How to set default display as year wise in Android Dialog datepicker

you can use Calendar and subtract years you want , for example:

public Dialog onCreateDialog(Bundle saveInstanceState)
{
    final Calendar c = Calendar.getInstance();
    c.add(Calendar.YEAR, -18);
    int year = c.get(Calendar.YEAR);
    int month = c.get(Calendar.MONTH);
    int day = c.get(Calendar.DAY_OF_MONTH);

    return new DatePickerDialog(getActivity(), this, year, month, day);
}