Closing the database in a ContentProvider

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According to Dianne Hackborn (Android framework engineer) there is no need to close the database in a content provider.

A content provider is created when its hosting process is created, and
remains around for as long as the process does, so there is no need to
close the database — it will get closed as part of the kernel
cleaning up the process’s resources when the process is killed.

Thanks @bigstones for pointing this out.

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