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Android USB OTG Read Usb Drive

I am currently working on a project that requires Usb Host mode in Android (using 4.2.2). I need to be able to perform standard file operations, such as listing files and reading from a USB drive. Using the documentation in host mode, I went so far as to be able to detect that the drive is connected, is a USB storage device and finds various endpoints.

Where am I stuck, what to do after that. I guess I don’t understand the difference between control and mass transfers, or in the case of control transfers, what really happens. Unfortunately, my knowledge of the USB interface is somewhat limited, and I heard that the documentation is rather complicated.

Can someone help me help or point me to a working example, what do I need to do to essentially “install” a USB drive? As I said earlier, I just need these file operations with listing files and their reading, not writing. I should also mention that the target phone is Samsung's Galaxy Nexus.

thank

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The management endpoint (usually) is used to send commands to the USB device.
An endpoint in bulk (usually) is used to transfer data to a USB device.

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