Android 4.4 (API level 19) introduces the Storage Access Framework (SAF). The SAF lets users browse and open documents, images, and other files across all of their preferred document storage providers. A standard, easy-to-use UI lets users browse files and access recent files in a consistent way across apps and providers.
Cloud or local storage services can participate in this ecosystem by implementing a DocumentsProvider that encapsulates their services. Client apps that need access to a provider’s documents can integrate with the SAF with a few lines of code.