PlayerAndroid/app/src/main/res/drawable/color_progress_seek.xml

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@android:id/background">
        <shape>
            <corners android:radius="8dp" />
            <solid android:color="?android:colorButtonNormal" />
        </shape>
    </item>

    <item android:id="@android:id/progress">
        <scale android:scaleWidth="100%">
            <shape>
                <corners android:radius="8dp" />
                <solid android:color="@color/md_red_400" />
            </shape>
        </scale>
    </item>
</layer-list>