安卓在TabLayout中消除标签阴影

<style name="CustomTabLayout" parent="Widget.Design.TabLayout">
    <item name="tabIndicatorColor">@android:color/transparent</item>
    <item name="tabIndicatorHeight">0dp</item>
    <item name="tabBackground">@drawable/tab_background</item>
</style>

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true">
        <shape android:shape="rectangle">
            <solid android:color="@android:color/white" />
        </shape>
    </item>
    <item>
        <shape android:shape="rectangle">
            <solid android:color="@android:color/transparent" />
        </shape>
    </item>
</selector>

<android.support.design.widget.TabLayout
    android:id="@+id/tabLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    style="@style/CustomTabLayout" />