Accessing File System and Sharing the File by Wi-fi ,Bluetooth or Cable in Android

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http://stackoverflow.com – I have a question : I want to develop an App which shares file between device via WI-FI or Bluetooth or by cable... Suppose I want to get a File from Device "A" , From Device "B" I want to list All the Files from Device "A" and which ever file i need ill click and file should be transferred to device B.. Can this be possible please suggest me with some example or how to do this App or some links similar to this prob. (HowTos)