Semi transparent image background in Android shape xml

Question

I want to make a rectange object (shape) with gradient and below it image background. I've got:

    <?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
<shape
    android:shape="rectangle">
    <gradient
        android:type="linear"
        android:startColor="#BF0e2634"
        android:endColor="#BF0e2634"
        android:angle="270"/>
    <stroke
        android:width="1dp"
        android:color="#0e2634" >
    </stroke>

    <size
        android:width="15dp"
        android:height="15dp"/>



    <corners android:topLeftRadius="3dp" android:topRightRadius="3dp"
        android:bottomLeftRadius="3dp" android:bottomRightRadius="3dp"/>
</shape></item>

    <item
        android:drawable="@drawable/galaxy"
        android:alpha="0.2"
      />

    </layer-list>

But the image is overide the rectange with stroke and gradient. Please help me guys!