Material Design Transparent ActionBar

Question

I'd like to know if anyone knows how to make an activity with transparent action bar, like the one you have in the new Google Play Store when you go to an app's page.

I don't care about the scrolling and turning from transparent into solid color background, I just need the action bar transparent.

Answer 1

<item name="colorPrimary">@android:color/transparent</item> 

This above will result exception on Lollipop devices. colorPrimary must be opaque.

Stylish your actionbar using style:

<style name="ThemeActionBar"
        parent="Widget.AppCompat.Light.ActionBar.Solid">
        <item name="android:background">@null</item>
        <!-- Support library compatibility -->
        <item name="background">@null</item>
</style>

And in your theme, just include:

<item name="android:actionBarStyle">@style/ThemeActionBar</item>
<item name="android:windowActionBarOverlay">true</item>
<!-- Support library compatibility -->
<item name="actionBarStyle">@style/ThemeActionBar</item>
<item name="windowActionBarOverlay">true</item>