title: Remove default group header icon of Expandable listview
body: <p>I am not able to remove Group header icon of Expandable listview,can anybody tell me how to set it to null in xml.. </p>
  
  <p><strong>Update</strong></p>
  
  <pre><code>&lt;ExpandableListView android:id="@+id/elist"
      android:layout_marginTop="1dip" android:layout_weight="1"
      android:layout_width="fill_parent" android:layout_height="wrap_content"
      android:fastScrollEnabled="true" android:scrollbarSize="4dip"
      android:smoothScrollbar="true" android:scrollbars="horizontal"
      android:groupIndicator="@null" /&gt;
  </code></pre>
  
  <p>and my Group header i am Using following xml</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:orientation="horizontal" android:layout_width="fill_parent"
      android:layout_height="wrap_content"&gt;
      &lt;ImageView android:id="@+id/ImageView01"
          android:layout_height="wrap_content" android:src="@drawable/zimbabwe"
          android:layout_width="wrap_content"
          android:layout_marginLeft="10dip"&gt;
      &lt;/ImageView&gt;
      &lt;TextView android:id="@+id/childname"
          android:paddingLeft="35dip" android:textSize="16dip"
          android:layout_width="fill_parent" android:layout_height="wrap_content" /&gt;
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>but its not working for me</p>
  
  <p>My <code>SimpleExpandableListAdapter</code> is:</p>
  
  <pre><code>SimpleExpandableListAdapter expListAdapter = new SimpleExpandableListAdapter( this, 
          createBetGroupList("spot"), 
          R.layout.group_row, new String[] { "BetGroup" }, 
          new int[] { R.id.childname }, createBetChildList("spot") , 
          R.layout.child_row, new String[] { "betText","betRate","betID" }, 
          new int[] { R.id.txtBetText, R.id.txtdecRate,R.id.txtstrBetID} );
  </code></pre>