Actionbar showing a background even when there is none

Question

I am using a custom theme to show custom background on my actionbar. M using Actionbar Compat. I run on different devices and it gave strange result in mobiles + versions < 3.0. So after some testing i found out that even after i set a transparent color as my background m still getting something. same code works fine on my nexus 4. See the attached picture.

My Manifest:

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="17" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name">
    <activity
        android:name="com.abtest.MainActivity"
        android:label="@string/app_name" 
        android:theme="@style/CustomActionBarTheme">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

My Styles:

<style name="Widget.Custom.TitleTextStyle" parent="@style/TextAppearance.AppCompat.Widget.ActionBar.Title">
    <item name="android:textColor">@color/actionbar_text_color</item>
</style>

<style name="Widget.Custom.Common" parent="@style/Widget.AppCompat.ActionBar">
    <item name="titleTextStyle">@style/Widget.Custom.TitleTextStyle</item>
</style>

<style name="CustomActionBarTheme" parent="@style/Theme.AppCompat.Light">
    <item name="actionBarStyle">@style/MyActionBar</item>
</style>

<style name="MyActionBar" parent="@style/Widget.Custom.Common">
    <item name="background">@color/actionbar_background</item>
    <item name="android:windowContentOverlay">@null</item>
    <item name="windowActionBarOverlay">false</item>
</style>

My Actionbar Background:

<color name="actionbar_background">#00000000</color>

Answer 1

Move android:windowContentOverlay into your CustomActionBarTheme definition. E.g.

<style name="CustomActionBarTheme" parent="@style/Theme.AppCompat.Light">
    <item name="android:windowContentOverlay">@null</item>
    <item name="actionBarStyle">@style/MyActionBar</item>
</style>