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Using animated bar codes, it's possible to send data over the air using only the camera. This app is the barcode decoder (receiver). An encoder (sender) can be seen at cimbar.org.
With CameraFileCopy it is possible to receive data over the camera as a one-way data channel. It does not use any antennas (wifi, bluetooth, nfc, ...) or other tricks. Notably, this means it works just as well in airplane mode.
The app reads animated cimbar codes. Nearly all the interesting logic is from libcimbar – included via a git subtree. he sender component of cfc is a cimbar encoder -- such as cimbar.org'. Navigate to that website (or use libcimbar's
cimbar_send to generate barcodes natively), open a file to initialize the cimbar stream, and point the app+camera at the animated barcode.