android dropdown Spinner background for expanded state
<p>Is it possible to create selector and define different backgrounds for spinner states when drop down is visible or drop down is hidden.</p>

<p>For instance I have following code:</p>

<pre><code>&lt;Spinner
    android:id="@+id/spinner_task"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:spinnerMode="dropdown"/&gt;

&lt;selector xmlns:android="http://schemas.android.com/apk/res/android"&gt; 
    &lt;item
        android:state_expanded="true" 
        android:drawable="@drawable/dropdownlist_arrow_down" 
        /&gt; 

    &lt;item android:drawable="@drawable/dropdownlist_arrow_up"/&gt; 
&lt;/selector&gt;
</code></pre>

<p>But drawable which is defined for state_expanded never appears.</p>
