NewPipe/app/src/main/res/values/attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <attr name="progress_horizontal_drawable" format="reference" />
    <!-- Can't refer to colors directly in drawable's xml-->
    <attr name="toolbar_shadow" format="reference" />
    <attr name="selector" format="reference" />
    <attr name="checked_selector" format="reference" />
    <attr name="focused_selector" format="reference" />
    <attr name="dashed_border" format="reference" />

    <attr name="actionColor" format="color" />
    <attr name="separator_color" format="color" />
    <attr name="contrast_background_color" format="color" />
    <attr name="windowBackground" format="color" />
    <attr name="colorPrimary" format="color" />
    <attr name="toolbarSearchColor" format="reference|color" />

    <attr name="card_item_background_color" format="color" />
    <attr name="card_item_contrast_color" format="color" />
    <attr name="border_color" format="color" />
</resources>