android - Can't get the hour and minute from TimePicker -

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i take time gui control 'timepicker' , try set time on object type 'calendar' intent ( used serializable ).

on method 'public void donebtnclickevent(view view) ' exception on line '_calendar.set(calendar.hour, _timepicker.gethour());'

i don't understand did wrong , how solve problem. 

public class settimeactivicy extends appcompatactivity {  private timepicker  _timepicker;   @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_set_time_activicy);      _timepicker = (timepicker)findviewbyid(r.id.timepicker);      _timepicker.setis24hourview(true);  }  public void donebtnclickevent(view view) {      try {          // exception !! => cant take hour , min         int h = _timepicker.gethour();         int m = _timepicker.getminute();      }     catch(exception e)     {         log.e("exception - error ", e.getmessage());     }    }

}

solved ... use 

 int hour = _timepicker.getcurrenthour();  int minute = _timepicker.getcurrentminute();

the method 

int h = _timepicker.gethour(); int m = _timepicker.getminute();

are not working


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