Drop shadow effect for all android versions

drop_shadow.xml

<?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:angle="360"
                android:centerColor="#dcdcdc"
                android:endColor="#e7e7e7"
                android:gradientRadius="360"
                android:startColor="#95ececec"
                android:type="radial" />
            <corners android:radius="4dp"/>
            <stroke
                android:width="1dp"
                android:color="#bcf2f2f2" />
        </shape>
    </item>
    <item
        android:bottom="2dp"
        android:left="2dp"
        android:right="2dp"
        android:top="2dp">
        <shape android:shape="rectangle" >
            <solid android:color="#fff" />
            <corners android:radius="4dp"/>
        </shape>
    </item>

</layer-list>

Its just a background drawable.