How to change fontFamily of TextView in Android

Question

So I'd like to change the android:fontFamily in Android but I don't see any pre-defined fonts in Android. How do I select one of the pre-defined ones? I don't really need to define my own TypeFace but all I need is something different from what it shows right now.

<TextView
    android:id="@+id/HeaderText"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="52dp"
    android:gravity="center"
    android:text="CallerBlocker"
    android:textSize="40dp"
    android:fontFamily="Arial"
 />

It seems what I did up there won't really work! BTW android:fontFamily="Arial" was a stupid attempt!

Answer 1

From android 4.1 / 4.2 / 5.0, the following Roboto font families are available:

android:fontFamily="sans-serif"           // roboto regular
android:fontFamily="sans-serif-light"     // roboto light
android:fontFamily="sans-serif-condensed" // roboto condensed
android:fontFamily="sans-serif-black"     // roboto black
android:fontFamily="sans-serif-thin"      // roboto thin (android 4.2)
android:fontFamily="sans-serif-medium"    // roboto medium (android 5.0)

in combination with

android:textStyle="normal|bold|italic"

this 16 variants are possible:

• Roboto regular
• Roboto italic
• Roboto bold
• Roboto bold italic
• Roboto-Light
• Roboto-Light italic
• Roboto-Thin
• Roboto-Thin italic
• Roboto-Condensed
• Roboto-Condensed italic
• Roboto-Condensed bold
• Roboto-Condensed bold italic
• Roboto-Black
• Roboto-Black italic
• Roboto-Medium
• Roboto-Medium italic

fonts.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="font_family_light">sans-serif-light</string>
    <string name="font_family_medium">sans-serif-medium</string>
    <string name="font_family_regular">sans-serif</string>
    <string name="font_family_condensed">sans-serif-condensed</string>
    <string name="font_family_black">sans-serif-black</string>
    <string name="font_family_thin">sans-serif-thin</string>
</resources>