Swago/lib_beautyui/src/main/res/drawable/seekbar_thumb.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval">

    <size
        android:width="16dp"
        android:height="16dp"
        />
    <solid android:color="#ff56b7"/>
</shape>