escreen/app/src/main/res/drawable/seekbar_thumb.xml

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

    <item android:drawable="@mipmap/seekbar_thumb_selected" android:state_pressed="true"/>
    <item android:drawable="@mipmap/seekbar_thumb_selected" android:state_focused="true"/>
    <item android:drawable="@mipmap/seekbar_thumb_normal"></item>

</selector>