<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item
    android:drawable="@drawable/ic_launcher">
</item>
<item>
    <rotate
        android:fromDegrees="-45"
        android:toDegrees="0"
        android:pivotX="150%"
        android:pivotY="20%" >
        <shape
            android:shape="rectangle" >
            <solid android:color="#ff0000" />
        </shape>
    </rotate>
</item>
</layer-list>

android:background="@drawable/triangle"