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1.Because the Maps library is not a part of the standard Android library, you must declare it in the Android Manifest as a child of the element:
<xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/mapview" android:layout_width="fill_parent" android:layout_height="fill_parent" android:clickable="true" android:apiKey="Your Maps API Key goes here" />
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原文地址：http://www.cnblogs.com/qionglouyuyu/p/4620223.html
