删除listView多余的部分

渲染一系列图片的listVIew，我想要去掉灰色。怎么实现？

list_View.xml

<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#efefef"
    android:orientation="vertical" >
    <ListView
        android:id="@android:id/list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"

        android:cacheColorHint="#00000000"
        android:divider="@android:color/black"
        android:dividerHeight="1.0sp"
        android:textColor="#000000" />

</RelativeLayout>

image.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="#A4A4A4"
    android:orientation="horizontal" >

    <ImageView
        android:id="@+id/imageStatus"
        android:layout_alignParentTop="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:adjustViewBounds="true" />

</LinearLayout>

image.xml里的

android:background="#A4A4A4"

删掉即可，或者改成透明色