Roboto Font Variant in XML

misc.xml

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>