change xml layout attribute dynamically

<item>
    <shape android:shape="rectangle" >

<gradient
    android:endColor="#FFFFFF"
    android:startColor="#A9A9A9"
    android:type="linear" />


        <stroke
            android:width="2dp"
            android:color="#5E2612" />


        <corners
            android:bottomLeftRadius="10dp"
            android:bottomRightRadius="10dp"
            android:topLeftRadius="10dp"
            android:topRightRadius="10dp" />
    </shape>
</item>
<item
    android:bottom="4dp"
    android:left="4dp"
    android:right="4dp"
    android:top="4dp">
    <shape android:shape="rectangle" >
        <gradient
            android:angle="90"
            android:endColor="#A9A9A9"
            android:startColor="#FFFFFF"
            android:type="linear" />

        <corners
            android:bottomLeftRadius="10dp"
            android:bottomRightRadius="10dp"
            android:topLeftRadius="10dp"
            android:topRightRadius="10dp" />


    </shape>
</item>

I have a background of a button as above. In my app, I allow user to change color of buttons (the startColor and endColor), of the two items.

Is it possible to set background for buttons dynamically in my situation?