Here is a simple example in which we will download a font from google and set it to our textview.

Downloadable Fonts Android

View the Demo here

Layout

Here is our layout. The Edittext is a autocomplete textview where we will load the font names to download.
The font names are stored in values.xml

Lets see the layout.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="@dimen/margin_medium"
        android:text="@string/downloadable_font_applied_text"
        android:textSize="20sp" />

    <LinearLayout
        android:id="@+id/family_name_input_area"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="@dimen/margin_large"
        android:layout_marginEnd="@dimen/margin_large"
        android:layout_marginStart="@dimen/margin_large"
        android:layout_marginTop="@dimen/bottom_sheet_top_margin"
        android:orientation="horizontal">

        <android.support.design.widget.TextInputLayout
            android:id="@+id/auto_complete_family_name_input"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="4">

            <AutoCompleteTextView
                android:id="@+id/auto_complete_family_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:completionThreshold="1"
                android:hint="@string/family_name"
                android:singleLine="true" />
        </android.support.design.widget.TextInputLayout>

        <android.support.v4.widget.Space
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1" />

        <Button
            android:id="@+id/button_request"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/request" />
    </LinearLayout>

    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:layout_gravity="top|center_horizontal"
        android:visibility="gone" />
</RelativeLayout>

Font Family names

font_family.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="family_names">
        <item>ABeeZee</item>
        <item>Abel</item>
        <item>Abhaya Libre</item>
        <item>Abril Fatface</item>
        <item>Aclonica</item>
        <item>Acme</item>
        <item>Actor</item>
        <item>Adamina</item>
        <item>Advent Pro</item>
        <item>Aguafina Script</item>
        <item>Akronim</item>
        <item>Aladin</item>
        <item>Aldrich</item>
        <item>Alef</item>
        <item>Alegreya</item>
        <item>Alegreya SC</item>
        <item>Alegreya Sans</item>
        <item>Alegreya Sans SC</item>
        <item>Alex Brush</item>
        <item>Alfa Slab One</item>
        <item>Alice</item>
        <item>Alike</item>
        <item>Alike Angular</item>
        <item>Allan</item>
        <item>Allerta</item>
        <item>Allerta Stencil</item>
        <item>Allura</item>
        <item>Almendra</item>
        <item>Almendra Display</item>
        <item>Almendra SC</item>
        <item>Amarante</item>
        <item>Amaranth</item>
        <item>Amatic SC</item>
        <item>Amatica SC</item>
        <item>Amethysta</item>
        <item>Amiko</item>
        <item>Amiri</item>
        <item>Amita</item>
        <item>Anaheim</item>
        <item>Andada</item>
        <item>Andika</item>
        <item>Angkor</item>
        <item>Annie Use Your Telescope</item>
        <item>Anonymous Pro</item>
        <item>Antic</item>
        <item>Antic Didone</item>
        <item>Antic Slab</item>
        <item>Anton</item>
        <item>Arapey</item>
        <item>Arbutus</item>
        <item>Arbutus Slab</item>
        <item>Architects Daughter</item>
        <item>Archivo Black</item>
        <item>Archivo Narrow</item>
        <item>Aref Ruqaa</item>
        <item>Arima Madurai</item>
        <item>Arimo</item>
        <item>Arizonia</item>
        <item>Armata</item>
        <item>Arsenal</item>
        <item>Artifika</item>
        <item>Arvo</item>
        <item>Arya</item>
        <item>Asap</item>
        <item>Asar</item>
        <item>Asset</item>
        <item>Assistant</item>
        <item>Astloch</item>
        <item>Asul</item>
        <item>Athiti</item>
        <item>Atma</item>
        <item>Atomic Age</item>
        <item>Aubrey</item>
        <item>Audiowide</item>
        <item>Autour One</item>
        <item>Average</item>
        <item>Average Sans</item>
        <item>Averia Gruesa Libre</item>
        <item>Averia Libre</item>
        <item>Averia Sans Libre</item>
        <item>Averia Serif Libre</item>
        <item>Bad Script</item>
        <item>Bahiana</item>
        <item>Baloo</item>
        <item>Baloo Bhai</item>
        <item>Baloo Bhaina</item>
        <item>Baloo Chettan</item>
        <item>Baloo Da</item>
        <item>Baloo Paaji</item>
        <item>Baloo Tamma</item>
