A Gist to remember the four color attributes for the Lollipop action bar / navigation bar

lollipop-actionbar-style

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="AppTheme" parent="android:Theme.Material">

        <!--Cannot be transparent-->
        <item name="android:colorPrimary">@color/colorPrimary</item>

        <!--Can be transparent-->
        <item name="android:colorPrimaryDark">@color/colorPrimaryDark</item>

        <!--Can be transparent-->
        <item name="android:colorAccent">@color/accent</item>

        <!--Can be transparent-->
        <item name="android:navigationBarColor">@color/accent</item>
    </style>
</resources>