How to display date picker dialog box extends from linear layout view in android -

i making custom view extend linear layout. here want display date picker when click getdate button. how this?

 public class xmltest extends linearlayout implements onitemselectedlistener, ondatesetlistener{       date = calendar.getinstance();                             btndate.setonclicklistener(new button.onclicklistener() {                                  @override                                 public void onclick(view v) {                                     datepickerinput=v.getid();                                     (int d = 0; d < mlistdatetimebutton.size(); d++){                                         if (listdatetimebutton.get(d).getid() == v.getid()){                                               showdatedialog(etlocationtest, date);                                         }                                     }                                 }                             });  }  protected void showdatedialog(edittext etlocationtest2, calendar date2) {         log.i("", "date showdatedialog ");         activedatedisplay = etlocationtest2;         activedate = date2;             ((activity) getcontext()).showdialog(date_dialog_id);       } 

but not display date picker dialog box. how this.

inside oncreateview. btndate.setonclicklistener(new view.onclicklistener() {

        public void onclick(view v) {             datepickerdialog dialog = new datepickerdialog(getactivity(),datepickerlistener,                     year, mon,day);             dialog.show();       } }); 

private datepickerdialog.ondatesetlistener datepickerlistener = new datepickerdialog.ondatesetlistener() {

    public void ondateset(datepicker view, int selectedyear,                           int selectedmonth, int selectedday) {          //do whatever want selectedday,selectedmonth , selectedyear     } };