alertdialog 使用系统选择时改变 默认字体大小

ContextThemeWrapper ctw = new ContextThemeWrapper( getActivity(), R.style.AlertDialogCustom );Builder builder = new AlertDialog.Builder(btw);  <style name="AlertDialogCustom" parent="@android:style/Theme.Dialog">        <item name="android:textSize">15sp</item>    </style>