ar_contact

<resources>
    <string-array name="articles_images_thumbnail_array">
        <item>@drawable/ar_contact</item>
    </string-array>
</resources>

res/drawable-hdpi-v4/ar_contact.png

id = resources.getStringArray(R.array.articles_images_thumbnail_array)[articleIndex];

imageThumbnail.setImageResource(id);