I’m trying to add Google map in to may app, so I have taken the API key. Unfortunately when I inserted the API key in manifest.xml through a meta-data tag, it automatically
Delete your "com.google.android.maps.v2.API_KEY"
meta-data entry.
The "com.google.android.geo.API_KEY"
entry is sufficient for both the Maps and Places services.
Source: https://code.google.com/p/gmaps-api-issues/issues/detail?id=7824
EDIT - Google updated their documents to explicitly call this out now: