Custom SeekBar which changes both Progress Color and Background Color while buffering

Add another layer to your layer-list drawable with the id android:id/secondaryProgress

Refer to this answer: https://stackoverflow.com/a/2021119/2951003

Here's your answer. Just add two lines in seekbar tag in xml

<SeekBar
    android:progressTint="@color/black"
    android:thumbTint="@color/black"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

change color accordingly.