how to use two strok in xml android

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">



<item>
    <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="rectangle">

        <stroke android:width="3px" android:color="#477135" />
    </shape>

</item>
<item >
    <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="rectangle">
        <gradient android:startColor="#81c557" android:endColor="#539942"
            android:angle="270" />

        <stroke android:width="1px" android:color="#a8d78a" />
    </shape>
</item>