mihon/app/src/main/res/xml/pref_downloads.xml

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

    <ListPreference android:title="@string/pref_download_threads"
        android:key="@string/pref_download_threads_key"
        android:entries="@array/download_threads"
        android:entryValues="@array/download_threads"
        android:defaultValue="1"
        android:summary="%s"/>

</PreferenceScreen>