ListPreference default value not showing up

I tried to set the default value for a ListPreference but nothing shows up.

Can you check my code for any errors?

Thanks.

Truly, Emad

This is in the settings.xml file:

<PreferenceCategory android:title="Media:">
    <CheckBoxPreference android:key="ChimeWhenMusicIsPlaying"
        android:title="@string/ChimeWhenMusicIsPlayingTitle" android:summary="@string/ChimeWhenMusicIsPlayingSummary"
        android:defaultValue="false" />

    <ListPreference android:title="Chime Volume"
        android:key="ChimeVolume" android:summary="Select volume for the chiming sound."
        android:entries="@array/chimeVolumeLabels" android:entryValues="@array/chimeVolumeValues"
        android:defaultValue="1" />

</PreferenceCategory>

This is in the arrays file:

<resources>

    <string-array name="chimeVolumeLabels">
    <item>Default</item>
    <item>Soft</item>
    <item>Medium</item>
    <item>Loud</item>
    </string-array>

    <string-array name="chimeVolumeValues">
    <item>1</item>
    <item>2</item>
    <item>3</item>
    <item>4</item>
    </string-array>
</resources>

I found that sometime I need to clear application data. Uninstall and reinstall the app. After that, everything works as expected.