 59, 59);         if (d.gettime()>d_max.gettime() || d.gettime()<d_min.gettime()) {         // reject entry              event.rc = false;               // optionally, alert user                   app.alert("message here.");     } }

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