I am using Tabhost for project Tabs. I changed the color of the tab to blue but there is 2px line bellow the tab. Can any one help me to change the white color to blue. http://img816.imageshack.us/img816/228/device.png
There's probably something wrong with your screen design not related to TabHost. Did you check the screen/widgets/layouts paddings?
The following code snippet does exactly what you want. Add another Tab and that's it.
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"/>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_above="@android:id/tabs">
<include android:id="@+id/tab1" layout="@layout/tab1" />
<include android:id="@+id/tab2" layout="@layout/tab2" />
<include android:id="@+id/tab3" layout="@layout/tab3" />
</FrameLayout>
</RelativeLayout>
</TabHost>