        <item>Baloo Thambi</item>
        <item>Balthazar</item>
        <item>Bangers</item>
        <item>Barrio</item>
        <item>Basic</item>
        <item>Battambang</item>
        <item>Baumans</item>
        <item>Bayon</item>
        <item>Belgrano</item>
        <item>Belleza</item>
        <item>BenchNine</item>
        <item>Bentham</item>
        <item>Berkshire Swash</item>
        <item>Bevan</item>
        <item>Bigelow Rules</item>
        <item>Bigshot One</item>
        <item>Bilbo</item>
        <item>Bilbo Swash Caps</item>
        <item>BioRhyme</item>
        <item>BioRhyme Expanded</item>
        <item>Biryani</item>
        <item>Bitter</item>
        <item>Black Ops One</item>
        <item>Bokor</item>
        <item>Bonbon</item>
        <item>Boogaloo</item>
        <item>Bowlby One</item>
        <item>Bowlby One SC</item>
        <item>Brawler</item>
        <item>Bree Serif</item>
        <item>Bubblegum Sans</item>
        <item>Bubbler One</item>
        <item>Buda</item>
        <item>Buenard</item>
        <item>Bungee</item>
        <item>Bungee Hairline</item>
        <item>Bungee Inline</item>
        <item>Bungee Outline</item>
        <item>Bungee Shade</item>
        <item>Butcherman</item>
        <item>Butterfly Kids</item>
        <item>Cabin</item>
        <item>Cabin Condensed</item>
        <item>Cabin Sketch</item>
        <item>Caesar Dressing</item>
        <item>Cagliostro</item>
        <item>Cairo</item>
        <item>Calligraffitti</item>
        <item>Cambay</item>
        <item>Cambo</item>
        <item>Candal</item>
        <item>Cantarell</item>
        <item>Cantata One</item>
        <item>Cantora One</item>
        <item>Capriola</item>
        <item>Cardo</item>
        <item>Carme</item>
        <item>Carrois Gothic</item>
        <item>Carrois Gothic SC</item>
        <item>Carter One</item>
        <item>Catamaran</item>
        <item>Caudex</item>
        <item>Caveat</item>
        <item>Caveat Brush</item>
        <item>Cedarville Cursive</item>
        <item>Ceviche One</item>
        <item>Changa</item>
        <item>Changa One</item>
        <item>Chango</item>
        <item>Chathura</item>
        <item>Chau Philomene One</item>
        <item>Chela One</item>
        <item>Chelsea Market</item>
        <item>Chenla</item>
        <item>Cherry Cream Soda</item>
        <item>Cherry Swash</item>
        <item>Chewy</item>
        <item>Chicle</item>
        <item>Chivo</item>
        <item>Chonburi</item>
        <item>Cinzel</item>
        <item>Cinzel Decorative</item>
        <item>Clicker Script</item>
        <item>Coda</item>
        <item>Coda Caption</item>
        <item>Codystar</item>
        <item>Coiny</item>
        <item>Combo</item>
        <item>Comfortaa</item>
        <item>Coming Soon</item>
        <item>Concert One</item>
        <item>Condiment</item>
        <item>Content</item>
        <item>Contrail One</item>
        <item>Convergence</item>
        <item>Cookie</item>
        <item>Copse</item>
        <item>Corben</item>
        <item>Cormorant</item>
        <item>Cormorant Garamond</item>
        <item>Cormorant Infant</item>
        <item>Cormorant SC</item>
        <item>Cormorant Unicase</item>
        <item>Cormorant Upright</item>
        <item>Courgette</item>
        <item>Cousine</item>
        <item>Coustard</item>
        <item>Covered By Your Grace</item>
        <item>Crafty Girls</item>
        <item>Creepster</item>
        <item>Crete Round</item>
        <item>Crimson Text</item>
        <item>Croissant One</item>
        <item>Crushed</item>
        <item>Cuprum</item>
        <item>Cutive</item>
        <item>Cutive Mono</item>
        <item>Damion</item>
        <item>Dancing Script</item>
        <item>Dangrek</item>
        <item>David Libre</item>
        <item>Dawning of a New Day</item>
        <item>Days One</item>
        <item>Dekko</item>
        <item>Delius</item>
        <item>Delius Swash Caps</item>
        <item>Delius Unicase</item>
        <item>Della Respira</item>
        <item>Denk One</item>
        <item>Devonshire</item>
        <item>Dhurjati</item>
        <item>Didact Gothic</item>
        <item>Diplomata</item>
        <item>Diplomata SC</item>
        <item>Domine</item>
        <item>Donegal One</item>
        <item>Doppio One</item>
        <item>Dorsa</item>
        <item>Dosis</item>
        <item>Dr Sugiyama</item>
        <item>Droid Sans</item>
        <item>Droid Sans Mono</item>
        <item>Droid Serif</item>
        <item>Duru Sans</item>
        <item>Dynalight</item>
        <item>EB Garamond</item>
