Please confirm that you are accessing the right index on the analog channels array.
Indexes in Java start in 0, in which case the position of the ACC should be the channel number -1.
Also, adding a sleep is not desirable as this introduces a delay that may cause the device to stop acquiring or loose samples.
To see the data running in real time like in OpenSignals you need to acquire data in a loop.
The BITalino Team