Android 在列表视图中，当单击列表项时，应在第二次（仅单击项）时闪烁不同颜色的背景，我如何才能做到这一点？

我的列表视图

<ListView android:id="@+id/list" android:layout_marginLeft="10dip"
    android:layout_below="@+id/date" android:layout_width="fill_parent"
    android:layout_height="wrap_content" android:fadingEdge="none"
    android:focusable="true" android:background="@drawable/newshape_list"
    android:cacheColorHint="#ffffffff" android:scrollbars="none"
    android:layout_marginRight="10dip" android:dividerHeight="1dip"
    android:footerDividersEnabled = "false" android:headerDividersEnabled = "false"
    android:paddingLeft="1dip" android:paddingRight="1dip"
    android:layout_marginTop="8dip" android:divider="#A9ABAD"
    android:layout_marginBottom="60dip"/>

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"> 

  <item 
    android:state_pressed="true" 
    android:state_selected="false" 
    android:drawable="@drawable/focused"/> 

  <item 
    android:state_pressed="true" 
    android:state_focused="false"
    android:drawable="@drawable/selected" />

</selector> 

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <drawable name="focused">#ff5500</drawable>
  <drawable name="selected">#FF00FF</drawable>
</resources>

    lv1 = (ListView) findViewById(R.id.list);
    lv1.setSelector( R.drawable.list_selector);