android 中自定义选项卡的问题

Question

有人知道我需要包含什么图像才能消除图片中深红色选项卡底部的小银线吗？

这就是我更改选项卡背景的方式：

public void onCreate (Bundle savedInstanceState)
{
   ...
    setTabTheme();
    tabHost.setOnTabChangedListener (otc);   

   ...
}

// handler for tab changes to make sure our images are loaded
OnTabChangeListener otc = new OnTabChangeListener()
{
   @Override
   public void onTabChanged (String tabId)
   {
      setTabTheme();
   }
};


private void setTabTheme()
{
   tabHost = getTabHost();
   TabWidget twid = tabHost.getTabWidget();

   // set tab color
   for(int i=0; i < tabHost.getTabWidget().getChildCount(); i++)
   {
      // unselected icon
      Drawable tabd = (Drawable) getResources ().getDrawable (R.drawable.tabsel_dkred_big_9);
      tabHost.getTabWidget().getChildAt(i).setBackgroundDrawable (tabd);

      // need to figure out which one to make gray text...
      Log.d (TAG, "this widget focused : " + twid.isFocused ());

      // tab text
      RelativeLayout rLayout = (RelativeLayout) twid.getChildAt(i);

      if (rLayout.getChildCount () > 0)
      {
         TextView tv = ((TextView) rLayout.getChildAt(1));
         tv.setTextColor (Color.WHITE);

         // refer to res/style for text appearance
         tv.setTextAppearance(getBaseContext (), R.style.CustomText);
         Log.d (TAG, "text is " + tv.getText ().toString ());

      }
   }

   // set selected  tab
   Drawable tabd = (Drawable) getResources ().getDrawable (R.drawable.tabsel_red_big_9);
   tabHost.getTabWidget().getChildAt(tabHost.getCurrentTab()).setBackgroundDrawable (tabd); 
}