我尝试了一些来自How to change DatePicker dialog color for Android 5.0的建议，但唯一的问题是接下来的两个按钮在编写代码后不可见

public static void showExpenseDate(final Context context, final EditText textView) {

        final Calendar calendar = Calendar.getInstance();
        int yy = calendar.get(Calendar.YEAR);
        int mm = calendar.get(Calendar.MONTH);
        int dd = calendar.get(Calendar.DAY_OF_MONTH);
        DatePickerDialog datePicker = new DatePickerDialog(context, R.style.DialogTheme, new DatePickerDialog.OnDateSetListener() {
            @Override
            public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                //String[] mons = new DateFormatSymbols(Locale.ENGLISH).getShortMonths();
                //String mName = mons[monthOfYear];
                expense_date = String.valueOf(year) + "-" + String.valueOf((monthOfYear + 1))
                        + "-" + String.valueOf(dayOfMonth);
                textView.setText(expense_date);
                Log.d("djkjiksd", expense_date);

            }
        }, yy, mm, dd);

        datePicker.show();
    }

在theme.xml中

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

但是按钮的颜色没有出现在UI上。2根据应用程序实现日期选择器主题的解决方案和正确的方法是什么？