Android DatePicker片段返回前一个月的日期

问题描述

好吧，这是奇怪的。我有一个非常简单的 DatePicker 对话框。问题是，无论我选择什么日期，回来的价值就是所选日期前一个月。这是我的代码：

ACTIVITY

  btnEventDate.setOnClickListener（new View.OnClickListener（）{
 @Override 
 public void onClick（View v）{
 DialogFragment newFragment = new DatePickerFragment（）; 
 newFragment.show （getSupportFragmentManager（），datePicker）; 
} 
}）; 
 
 @Override 
 public void onDateSet（DatePicker view，int year，int monthOfYear，int dayOfMonth）{
 DateTime dt = new DateTime（year，monthOfYear，dayOfMonth，0，0 ，0,0）; 
 Log.d（Constants.TAG，dt：+ dt.toString（））; 
 Log.d（Constants.TAG，str：+ dateHandler.convertDateToYYYY_MM_DDString（dt））; 
} 
  

DatePickerFragment

  public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {
 
 @Override 
 public Dialog onCreateDialog（Bundle savedInstanceState）{
 //使用当前日期作为选择器中的默认日期
 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）; 
 
返回新的DatePickerDialog（getActivity（），（OnDateSetListener）getActivity（），年，月，日）; 
} 
 
 public void onDateSet（DatePicker view，int year，int month，int day）{} 
} 
  

出现对话框时，显然设置为今天的日期。说我选择2015年10月12日，日志输出显示：

我一定缺少一些东西。任何人都知道我在做错什么？

解决方案

月份从 0 到 12 。从 January 到 Undecimber 。

尝试将它们与日历。MONTH。

示例： Calendar.OCTOBER == 9

链接：。

注意：如果您使用 GregorianCalendar ，您可以忽略第十三个月。

OK, this is bizarre. I have a DatePicker dialog that is really simple. The problem is that no matter what date I choose, the value that comes back is exactly one month prior to the date selected. Here is my code:

ACTIVITY

btnEventDate.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        DialogFragment newFragment = new DatePickerFragment();
        newFragment.show(getSupportFragmentManager(), "datePicker");
    }
});

@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
    DateTime dt = new DateTime(year, monthOfYear, dayOfMonth, 0, 0, 0, 0);
    Log.d(Constants.TAG, "dt: " + dt.toString());
    Log.d(Constants.TAG, "str: " + dateHandler.convertDateToYYYY_MM_DDString(dt));
}

DatePickerFragment

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);

        return new DatePickerDialog(getActivity(), (OnDateSetListener)getActivity(), year, month, day);
    }

    public void onDateSet(DatePicker view, int year, int month, int day) {}
}

When the dialog appears, it is clearly set to today's date. Say that I select October 12, 2015, the log output shows this:

I must be missing something. Anyone know what I'm doing wrong?

解决方案

Months go from 0 to 12. From January to Undecimber.

Try comparing them against Calendar."MONTH".

Example: Calendar.OCTOBER == 9

Link: http://developer.android.com/reference/java/util/Calendar.html#MONTH.

Note: In case you use GregorianCalendar, you can ignore the thirteenth month.

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