You would read and write audio in the same way as if a headset was
installed.
I strongly suspect that Square just communicates with its reader using
audio signals. Kind of like how old modems would transfer digital
data across analog phone connections. The only data they really have
to transfer
Check out AudioRecord:
http://developer.android.com/reference/android/media/AudioRecord.html
You can use that to record audio, music, or, magnetic card strips like
Square does...
On Dec 21, 11:00 pm, PhotoSteve dfwgoph...@gmail.com wrote:
How would you get access to the audio jack to perform
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