年月日

Calendar calendar = Calendar.getInstance();
        DatePickerDialog dialog = new DatePickerDialog(this,
                DatePickerDialog.THEME_TRADITIONAL,
                new DatePickerDialog.OnDateSetListener() {
                    @Override
                    public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {

                        toash(year + "" + month + dayOfMonth);
                    }
                },
                calendar.get(Calendar.YEAR),
                calendar.get(Calendar.MONTH),
                calendar.get(Calendar.DAY_OF_MONTH));
        dialog.show();

时间

Calendar calendar = Calendar.getInstance();
        TimePickerDialog timePickerDialog = new TimePickerDialog(SelectTimeActivity.this,
                3, new TimePickerDialog.OnTimeSetListener() {
            @Override
            public void onTimeSet(TimePicker view, int hourOfDay, int minute) {

                hour = String.valueOf(hourOfDay);
                min = String.valueOf(minute);
                time.setText(hour + ":" + min);

            }
        }, calendar.get(Calendar.HOUR_OF_DAY)
                , calendar.get(Calendar.MONTH)
                , true);

        timePickerDialog.show();