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.
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

Update History
Jan 17, 2012 - Visual Update
<?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
Update History
Jan 17, 2012 - Visual Update
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