amm_sdk_sample/res/layout/mm_preference_null.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center_vertical" >

    <LinearLayout
        android:id="@+id/content"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="left|center_vertical"
        android:minHeight="@dimen/PreferenceItemHeight"
        android:paddingLeft="10dp"
        android:paddingRight="10dp" />

    <!-- Preference should place its actual preference widget here. -->

    <LinearLayout
        android:id="@+android:id/widget_frame"
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        android:gravity="right|center_vertical"
        android:orientation="vertical" />

</LinearLayout>