There are 3 default fonts in android, there are monospace, sans and serif, here is a xml and the screen cap of those fonts.
<?xml version=”1.0″ encoding=”utf-8″?>
<LinearLayout
xmlns:android=”http://schemas.android.com/apk/res/android”
android:orientation=”vertical”
android:layout_width=”fill_parent”
android:layout_height=”fill_parent” >
<TextView android:layout_height=”wrap_content”
android:typeface=”monospace”
android:id=”@+id/monospaceTxt”
android:layout_width=”fill_parent”
android:text=”Monospace: The quick brown
fox jumps over the lazy dog” [...]