colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#3F51B5</color>
    <color name="colorPrimaryDark">#303F9F</color>
    <color name="colorAccent">#FF4081</color>
</resources>

dimens.xml

<resources>
    <!-- Default screen margins, per the Android Design guidelines. -->
    <dimen name="activity_horizontal_margin">16dp</dimen>
    <dimen name="activity_vertical_margin">16dp</dimen>
</resources>

strings.xml

<resources>
    <string name="app_name">PhotoGallery</string>
    <string name="search">Search</string>
    <string name="clear_search">Clear Search</string>
    <string name="start_polling">Start polling</string>
    <string name="stop_polling">Stop polling</string>
    <string name="new_pictures_title">New PhotoGallery Pictures</string>
    <string name="new_pictures_text">You have new pictures in PhotoGallery.</string>
</resources>

styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

</resources>