sheishuoAPP/uikit/res/drawable/nim_actionbar_black_bg.xml

<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <item>
        <shape android:shape="rectangle" >

            <solid android:color="@color/color_black_000000_88_transparent" />

        </shape>
    </item>
    <item android:bottom="2px">
        <shape android:shape="rectangle" >

            <solid android:color="@color/color_black_333333_90_transparent" />

        </shape>
    </item>

</layer-list>