        <item>Eagle Lake</item>
        <item>Eater</item>
        <item>Economica</item>
        <item>Eczar</item>
        <item>Ek Mukta</item>
        <item>El Messiri</item>
        <item>Electrolize</item>
        <item>Elsie</item>
        <item>Elsie Swash Caps</item>
        <item>Emblema One</item>
        <item>Emilys Candy</item>
        <item>Engagement</item>
        <item>Englebert</item>
        <item>Enriqueta</item>
        <item>Erica One</item>
        <item>Esteban</item>
        <item>Euphoria Script</item>
        <item>Ewert</item>
        <item>Exo</item>
        <item>Exo 2</item>
        <item>Expletus Sans</item>
        <item>Fanwood Text</item>
        <item>Farsan</item>
        <item>Fascinate</item>
        <item>Fascinate Inline</item>
        <item>Faster One</item>
        <item>Fasthand</item>
        <item>Fauna One</item>
        <item>Federant</item>
        <item>Federo</item>
        <item>Felipa</item>
        <item>Fenix</item>
        <item>Finger Paint</item>
        <item>Fira Mono</item>
        <item>Fira Sans</item>
        <item>Fira Sans Condensed</item>
        <item>Fira Sans Extra Condensed</item>
        <item>Fjalla One</item>
        <item>Fjord One</item>
        <item>Flamenco</item>
        <item>Flavors</item>
        <item>Fondamento</item>
        <item>Fontdiner Swanky</item>
        <item>Forum</item>
        <item>Francois One</item>
        <item>Frank Ruhl Libre</item>
        <item>Freckle Face</item>
        <item>Fredericka the Great</item>
        <item>Fredoka One</item>
        <item>Freehand</item>
        <item>Fresca</item>
        <item>Frijole</item>
        <item>Fruktur</item>
        <item>Fugaz One</item>
        <item>GFS Didot</item>
        <item>GFS Neohellenic</item>
        <item>Gabriela</item>
        <item>Gafata</item>
        <item>Galada</item>
        <item>Galdeano</item>
        <item>Galindo</item>
        <item>Gentium Basic</item>
        <item>Gentium Book Basic</item>
        <item>Geo</item>
        <item>Geostar</item>
        <item>Geostar Fill</item>
        <item>Germania One</item>
        <item>Gidugu</item>
        <item>Gilda Display</item>
        <item>Give You Glory</item>
        <item>Glass Antiqua</item>
        <item>Glegoo</item>
        <item>Gloria Hallelujah</item>
        <item>Goblin One</item>
        <item>Gochi Hand</item>
        <item>Gorditas</item>
        <item>Goudy Bookletter 1911</item>
        <item>Graduate</item>
        <item>Grand Hotel</item>
        <item>Gravitas One</item>
        <item>Great Vibes</item>
        <item>Griffy</item>
        <item>Gruppo</item>
        <item>Gudea</item>
        <item>Gurajada</item>
        <item>Habibi</item>
        <item>Halant</item>
        <item>Hammersmith One</item>
        <item>Hanalei</item>
        <item>Hanalei Fill</item>
        <item>Handlee</item>
        <item>Hanuman</item>
        <item>Happy Monkey</item>
        <item>Harmattan</item>
        <item>Headland One</item>
        <item>Heebo</item>
        <item>Henny Penny</item>
        <item>Herr Von Muellerhoff</item>
        <item>Hind</item>
        <item>Hind Guntur</item>
        <item>Hind Madurai</item>
        <item>Hind Siliguri</item>
        <item>Hind Vadodara</item>
        <item>Holtwood One SC</item>
        <item>Homemade Apple</item>
        <item>Homenaje</item>
        <item>IM Fell DW Pica</item>
        <item>IM Fell DW Pica SC</item>
        <item>IM Fell Double Pica</item>
        <item>IM Fell Double Pica SC</item>
        <item>IM Fell English</item>
        <item>IM Fell English SC</item>
        <item>IM Fell French Canon</item>
        <item>IM Fell French Canon SC</item>
        <item>IM Fell Great Primer</item>
        <item>IM Fell Great Primer SC</item>
        <item>Iceberg</item>
        <item>Iceland</item>
        <item>Imprima</item>
        <item>Inconsolata</item>
        <item>Inder</item>
        <item>Indie Flower</item>
        <item>Inika</item>
        <item>Inknut Antiqua</item>
        <item>Irish Grover</item>
        <item>Istok Web</item>
        <item>Italiana</item>
        <item>Italianno</item>
        <item>Itim</item>
        <item>Jacques Francois</item>
        <item>Jacques Francois Shadow</item>
        <item>Jaldi</item>
        <item>Jim Nightshade</item>
        <item>Jockey One</item>
        <item>Jolly Lodger</item>
        <item>Jomhuria</item>
        <item>Josefin Sans</item>
        <item>Josefin Slab</item>
        <item>Joti One</item>
        <item>Judson</item>
        <item>Julee</item>
        <item>Julius Sans One</item>
