Android drawable behind a bitmap - android

I am trying to achieve this crazy thing but I not sure if this is possible using Android drawable.
I have an image which as some transparent parts, then I am trying to have another gradient sweep element behind this Image to rotate so that the transparent parts of image get moving gradient color.
As of now, I am able to get Image and an gradient sweep behind it but it is not rotating and effect is not as I expected. Any suggestion/tips/code snippets will be helpful.
Here is my drawable XML.
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
android:fromDegrees="0"
android:pivotX="50%"
android:pivotY="50%"
android:toDegrees="360">
<shape
android:innerRadiusRatio="15"
android:shape="ring"
android:thicknessRatio="4"
android:useLevel="false">
<gradient
android:angle="0"
android:endColor="#color/colorAccent"
android:startColor="#android:color/white"
android:type="sweep"
android:useLevel="false" />
</shape>
</rotate>
</item>
<item>
<bitmap
android:gravity="center"
android:src="#drawable/inoffline" />
</item>
</layer-list>
and the output image, I have swapped the transparent parts of image so that i could easily verify that both drawable are rendered.
Regards,
Harsha

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