android AlertDialog style

ContextThemeWrapper ctw = new ContextThemeWrapper( this, R.style.AlertDialogCustom);
AlertDialog.Builder builder= new AlertDialog.Builder( ctw );

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="AlertDialogCustom" parent="@android:style/AlertDialog">
        <item name="android:textColor">#00FF00</item>
        <item name="android:typeface">monospace</item>
        <item name="android:textSize">10sp</item>
    </style>
</resources>