Membuat Efek Drop Shadow pada ActionBar dengan Layer-List (Android)

bg_header.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <!-- Drop Shadow -->
    <item>
        <shape>
            <padding android:bottom="4dp" />

            <solid android:color="#00000000" />
        </shape>
    </item>
    <item>
        <shape>
            <padding android:bottom="3dp" />

            <solid android:color="#10000000" />
        </shape>
    </item>
    <item>
        <shape>
            <padding android:bottom="2dp" />

            <solid android:color="#20000000" />
        </shape>
    </item>
    <item>
        <shape>
            <gradient
                android:angle="270"
                android:endColor="#6FEEE4"
                android:startColor="#E2EEF4" />
        </shape>
    </item>
</layer-list>

simpan file bg_header.xml di folder drawable, kemudian buat file actionbar.xml

actionbar.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="65dp"
    android:background="@drawable/bg_header"
    android:orientation="horizontal" >

</LinearLayout>