amm_sdk_sample/res/layout/mm_preference_image.xml

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

	<ImageView
		android:id="@+id/image_iv"
		android:layout_width="fill_parent"
		android:layout_height="wrap_content"
		android:padding="20dp"/>

</LinearLayout>