If you already have the key got the link below and add the fingerprint along with your android project package name
You also need to login to your google account
https://code.google.com/apis/console
Click on create new key. Add the fingerprint along with your android project package name.
You can see the api key above
Enable google map api v2 from services tab.
Then in manifest file under application tag
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="my key"/>
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