AndroidAPS/app/src/main/res/xml/pref_loop.xml

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

    <PreferenceCategory
        android:key="aps_general"
        android:title="@string/loop">

        <ListPreference
            android:title="@string/apsmode_title"
            android:key="@string/key_aps_mode"
            android:defaultValue="open"
            android:entries="@array/aps_modeArray"
            android:entryValues="@array/aps_modeValues"/>

        <com.andreabaccega.widget.ValidatingEditTextPreference
            android:defaultValue="20"
            android:dialogMessage="@string/loop_openmode_min_change_summary"
            android:digits="0123456789"
            android:inputType="number"
            android:key="@string/key_loop_openmode_min_change"
            android:maxLines="1"
            android:selectAllOnFocus="true"
            android:singleLine="true"
            android:title="@string/loop_openmode_min_change"
            validate:maxNumber="50"
            validate:minNumber="0"
            validate:testType="numericRange" />

    </PreferenceCategory>
</PreferenceScreen>