Tablayout自定义下划线样式

    <com.google.android.material.tabs.TabLayout
            android:layout_width="match_parent"
            android:layout_height="@dimen/dp_56"
            app:tabBackground="@drawable/selector_tab_indicator"
            app:tabIndicatorHeight="@dimen/dp_0"
            app:tabMode="fixed"
            app:tabSelectedTextColor="@color/color_FF4089"
            app:tabTextAppearance="@style/CustomTabLayoutTextAppearance"
            app:tabTextColor="@color/color_141414" />
    <style name="CustomTabLayoutTextAppearance" parent="android:TextAppearance.Widget.TabWidget">
        <item name="android:textAllCaps">false</item>
        <item name="android:textSize">@dimen/sp_16</item>
        <item name="android:textStyle">normal</item>
        <item name="android:textColor">@color/color_white</item>
    </style>

selector_tab_indicator

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/shape_tab_indicator_selected" android:state_checked="true"/>
<item android:drawable="@drawable/shape_tab_indicator_selected" android:state_pressed="true"/>
<item android:drawable="@drawable/shape_tab_indicator_selected" android:state_selected="true"/>
<item android:drawable="@drawable/shape_tab_indicator" />
</selector>

shape_tab_indicator_selected

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape>
            <solid android:color="@color/color_white" />
        </shape>
    </item>
    <item
        android:top="@dimen/dp_52"
        android:gravity="bottom|center_horizontal">
        <shape>
            <solid android:color="@color/color_FF4089" />
        </shape>
    </item>
</layer-list>

shape_tab_indicator

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape>
            <solid android:color="@color/color_white" />
        </shape>
    </item>
    <item     android:top="@dimen/dp_52"
        android:gravity="bottom|center_horizontal">
        <shape>
            <solid android:color="@color/color_FFE2ED" />
        </shape>
    </item>
</layer-list>