DatePickerFragment.java

public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current date as the default date in the picker
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        // Create a new instance of DatePickerDialog and return it
        return new DatePickerDialog(getActivity(), this, year, month, day);

    }

    public void onDateSet(DatePicker view, int year, int month, int day) {
        TextView dateView = (TextView) getActivity().findViewById(R.id.date_view);
        Calendar c = Calendar.getInstance();
        c.set(year, month, day);
        DateFormat df = DateFormat.getDateInstance(DateFormat.SHORT, new Locale("pl", "pl"));

        dateView.setText(df.format(c.getTime()));
    }
}