android - DateFormat 产生错误的年份

Question

上图是日期选择器，我点击确定后，结果如下图所示。

代码如下

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) {
    // Do something with the date chosen by the user
    Date date = new Date(year, month, day);
    Fragment fragment = getActivity().getFragmentManager().findFragmentByTag(ConvocationAddDialogFragment.class.getName());
    TextView textView = (TextView) fragment.getView().findViewById(R.id.open_registration_date);
    textView.setText(DateFormat.getDateInstance().format(date));
}
}

期望值是18 Jan 2016，为什么显示18 Jan 3916？

Answer 1

根据源代码new Date(year, month, day);

public Date(int year, int month, int day) {
    GregorianCalendar cal = new GregorianCalendar(false);
    cal.set(1900 + year, month, day);
    milliseconds = cal.getTimeInMillis();
}

在这里，您的年份 2016 将添加到 1900，结果为 3916。

尝试，

Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.YEAR, year);
calendar.set(Calendar.MONTH, month);
calendar.set(Calendar.DAY_OF_MONTH, day);
Date date = calendar.getTime();