How to get google maps api key

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http://stackoverflow.com – How to get google maps api key for android, i have read more one articles but not success. i look code android as below: <?xml version="1.0" encoding="utf-8"?> <com.google.android.maps.MapView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/mapview" android:layout_width="fill_parent" android:layout_height="fill_parent" android:apiKey="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" android:clickable="true" /> So my question how to get xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx from google? Please give me step by step, thanks. Thanks. (HowTos)