android自定义Theme，标题栏下出现一条蓝线，如何去掉？

Question

自定义的Theme parent是Holo.Light
改了背景颜色和标题栏文字颜色
然后发现标题栏下面出现一条蓝线
设置actionpider、pider都无法去掉
求教如何才能去掉它？
网上搜到的方法都是Dialog对话框里出现这个怎么改变颜色，可我这不是Dialog对话框，就是应用的主Activity.

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="android:Theme.Holo.Light">
        <item name="android:actionBarStyle">@style/MyActionBar</item>
        <!--  背景色 <color name="background">#37474F</color> -->
        <item name="android:windowBackground">@color/background</item>
    </style>

    <style name="MyActionBar" parent="@android:style/Widget.Holo.ActionBar">
        <item name="android:titleTextStyle">@style/TextAppearance.Holo.Widget.ActionBar.Title.Own</item>
    </style>

    <style name="TextAppearance.Holo.Widget.ActionBar.Title.Own" parent="@android:style/TextAppearance.Holo.Widget.ActionBar.Title">
        <item name="android:textColor">#ffffff</item>
    </style>

</resources>

Answer 1

解决了 用了这种布局之后解决了

<resources>

    <style name="customTheme" parent="@android:style/Theme.Holo.Light">
        <item name="android:actionBarStyle">@style/CustomActionBarStyle</item>
        <item name="android:windowBackground">@color/background</item>
        <item name="android:actionOverflowButtonStyle">@style/CustomActionOverflowButtonStyle</item>
    </style>

    <style name="CustomActionBarStyle" parent="@android:style/Widget.ActionBar">

        <!-- Change action bar background color -->
        <item name="android:background">@color/background</item>
        <item name="android:titleTextStyle">@style/CustomTitleTextStyle</item>
    </style>

    <style name="CustomTitleTextStyle" parent="@android:style/TextAppearance.Holo.Widget.ActionBar.Title">
        <!-- Change action bar title color -->
        <item name="android:textColor">#ffffff</item>
    </style>

    <style name="CustomActionOverflowButtonStyle" parent="@android:style/Widget.Holo.Light.ActionButton.Overflow">
        <!-- Change overflow button background color -->
        <item name="android:background">@color/background</item>
    </style>

</resources>