Default fonts in Android

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"
    android:background="#424242">
  </TextView>
  <TextView android:layout_height="wrap_content"
    android:typeface="sans"
    android:id="@+id/sansTxt"
    android:layout_width="fill_parent"
    android:text="sans: The quick brown fox
    jumps over the lazy dog">
  </TextView>
  <TextView android:layout_height="wrap_content"
    android:typeface="serif"
    android:layout_width="fill_parent"
    android:text="serif: The quick brown fox
    jumps over the lazy dog"
    android:id="@+id/serifTxt"
    android:background="#424242">
  </TextView>
</LinearLayout>


Quick Explanation
Changing the font on xml is just one attribute and that is android:typeface. Any view/components that extends TextView would instantly have a typeface attribute.

Here is how you can set this as your layout in your java code