EditText et = new EditText(this, null, Resource.Style.CodeFont);

<resources>
      <style name="CodeFont" parent="@android:style/TextAppearance.Medium">
        <item name="android:layout_width">fill_parent</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:textColor">#FF0000</item>
        <item name="android:typeface">monospace</item>
      </style>
    </resources>

style="@style/CodeFont"

<style name="CodeFont" parent="@android:style/Widget.EditText">
    <item name="android:layout_width">fill_parent</item>
    <item name="android:layout_height">wrap_content</item>
    <item name="android:textColor">#FF0000</item>
    <item name="android:textAppearance">@android:style/TextAppearance.Medium</item>
    <item name="android:typeface">monospace</item>
</style>