        <item>Junge</item>
        <item>Jura</item>
        <item>Just Another Hand</item>
        <item>Just Me Again Down Here</item>
        <item>Kadwa</item>
        <item>Kalam</item>
        <item>Kameron</item>
        <item>Kanit</item>
        <item>Kantumruy</item>
        <item>Karla</item>
        <item>Karma</item>
        <item>Katibeh</item>
        <item>Kaushan Script</item>
        <item>Kavivanar</item>
        <item>Kavoon</item>
        <item>Kdam Thmor</item>
        <item>Keania One</item>
        <item>Kelly Slab</item>
        <item>Kenia</item>
        <item>Khand</item>
        <item>Khmer</item>
        <item>Khula</item>
        <item>Kite One</item>
        <item>Knewave</item>
        <item>Kotta One</item>
        <item>Koulen</item>
        <item>Kranky</item>
        <item>Kreon</item>
        <item>Kristi</item>
        <item>Krona One</item>
        <item>Kumar One</item>
        <item>Kumar One Outline</item>
        <item>Kurale</item>
        <item>La Belle Aurore</item>
        <item>Laila</item>
        <item>Lakki Reddy</item>
        <item>Lalezar</item>
        <item>Lancelot</item>
        <item>Lateef</item>
        <item>Lato</item>
        <item>League Script</item>
        <item>Leckerli One</item>
        <item>Ledger</item>
        <item>Lekton</item>
        <item>Lemon</item>
        <item>Lemonada</item>
        <item>Libre Baskerville</item>
        <item>Libre Franklin</item>
        <item>Life Savers</item>
        <item>Lilita One</item>
        <item>Lily Script One</item>
        <item>Limelight</item>
        <item>Linden Hill</item>
        <item>Lobster</item>
        <item>Lobster Two</item>
        <item>Londrina Outline</item>
        <item>Londrina Shadow</item>
        <item>Londrina Sketch</item>
        <item>Londrina Solid</item>
        <item>Lora</item>
        <item>Love Ya Like A Sister</item>
        <item>Loved by the King</item>
        <item>Lovers Quarrel</item>
        <item>Luckiest Guy</item>
        <item>Lusitana</item>
        <item>Lustria</item>
        <item>Macondo</item>
        <item>Macondo Swash Caps</item>
        <item>Mada</item>
        <item>Magra</item>
        <item>Maiden Orange</item>
        <item>Maitree</item>
        <item>Mako</item>
        <item>Mallanna</item>
        <item>Mandali</item>
        <item>Marcellus</item>
        <item>Marcellus SC</item>
        <item>Marck Script</item>
        <item>Margarine</item>
        <item>Marko One</item>
        <item>Marmelad</item>
        <item>Martel</item>
        <item>Martel Sans</item>
        <item>Marvel</item>
        <item>Mate</item>
        <item>Mate SC</item>
        <item>Maven Pro</item>
        <item>McLaren</item>
        <item>Meddon</item>
        <item>MedievalSharp</item>
        <item>Medula One</item>
        <item>Meera Inimai</item>
        <item>Megrim</item>
        <item>Meie Script</item>
        <item>Merienda</item>
        <item>Merienda One</item>
        <item>Merriweather</item>
        <item>Merriweather Sans</item>
        <item>Metal</item>
        <item>Metal Mania</item>
        <item>Metamorphous</item>
        <item>Metrophobic</item>
        <item>Michroma</item>
        <item>Milonga</item>
        <item>Miltonian</item>
        <item>Miltonian Tattoo</item>
        <item>Miniver</item>
        <item>Miriam Libre</item>
        <item>Mirza</item>
        <item>Miss Fajardose</item>
        <item>Mitr</item>
        <item>Modak</item>
        <item>Modern Antiqua</item>
        <item>Mogra</item>
        <item>Molengo</item>
        <item>Molle</item>
        <item>Monda</item>
        <item>Monofett</item>
        <item>Monoton</item>
        <item>Monsieur La Doulaise</item>
        <item>Montaga</item>
        <item>Montez</item>
        <item>Montserrat</item>
        <item>Montserrat Alternates</item>
        <item>Montserrat Subrayada</item>
        <item>Moul</item>
        <item>Moulpali</item>
        <item>Mountains of Christmas</item>
        <item>Mouse Memoirs</item>
        <item>Mr Bedfort</item>
        <item>Mr Dafoe</item>
        <item>Mr De Haviland</item>
        <item>Mrs Saint Delafield</item>
        <item>Mrs Sheppards</item>
        <item>Mukta Vaani</item>
        <item>Muli</item>
        <item>Mystery Quest</item>
        <item>NTR</item>
        <item>Neucha</item>
        <item>Neuton</item>
        <item>New Rocker</item>
        <item>News Cycle</item>
        <item>Niconne</item>
        <item>Nixie One</item>
        <item>Nobile</item>
        <item>Nokora</item>
        <item>Norican</item>
        <item>Nosifer</item>
