Question

我正在尝试从datepicker获取所选日期，但我无法获得正确的值。我的代码如下。

View mView = getLayoutInflater().inflate(R.layout.set_date_layout, null);

    dialog = new MaterialDialog.Builder(RemainderActivity.this);
    dialog.title(R.string.set_date);

    datePicker = (DatePicker) mView.findViewById(R.id.datePickerRemainder);


    dialog.customView(mView, true);
    dialog.positiveText(R.string.confirm_date);
    dialog.negativeText(android.R.string.cancel);
    dialog.cancelable(false);
    dialog.onPositive(new MaterialDialog.SingleButtonCallback() {
        @Override
        public void onClick(@NonNull MaterialDialog dialog, @NonNull DialogAction which) {

            DateFormat df = new SimpleDateFormat("dd-MM-yyyy");
            Log.d("YEAR", datePicker.getYear()+""); //Shows correct year as 2017
            Date date = new Date(datePicker.getDayOfMonth(), (datePicker.getMonth() + 1),datePicker.getYear()); // Wrong date as 09-04-1907
            String dateString = df.format(date);
            txt_remainder_date_add.setText(dateString);
        }
    });
    dialog.build();
    dialog.show();

Answer 1

  private void datepicker() {
    // Get Current Date
    final Calendar c = Calendar.getInstance();
    int mYear = c.get(Calendar.YEAR);
    int mMonth = c.get(Calendar.MONTH);
    int mDay = c.get(Calendar.DAY_OF_MONTH);

    DatePickerDialog datePickerDialog = new DatePickerDialog(this, R.style.DialogTheme,
            new DatePickerDialog.OnDateSetListener() {

                @Override
                public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {

                    date_time = dayOfMonth + "-" + (monthOfYear + 1) + "-" + year;
txt_remainder_date_add.setText(date_time);
                }
            }, mYear, mMonth, mDay);
    datePickerDialog.show();
}

我的DialogTheme风格定义：

 <style name="DialogTheme" parent="Theme.AppCompat.Light.Dialog">
    <item name="colorAccent">@color/colorPrimary</item>
</style>

在您想要的地方调用此方法

Answer 2

根据此 Link

您在下面的行中使用了弃用的代码：

Date date = new Date(datePicker.getDayOfMonth(), (datePicker.getMonth() + 1),datePicker.getYear());

不要使用日期类，而是尝试日历类对象...

Calendar cal = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
System.out.println(sdf.format(cal.getTime()));

您可以参考此Link例如......

Android DatePicker值显示错误的值

2 个答案: