title: Android ListView displays ListSelector only after scrolling
body: <p>I added a simple <code>ListSelector</code> to the <code>ListView</code>.
  The Problem is, that the <code>ListSelector</code> is only displayed, after the ListView is scrolled a little.</p>
  
  <p>How can I make the <code>ListSelector</code> to apear immediately on select?</p>
  
  <p><strong>ListView</strong></p>
  
  <pre><code>&lt;ListView
      android:id="@+id/contentListView"
      android:layout_width="fill_parent"
      android:layout_height="0dp"
      android:layout_alignParentLeft="true"
      android:layout_alignParentRight="true"
      android:layout_alignParentTop="true" 
      android:layout_above="@id/buttonEntwerten" 
      android:scrollingCache="false"
      android:cacheColorHint="#00000000"
  
      android:listSelector="@drawable/list_selector"
  /&gt;
  </code></pre>
  
  <p><strong>@drawable/list_selector</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;selector xmlns:android="http://schemas.android.com/apk/res/android"&gt;
       &lt;item android:drawable="@drawable/list_selector__gradient_bg_hover" /&gt;
  &lt;/selector&gt;
  </code></pre>