如何在ListPreference中改变AlertDialog的文字大小？

例1：

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protected void onPrepareDialogBuilder(AlertDialog.Builder builder) {             builder = new AlertDialog.Builder(new ContextThemeWrapper(this.getContext(), R.style.ListDlgTheme));     super.onPrepareDialogBuilder(builder); }

例2：

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public class ListPreferenceEx extends ListPreference {        Context context1;     View menuView;     public ListPreferenceEx(Context context, AttributeSet attrs)     {         super(context, attrs);         context1=context;     }       @Override     protected void onPrepareDialogBuilder(AlertDialog.Builder builder)     {                //Builder builder1=new AlertDialog.Builder(new ContextThemeWrapper(context1, R.style.AlertDialogCustom));         //super.onPrepareDialogBuilder(builder); // To change body of overridden                                                 // methods use File | Settings |                                                 // File Templates.         //builder=new AlertDialog.Builder(new ContextThemeWrapper(context1, R.style.AlertDialogCustom));         menuView = View.inflate(context1, R.layout.add_tab, null);         /*builder.setNegativeButton(null, null);         builder.setTitle(null);*/         builder.setView(menuView);                                   } }