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

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));
}
}

预期值为2016年1月18日，为什么显示3916年1月18日？

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 2016 年将添加到 1900 中，结果为 3916。

试试，

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();

Answer 2

这样使用

public static class DatePickerFragment extends DialogFragment
        implements DatePickerDialog.OnDateSetListener {

    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current date as the default date in the picker
        tv_date= (TextView)getActivity().findViewById(R.id.tv_date);
        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);

        DatePickerDialog dialog = new DatePickerDialog(getActivity(), this, year, month, day);

        dialog.getDatePicker().setMinDate(c.getTimeInMillis());


        return dialog;
    }

    public void onDateSet(DatePicker view, int year, int month, int day) {
        // Do something with the date chosen by the user
        tv_date.setText(new StringBuilder().append(day).append("-")
                .append(month+1).append("-").append(year));
        date=tv_date.getText().toString();
    }
}

DateFormat 产生错误的年份

DateFormat produce wrong year

android

android-datepicker

android-date