nextcloud-android/res/drawable/actionbar_progress_horizontal.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"
        android:drawable="@color/owncloud_blue" />
    <item android:id="@android:id/secondaryProgress">
        <scale
            android:drawable="@color/owncloud_blue"
            android:scaleWidth="100%" />
    </item>
    <item android:id="@android:id/progress">
        <scale
            android:drawable="@color/owncloud_blue"
            android:scaleWidth="100%" />
    </item>

</layer-list>