Preview in Android studio

Android studio layout preview function makes life so easy, you can choose your theme, API level to preview. So it’s very easy to simultaneously develop themes under different APIs. At the moment, I am developing two themes. One is for API 21 Lollipop and API 15 for IceCreamSandwich. API 15 will cover 90.4% of devices that are active on Google Play store.

Holo Action Bar

Background:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <!-- the theme applied to the application or activity -->
    <style name="CustomActionBarTheme"
           parent="@android:style/Theme.Holo.Light.DarkActionBar">
        <item name="android:actionBarStyle">@style/MyActionBar</item>
    </style>

    <!-- ActionBar styles -->
    <style name="MyActionBar"
           parent="@android:style/Widget.Holo.Light.ActionBar.Solid.Inverse">
        <item name="android:background">@drawable/actionbar_background</item>
    </style>
</resources>