font_aware_textappearancespan__typeface_create.java

// Typeface
public static Typeface create(String familyName, @Style int style) {
    return create(getSystemDefaultTypeface(familyName), style);
}

private static Typeface getSystemDefaultTypeface(@NonNull String familyName) {
    Typeface tf = sSystemFontMap.get(familyName);
    return tf == null ? Typeface.DEFAULT : tf;
}