DatePicker onDateChanged调用了两次

Question

我在DatePicker内Fragment内有ViewPager。

evertime我做了一个改变，我看到事件发生了两次。

这是常见的吗？

这是我的代码：

public class CreateWishFormDatePaginationFragment extends Fragment implements DatePicker.OnDateChangedListener {


    public static CreateWishFormDatePaginationFragment newInstance(int position) {
        Log.i("PaginationFragment#", " CreateWishFormDatePaginationFragment called for fragment : " + position);
        CreateWishFormDatePaginationFragment fragment = new CreateWishFormDatePaginationFragment();
        Bundle args = new Bundle();
        args.putInt(KEY_POSITION, position);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        // ... (omitted)
        dateDeparture.init(dateDepartureInit.get(Calendar.YEAR), dateDepartureInit.get(Calendar.MONTH), dateDepartureInit.get(Calendar.DATE), this);
    }



    @Override
        public void onDateChanged(DatePicker datePicker, int i, int i2, int i3) {

            if (datePicker.isShown()) {
                Calendar c = Calendar.getInstance();
                c.set(i, i2, i3);
                Log.d("PaginationFragment#", "onDateChanged: " + c.get(Calendar.YEAR));
                listener.onFormDateEvent(CriterionName.DATE_DEPARTURE, c, iPosition);
                txtDepartureWeekday.setText(c.getDisplayName(Calendar.DAY_OF_WEEK, Calendar.LONG, Locale.ENGLISH));
            }
        }
}

日志：

03-04 15:13:01.238  28352-28352/org.intracode.shoppingalertsystem.app D/PaginationFragment#﹕ onDateChanged: 2016
...
03-04 15:13:01.241  28352-28352/org.intracode.shoppingalertsystem.app D/PaginationFragment#﹕ onDateChanged: 2016

任何其他控件都不会发射两次。