Get rid of the line under TabWidget

Question

I've got simple tab activity with next layout:

    <TabWidget
    android:id="@android:id/tabs"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"                  
    android:background="#ffffff00"        />

<FrameLayout            
    android:id="@android:id/tabcontent"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"     
   android:background="#ffffff00"          />

I use buttons as indicators for tabs

tabHost.addTab(tabHost.newTabSpec("Tab1")
                .setIndicator(new Button(this))                
                .setContent(new Intent(this, TabActivity1.class)));   

tabHost.addTab(tabHost.newTabSpec("Tab2")
                .setIndicator(new Button(this))                
                .setContent(new Intent(this, TabActivity2.class)));

In this case FrameLayout always got black line and shadow effect on top (you can see it under buttons):

The question is: How can I get rid of this line? Where is the method that draws it in Android sources?

Answer 1

Apply a custom theme to your activity, and null out the android:windowContentOverlay attribute.

Define a theme in themes.xml:

<style name="YourTheme" parent="if you want">
  ...   
  <item name="android:windowContentOverlay">@null</item>
  ...
</style>

Apply the theme on your application or the activity in AndroidManifest.xml:

<application android:theme="@style/YourTheme"
  ... >

Hope it helps. It caused me lots of headache...