Android : No resource identifier found for attribute 'apikey' in package 'android'

<?xml version ="1.0" encoding ="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <com.google.android.maps.Mapview
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:clickable="true"
        android:id="@+id/themap"
        android:apikey = "AIzaSyDc9ac67bCYPqhVYz9pxhTJsK9shZH3iQg"

        />
    </LinearLayout>

it is my activity_main.xml file ...bt it shows the error mentioned above...i have also included android:name="com.google.android.maps" in my manifest file..plz help