How can I change selected tab bottom line color

Question

I have a TabWidget. How can I change the bottom line color of the currently selected tab which is defaulted to blue at the moment?

I looked at this answer but it does not say how to change the color...

My layout/main.xml is code :

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">

    <TabHost
        android:id="@android:id/tabhost"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:orientation="vertical" >
            <TabWidget
                android:id="@android:id/tabs"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:alpha="0.75"
                android:focusable="false"
                android:focusableInTouchMode="false"
                android:orientation="horizontal" />

            <FrameLayout
                android:id="@android:id/tabcontent"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:layout_weight="0" />

            <FrameLayout
                android:id="@+id/realtabcontent"

                android:layout_width="fill_parent"
                android:layout_height="0dp"
                android:layout_weight="1" />


        </LinearLayout>
    </TabHost>

</LinearLayout>