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added in API level 9

android.os.storage

Contains classes for the system storage service, which manages binary asset filesystems known as Opaque Binary Blobs (OBBs).

Classes

OnObbStateChangeListener Used for receiving notifications from StorageManager about OBB file states. 
StorageManager StorageManager is the interface to the systems storage service. 
StorageVolume Information about a shared/external storage volume for a specific user.