        <item>Nothing You Could Do</item>
        <item>Noticia Text</item>
        <item>Noto Sans</item>
        <item>Noto Serif</item>
        <item>Nova Cut</item>
        <item>Nova Flat</item>
        <item>Nova Mono</item>
        <item>Nova Oval</item>
        <item>Nova Round</item>
        <item>Nova Script</item>
        <item>Nova Slim</item>
        <item>Nova Square</item>
        <item>Numans</item>
        <item>Nunito</item>
        <item>Nunito Sans</item>
        <item>Odor Mean Chey</item>
        <item>Offside</item>
        <item>Old Standard TT</item>
        <item>Oldenburg</item>
        <item>Oleo Script</item>
        <item>Oleo Script Swash Caps</item>
        <item>Open Sans</item>
        <item>Open Sans Condensed</item>
        <item>Oranienbaum</item>
        <item>Orbitron</item>
        <item>Oregano</item>
        <item>Orienta</item>
        <item>Original Surfer</item>
        <item>Oswald</item>
        <item>Over the Rainbow</item>
        <item>Overlock</item>
        <item>Overlock SC</item>
        <item>Overpass</item>
        <item>Overpass Mono</item>
        <item>Ovo</item>
        <item>Oxygen</item>
        <item>Oxygen Mono</item>
        <item>PT Mono</item>
        <item>PT Sans</item>
        <item>PT Sans Caption</item>
        <item>PT Sans Narrow</item>
        <item>PT Serif</item>
        <item>PT Serif Caption</item>
        <item>Pacifico</item>
        <item>Padauk</item>
        <item>Palanquin</item>
        <item>Palanquin Dark</item>
        <item>Pangolin</item>
        <item>Paprika</item>
        <item>Parisienne</item>
        <item>Passero One</item>
        <item>Passion One</item>
        <item>Pathway Gothic One</item>
        <item>Patrick Hand</item>
        <item>Patrick Hand SC</item>
        <item>Pattaya</item>
        <item>Patua One</item>
        <item>Pavanam</item>
        <item>Paytone One</item>
        <item>Peddana</item>
        <item>Peralta</item>
        <item>Permanent Marker</item>
        <item>Petit Formal Script</item>
        <item>Petrona</item>
        <item>Philosopher</item>
        <item>Piedra</item>
        <item>Pinyon Script</item>
        <item>Pirata One</item>
        <item>Plaster</item>
        <item>Play</item>
        <item>Playball</item>
        <item>Playfair Display</item>
        <item>Playfair Display SC</item>
        <item>Podkova</item>
        <item>Poiret One</item>
        <item>Poller One</item>
        <item>Poly</item>
        <item>Pompiere</item>
        <item>Pontano Sans</item>
        <item>Poppins</item>
        <item>Port Lligat Sans</item>
        <item>Port Lligat Slab</item>
        <item>Pragati Narrow</item>
        <item>Prata</item>
        <item>Preahvihear</item>
        <item>Press Start 2P</item>
        <item>Pridi</item>
        <item>Princess Sofia</item>
        <item>Prociono</item>
        <item>Prompt</item>
        <item>Prosto One</item>
        <item>Proza Libre</item>
        <item>Puritan</item>
        <item>Purple Purse</item>
        <item>Quando</item>
        <item>Quantico</item>
        <item>Quattrocento</item>
        <item>Quattrocento Sans</item>
        <item>Questrial</item>
        <item>Quicksand</item>
        <item>Quintessential</item>
        <item>Qwigley</item>
        <item>Racing Sans One</item>
        <item>Radley</item>
        <item>Rajdhani</item>
        <item>Rakkas</item>
        <item>Raleway</item>
        <item>Raleway Dots</item>
        <item>Ramabhadra</item>
        <item>Ramaraja</item>
        <item>Rambla</item>
        <item>Rammetto One</item>
        <item>Ranchers</item>
        <item>Rancho</item>
        <item>Ranga</item>
        <item>Rasa</item>
        <item>Rationale</item>
        <item>Ravi Prakash</item>
        <item>Redressed</item>
        <item>Reem Kufi</item>
        <item>Reenie Beanie</item>
        <item>Revalia</item>
        <item>Rhodium Libre</item>
        <item>Ribeye</item>
        <item>Ribeye Marrow</item>
        <item>Righteous</item>
        <item>Risque</item>
        <item>Roboto</item>
        <item>Roboto Condensed</item>
        <item>Roboto Mono</item>
        <item>Roboto Slab</item>
        <item>Rochester</item>
        <item>Rock Salt</item>
        <item>Rokkitt</item>
        <item>Romanesco</item>
        <item>Ropa Sans</item>
        <item>Rosario</item>
        <item>Rosarivo</item>
        <item>Rouge Script</item>
        <item>Rozha One</item>
        <item>Rubik</item>
        <item>Rubik Mono One</item>
        <item>Ruda</item>
        <item>Rufina</item>
        <item>Ruge Boogie</item>
        <item>Ruluko</item>
