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

    <!-- background -->
    <item
        android:id="@android:id/background"
        android:drawable="@drawable/progress_bg">
    </item>
    <!-- progress -->
    <item
        android:id="@android:id/progress"
        android:drawable="@drawable/progress_primary">
    </item>
    <!-- second progress -->

    <item
        android:id="@android:id/secondaryProgress"
        android:drawable="@drawable/progress_primary">
    </item>

</layer-list>