Add an equals method to Contact.
A contact is equals to an other if they got the same bare Jid.
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<rotate android:fromDegrees="0" android:toDegrees="360"
android:pivotX="50%" android:pivotY="50%"
android:duration="5000"
android:repeatMode="restart"
android:repeatCount="infinite" />
</set>