        <item>Rum Raisin</item>
        <item>Ruslan Display</item>
        <item>Russo One</item>
        <item>Ruthie</item>
        <item>Rye</item>
        <item>Sacramento</item>
        <item>Sahitya</item>
        <item>Sail</item>
        <item>Salsa</item>
        <item>Sanchez</item>
        <item>Sancreek</item>
        <item>Sansita</item>
        <item>Sarala</item>
        <item>Sarina</item>
        <item>Sarpanch</item>
        <item>Satisfy</item>
        <item>Scada</item>
        <item>Scheherazade</item>
        <item>Schoolbell</item>
        <item>Scope One</item>
        <item>Seaweed Script</item>
        <item>Secular One</item>
        <item>Sevillana</item>
        <item>Seymour One</item>
        <item>Shadows Into Light</item>
        <item>Shadows Into Light Two</item>
        <item>Shanti</item>
        <item>Share</item>
        <item>Share Tech</item>
        <item>Share Tech Mono</item>
        <item>Shojumaru</item>
        <item>Short Stack</item>
        <item>Shrikhand</item>
        <item>Siemreap</item>
        <item>Sigmar One</item>
        <item>Signika</item>
        <item>Signika Negative</item>
        <item>Simonetta</item>
        <item>Sintony</item>
        <item>Sirin Stencil</item>
        <item>Six Caps</item>
        <item>Skranji</item>
        <item>Slabo 13px</item>
        <item>Slabo 27px</item>
        <item>Slackey</item>
        <item>Smokum</item>
        <item>Smythe</item>
        <item>Sniglet</item>
        <item>Snippet</item>
        <item>Snowburst One</item>
        <item>Sofadi One</item>
        <item>Sofia</item>
        <item>Sonsie One</item>
        <item>Sorts Mill Goudy</item>
        <item>Source Code Pro</item>
        <item>Source Sans Pro</item>
        <item>Source Serif Pro</item>
        <item>Space Mono</item>
        <item>Special Elite</item>
        <item>Spicy Rice</item>
        <item>Spinnaker</item>
        <item>Spirax</item>
        <item>Squada One</item>
        <item>Sree Krushnadevaraya</item>
        <item>Sriracha</item>
        <item>Stalemate</item>
        <item>Stalinist One</item>
        <item>Stardos Stencil</item>
        <item>Stint Ultra Condensed</item>
        <item>Stint Ultra Expanded</item>
        <item>Stoke</item>
        <item>Strait</item>
        <item>Sue Ellen Francisco</item>
        <item>Suez One</item>
        <item>Sumana</item>
        <item>Sunshiney</item>
        <item>Supermercado One</item>
        <item>Sura</item>
        <item>Suranna</item>
        <item>Suravaram</item>
        <item>Suwannaphum</item>
        <item>Swanky and Moo Moo</item>
        <item>Syncopate</item>
        <item>Tangerine</item>
        <item>Taprom</item>
        <item>Tauri</item>
        <item>Taviraj</item>
        <item>Teko</item>
        <item>Telex</item>
        <item>Tenali Ramakrishna</item>
        <item>Tenor Sans</item>
        <item>Text Me One</item>
        <item>The Girl Next Door</item>
        <item>Tienne</item>
        <item>Tillana</item>
        <item>Timmana</item>
        <item>Tinos</item>
        <item>Titan One</item>
        <item>Titillium Web</item>
        <item>Trade Winds</item>
        <item>Trirong</item>
        <item>Trocchi</item>
        <item>Trochut</item>
        <item>Trykker</item>
        <item>Tulpen One</item>
        <item>Ubuntu</item>
        <item>Ubuntu Condensed</item>
        <item>Ubuntu Mono</item>
        <item>Ultra</item>
        <item>Uncial Antiqua</item>
        <item>Underdog</item>
        <item>Unica One</item>
        <item>UnifrakturCook</item>
        <item>UnifrakturMaguntia</item>
        <item>Unkempt</item>
        <item>Unlock</item>
        <item>Unna</item>
        <item>VT323</item>
        <item>Vampiro One</item>
        <item>Varela</item>
        <item>Varela Round</item>
        <item>Vast Shadow</item>
        <item>Vesper Libre</item>
        <item>Vibur</item>
        <item>Vidaloka</item>
        <item>Viga</item>
        <item>Voces</item>
        <item>Volkhov</item>
        <item>Vollkorn</item>
        <item>Voltaire</item>
        <item>Waiting for the Sunrise</item>
        <item>Wallpoet</item>
        <item>Walter Turncoat</item>
        <item>Warnes</item>
        <item>Wellfleet</item>
        <item>Wendy One</item>
        <item>Wire One</item>
        <item>Work Sans</item>
        <item>Yanone Kaffeesatz</item>
        <item>Yantramanav</item>
        <item>Yatra One</item>
        <item>Yellowtail</item>
        <item>Yeseva One</item>
        <item>Yesteryear</item>
        <item>Yrsa</item>
        <item>Zeyada</item>
    </string-array>
</resources>

