Android : Get date from DatePicker in another xml file on Android

I want to get date (Day,Month,Year) from DatePicker in another xml file. But app errors NullPointerException without use theInflatedView. If I use theInflatedView, doesn't get date. How I get date from DatePicker in another xml file?

View theInflatedView = getLayoutInflater().inflate(R.layout.dateset, null);
final DatePicker dpFirst = (DatePicker) theInflatedView.findViewById(R.id.datePicker1);

dpFirst.init(dpFirst.getYear(), dpFirst.getMonth(), dpFirst.getDayOfMonth(),new OnDateChangedListener() {

             @Override
             public void onDateChanged(DatePicker arg0, int arg1, int arg2, int arg3) {
             Log.i("date",arg3+ "."+ (arg2+1) + "."+arg1);//There isn't output when date changed
             }
             } );
Log.i("date2",dpFirst.getDayOfMonth()+"."+dpFirst.getMonth()+"."+dpFirst.getYear());//Output-->1.1.2015--(current date)---