android - 检查 onDateSet 中选定日期的条件

Question

我有一个 android 应用程序 - 在其中一项活动中，我提出了一个 DatePickerDialog.OnDateSetListener 供用户选择日期。

例如，我想确保用户选择的日期是工作日是星期三。 我的问题是如何检查所选日期的某些条件 - 如有必要，请发布“请选择另一个日期”消息并允许用户再次选择。

这里是代码， 所有这些代码都在 OnCreate 方法上

mCalendar = Calendar.getInstance();
        DatePickerDialog.OnDateSetListener date = new DatePickerDialog.OnDateSetListener() {

            @Override
            public void onDateSet(DatePicker view, int year, int monthOfYear,
                    int dayOfMonth) {
                // Here I want to check if the date is good. 
                // if its good - call GetPlayersList()
                // if not - raise a message and let user choose again
                mCalendar.set(Calendar.YEAR, year);
                mCalendar.set(Calendar.MONTH, monthOfYear);
                mCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
                new GetPlayersList().execute(Utilities
                        .getAccessToken(AttendanceActivity.this));
            }

        };

        new DatePickerDialog(AttendanceActivity.this, date,
                mCalendar.get(Calendar.YEAR), mCalendar.get(Calendar.MONTH),
                mCalendar.get(Calendar.DAY_OF_MONTH)).show();

有什么想法吗？在此先感谢

Answer 1

你可以使用mCalendar.get(Calendar.DAY_OF_WEEK):

int dayOfWeek = mCalendar.get(Calendar.DAY_OF_WEEK);

if(dayOfWeek == Calendar.WEDNESDAY) {
    // it is a Wednesday
} else {
    // it is not a Wednesday
}

编辑

看起来像这样：

private void showDialog() {
    final Calendar calendar = Calendar.getInstance();

    new DatePickerDialog(AttendanceActivity.this, new DatePickerDialog.OnDateSetListener() {
        @Override
        public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
            calendar.set(Calendar.YEAR, year);
            calendar.set(Calendar.MONTH, monthOfYear);
            calendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);

            int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);

            if(dayOfWeek == Calendar.WEDNESDAY) {
                // it is a Wednesday - do what you want
                new GetPlayersList().execute(Utilities.getAccessToken(AttendanceActivity.this));
            } else {
                // it is not a Wednesday - show the dialog again
                showDialog();
            }
        }
    },
            calendar.get(Calendar.YEAR),
            calendar.get(Calendar.MONTH),
            calendar.get(Calendar.DAY_OF_MONTH)).show();
}