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="app_name">Downloadable fonts sample</string>
    <string name="request">request</string>
    <string name="invalid_family_name">Not a valid Family Name</string>
    <string name="invalid_input">Invalid inputs exist</string>
    <string name="family_name">Family Name</string>
    <string name="weight">Weight</string>
    <string name="width">Width</string>
    <string name="italic">Italic</string>
    <string name="best_effort">Best Effort (Nearest match)</string>
    <string name="predefined_font">The pre-downloaded font is used for this part to avoid the overhead of the time until the requested font is downloaded. See "src/main/res/font" directory for usage.</string>
    <string name="downloadable_font_applied_text">Downloadable Fonts Demo - CoderzHeaven.com</string>
    <string name="request_failed">Font request failed with reason code: %1$d</string>
</resources>

we also need font certificates.

font_certs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <array name="com_google_android_gms_fonts_certs">
        <item>@array/com_google_android_gms_fonts_certs_dev</item>
        <item>@array/com_google_android_gms_fonts_certs_prod</item>
    </array>
    <string-array name="com_google_android_gms_fonts_certs_dev">
        <item>
            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
        </item>
    </string-array>
    <string-array name="com_google_android_gms_fonts_certs_prod">
        <item>
            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
        </item>
    </string-array>
</resources>

Default font

preloaded_fonts.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <array name="preloaded_fonts" translatable="false">
        <item>@font/lobster_two</item>
    </array>
</resources>

dimens.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <!-- Default screen margins, per the Android Design guidelines. -->
    <dimen name="activity_horizontal_margin">4dp</dimen>
    <dimen name="activity_vertical_margin">4dp</dimen>
    <dimen name="margin_small">8dp</dimen>
    <dimen name="margin_medium">16dp</dimen>
    <dimen name="margin_large">32dp</dimen>

    <dimen name="bottom_sheet_top_margin">48dp</dimen>
    <dimen name="bottom_sheet_initial_height">96dp</dimen>
</resources>

Font Query

Below is the query for downloading the font.


package com.example.android.downloadablefonts

/**
 * Builder class for constructing a query for downloading a font.
 */
internal class QueryBuilder(val familyName: String,
                            val width: Float? = null,
                            val weight: Int? = null,
                            val italic: Float? = null,
                            val besteffort: Boolean? = null) {

    fun build(): String {
        if (weight == null && width == null && italic == null && besteffort == null) {
            return familyName
        }
        val builder = StringBuilder()
        builder.append("name=").append(familyName)
        weight?.let { builder.append("&weight=").append(weight) }
        width?.let { builder.append("&width=").append(width) }
        italic?.let { builder.append("&italic=").append(italic) }
        besteffort?.let { builder.append("&besteffort=").append(besteffort) }
        return builder.toString()
    }
}

MainActivity

The main activity that downloads the font and apply it to the textview.

package com.example.android.downloadablefonts

import android.graphics.Typeface
import android.os.Bundle
import android.os.Handler
import android.os.HandlerThread
import android.support.design.widget.TextInputLayout
import android.support.v4.provider.FontRequest
import android.support.v4.provider.FontsContractCompat
import android.support.v4.util.ArraySet
import android.support.v7.app.AppCompatActivity
import android.text.Editable
import android.text.TextWatcher
import android.util.Log
import android.view.View
import android.widget.ArrayAdapter
import android.widget.AutoCompleteTextView
import android.widget.Button
import android.widget.CheckBox
import android.widget.ProgressBar
import android.widget.SeekBar
import android.widget.TextView
import android.widget.Toast

