android:duplicateParentState属性解释在listview中的应用

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listview的item布局范例

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    >
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:duplicateParentState="true"
        android:background="@mipmap/service_list_item_bg">
    //ImageView选中框要放在一个指定大小的布局中
    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:duplicateParentState="true"
        android:scaleType="fitXY"
        android:background="@drawable/service_list_select"/>
    </RelativeLayout>
</RelativeLayout>

service_list_select内容为：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_focused="true" android:drawable="@drawable/service_list_select_shape"/>
    <item android:state_pressed="true" android:drawable="@drawable/service_list_select_shape" />
    <item android:state_selected="true" android:drawable="@drawable/service_list_select_shape"/>
    <item android:state_focused="false" android:drawable="@android:color/transparent"/>
</selector>