How to change fontFamily of TextView in Android

itemprop="text">

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.

            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!

class="post-text" itemprop="text">

class="normal">Answer

From
android 4.1 / 4.2 / 5.0, the following href="https://material.google.com/resources/roboto-noto-fonts.html"
rel="noreferrer">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)

href="https://i.stack.imgur.com/M2yxI.png" rel="noreferrer"> src="https://i.stack.imgur.com/M2yxI.png" alt="enter image description
here">

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

            version="1.0" encoding="utf-8"?>

             name="font_family_light">sans-serif-light
             name="font_family_medium">sans-serif-medium
             name="font_family_regular">sans-serif
             name="font_family_condensed">sans-serif-condensed

            sans-serif-black

                        name="font_family_thin">sans-serif-thin