上个月带有 DatePicker 的日历总是 returns，即使我添加 + 1

Question

我试图从 Calendar 对象获取 Year-Month-Day，我知道月份从索引 0 开始。所以我向 month 对象添加了 +1。但它仍然给了我从选择器到日期选择器的最后一个月。

我哪里错了？

这就是我正在尝试的方式。

这是我的fragmentActivity

public class MyDatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        final Calendar calendar = Calendar.getInstance();
        int day = calendar.get(Calendar.DAY_OF_MONTH);
        int month = calendar.get(Calendar.MONTH) + 1;
        int year = calendar.get(Calendar.YEAR);
        DatePickerDialog myDatePicker =
                new DatePickerDialog(getActivity(), this, year, month, day);
        return myDatePicker;
    }

    @Override
    public void onDateSet(DatePicker datePicker, int year, int month, int day) {
        EditText et = (EditText) getActivity().findViewById(R.id.editTextDate1);
        et.setText(year+"-"+month+"-"+day);
    }

}

这是我的 MainActivity

EditText ed2;
ed2 = (EditText) findViewById(R.id.editTextDate2);
ed2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                DialogFragment myDatePickerFragment = new MyDatePickerFragmentTo();
                myDatePickerFragment.show(getSupportFragmentManager(),"datePicker");
            }
        });

Answer 1

如 documentation:

中所述，

onDateSet() 以从零开始的月份调用

monthOfYear The month that was set (0-11) for compatibility with Calendar.

你也需要调整那里的月份值。

上个月带有 DatePicker 的日历总是 returns，即使我添加 + 1

Calendar with DatePicker always returns last month even if I add + 1

java

android

calendar

datepicker