agv_pro_ros2/rtabmap/app/android/res/drawable/custom_seekbar.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item>
        <shape>
            <gradient
                android:endColor="#00ffffff"
                android:startColor="#ff686868"
                android:useLevel="false" />
        </shape>
    </item>

</layer-list>