custom_seekbar_progress_drawable.xml

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

    <item android:id="@android:id/background">
        <shape>
            <corners android:radius="20dp" />

            <gradient
                android:angle="-90"
                android:centerColor="@android:color/black"
                android:centerX="1"
                android:type="linear"
                
                android:endColor="@android:color/darker_gray"
                android:gradientRadius="50"
                android:startColor="@android:color/darker_gray" />
        </shape>
    </item>
    <item android:id="@android:id/secondaryProgress">
        <clip
            android:clipOrientation="horizontal"
            android:gravity="left" >
            <shape>
                <corners android:radius="20dp" />

                <gradient
                    android:angle="0"
                    android:centerColor="@color/color_black_semi_1_656262"
                    android:centerX="0.75"
                    android:endColor="@color/color_black_semi_1_656262"
                    android:startColor="@color/color_black_semi_1_656262" />
            </shape>
        </clip>
    </item>
    <item android:id="@android:id/progress">
        <clip
            android:clipOrientation="horizontal"
            android:gravity="left" >
            <shape>
                <corners android:radius="20dp" />

                <gradient
                    android:angle="0"
                    android:centerColor="@color/color_seekbar_progress_main"
                    android:centerX="0.75"
                    android:endColor="@color/color_seekbar_progress_main"
                    android:startColor="@color/color_seekbar_progress_main" />
            </shape>
        </clip>
    </item>

</layer-list>

layout.xml

<SeekBar
android:id="@+id/sbVolume"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:indeterminate="false"
android:max="100"
android:maxHeight="10dp"
android:progressDrawable="@drawable/custom_seekbar_progress_drawable"
android:thumb="@drawable/music_bar_slider"
android:thumbOffset="0.5dp" />