How can I change the color of the bottom border of my ActionBar in Android?

Question

I'm trying to achieve a bottom border effect for my ActionBar, similar to this image:

Here's what I've tried so far in my styles.xml:

<style name="MyActionBar"
        parent="@android:style/Widget.Holo.Light.ActionBar.Solid.Inverse">
        <item name="android:titleTextStyle">@style/TitleTextStyle</item>
        <item name="android:background">#088A29</item>
        <item name="android:backgroundStacked">#088A29</item>
        <item name="android:backgroundSplit">#0B3B0B</item>
        <item name="android:layout_marginBottom">5dp</item>

I've added a margin at the bottom, but the margin appears white. How can I change the color of this bottom margin to match the ActionBar background color?

Thank you for your assistance!

Answer 1

For me the following solution worked perfectly and smooth.

<style name="MyActionBar"
    parent="@android:style/Widget.Holo.Light.ActionBar.Solid.Inverse">
    <item name="android:titleTextStyle">@style/TitleTextStyle</item>
    <item name="android:background">@drawable/custom_background_bar</item>
    <item name="android:layout_marginBottom">5dp</item>

And of course I built the custom_background_bar that I saved into drawable forlder.

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
  <item>
    <shape android:shape="rectangle" >
      <solid android:color="#ffff0000" />
    </shape>
  </item>
  <item android:top="-3dp" android:right="-3dp" android:left="-3dp">
    <shape>
      <solid android:color="@android:color/transparent" />
      <stroke
          android:width="2dp"
          android:color="#ff00ff00" />
    </shape>
  </item>
</layer-list>

You are free to change #ffff0000 (the background bar color) and #ff00ff00 (the bottom border color) with the values you prefer. You can change also then thickness and style of the border or add other shape and elements inside the layer-list. You can also set again another drawable as background and give shade or transparency as you prefer.

I hope it will help.