I want to flip image for button's background in xml. I've seen example how to do it, but it was programmatically way: <http://xjaphx.wordpress.com/2011/06/26/image-processing-image-flipping-mirroring>. 
Anyway, I have a xml file (button\_left\_state.xml) like below :

```
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">  
<item android:state_pressed="true" >
    <rotate android:fromDegrees="180.0" android:toDegrees="180.0" 
    android:pivotX="50%" android:pivotY="50%" android:drawable="@drawable/buttonrightpressed" />    
</item>    

<item>
  <rotate android:fromDegrees="180.0" android:toDegrees="0.0" 
    android:pivotX="50%" android:pivotY="50%" android:drawable="@drawable/buttonright"/>
</item>   
</selector>

```

But this code just rotate image to 180 degrees.
Is it possible to flip image in xml?