[android-developers] how to apply preference style in user-defined theme

I defined a theme with an item named "android:preferenceStyle", how
ever when I apply this theme to some activity, the related preference
items' style are still not what I defined.
The following is my style I defined and the usage.

frameworks\base\core\res\res\values\themes.xml:

<style name="CustomActivityTheme">
<item name="android:windowBackground">@drawable/bg_color</
item>
<item name="android:preferenceStyle">@android:style/MyPreference</
item>
<item name="android:windowTitleSize">54dip</item>
</style>

frameworks\base\core\res\res\values\styles.xml:

<style name="MyPreference">
<item name="android:layout">@android:layout/my_preference_layout</
item>
</style>

in CustomActivityTheme, the windowBackground has effect I can change
the color what I need, but MyPreference won't work, that means the
layout does't work.

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