import java.util.Arrays

import com.example.android.downloadablefonts.Constants.ITALIC_DEFAULT
import com.example.android.downloadablefonts.Constants.WEIGHT_DEFAULT
import com.example.android.downloadablefonts.Constants.WEIGHT_MAX
import com.example.android.downloadablefonts.Constants.WIDTH_DEFAULT
import com.example.android.downloadablefonts.Constants.WIDTH_MAX

class MainActivity : AppCompatActivity() {

    lateinit private var mHandler: Handler

    lateinit private var mDownloadableFontTextView: TextView
    lateinit private var mRequestDownloadButton: Button

    lateinit private var mFamilyNameSet: ArraySet<String>

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val handlerThread = HandlerThread("fonts")
        handlerThread.start()
        mHandler = Handler(handlerThread.looper)
        mFamilyNameSet = ArraySet<String>()
        mFamilyNameSet.addAll(Arrays.asList(*resources.getStringArray(R.array.family_names)))

        mDownloadableFontTextView = findViewById<TextView>(R.id.textview)
        val adapter = ArrayAdapter(this,
                android.R.layout.simple_dropdown_item_1line,
                resources.getStringArray(R.array.family_names))
        val familyNameInput = findViewById<TextInputLayout>(R.id.auto_complete_family_name_input)
        val autoCompleteFamilyName = findViewById<AutoCompleteTextView>(R.id.auto_complete_family_name)
        autoCompleteFamilyName.setAdapter<ArrayAdapter<String>>(adapter)
        autoCompleteFamilyName.addTextChangedListener(object : TextWatcher {
            override fun beforeTextChanged(charSequence: CharSequence, start: Int, count: Int,
                                           after: Int) {
                // No op
            }

            override fun onTextChanged(charSequence: CharSequence, start: Int, count: Int, after: Int) {
                if (isValidFamilyName(charSequence.toString())) {
                    familyNameInput.isErrorEnabled = false
                    familyNameInput.error = ""
                } else {
                    familyNameInput.isErrorEnabled = true
                    familyNameInput.error = getString(R.string.invalid_family_name)
                }
            }

            override fun afterTextChanged(editable: Editable) {
                // No op
            }
        })

        mRequestDownloadButton = findViewById<Button>(R.id.button_request)
        mRequestDownloadButton.setOnClickListener(View.OnClickListener {
            val familyName = autoCompleteFamilyName.getText().toString()
            if (!isValidFamilyName(familyName)) {
                familyNameInput.isErrorEnabled = true
                familyNameInput.error = getString(R.string.invalid_family_name)
                Toast.makeText(
                        this@MainActivity,
                        R.string.invalid_input,
                        Toast.LENGTH_SHORT).show()
                return@OnClickListener
            }
            requestDownload(familyName)
            mRequestDownloadButton.isEnabled = false
        })
    }

    private fun requestDownload(familyName: String) {
        val queryBuilder = QueryBuilder(familyName,
                width = 2f,
                weight = 100,
                italic = 0f,
                besteffort = true)
        val query = queryBuilder.build()

        Log.d(TAG, "Requesting a font. Query: " + query)
        val request = FontRequest(
                "com.google.android.gms.fonts",
                "com.google.android.gms",
                query,
                R.array.com_google_android_gms_fonts_certs)

        val progressBar = findViewById<ProgressBar>(R.id.progressBar)
        progressBar.visibility = View.VISIBLE

        val callback = object : FontsContractCompat.FontRequestCallback() {
            override fun onTypefaceRetrieved(typeface: Typeface) {
                mDownloadableFontTextView.typeface = typeface
                progressBar.visibility = View.GONE
                mRequestDownloadButton.isEnabled = true
            }

            override fun onTypefaceRequestFailed(reason: Int) {
                Toast.makeText(this@MainActivity,
                        getString(R.string.request_failed, reason), Toast.LENGTH_LONG)
                        .show()
                progressBar.visibility = View.GONE
                mRequestDownloadButton.isEnabled = true
            }
        }
        FontsContractCompat
                .requestFont(this@MainActivity, request, callback, mHandler)
    }

    private fun isValidFamilyName(familyName: String?): Boolean {
        return familyName != null && mFamilyNameSet.contains(familyName)
    }

    companion object {
        private val TAG = "MainActivity"
    }
}

Build.gradle

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'

ext {
    supportLibVersion = '26.0.1'
}

android {
    compileSdkVersion 26
    buildToolsVersion '26.0.2'

    defaultConfig {
        applicationId "com.example.android.downloadablefonts"
        minSdkVersion 14
        targetSdkVersion 26
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }

    dependencies {
        compile "com.android.support:appcompat-v7:$supportLibVersion"
        compile "com.android.support:design:$supportLibVersion"
        compile "com.android.support:cardview-v7:$supportLibVersion"
    }
}

repositories {
    mavenCentral()
}
dependencies {
    compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
}
 

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