TreeView didn't require any custom views or custom setup all you need is just a Recyclerview
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
If you want to support 2D Scrolling you should add your RecyclerView in HorizontalScrollView
<HorizontalScrollView
android:fillViewport="true"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical" />
</HorizontalScrollView>
You can Change the scroll bar color and size like any other RecyclerView