You can find some better solutions seaching online. I think the issue is that accelerometers basically sense acceleration, that is, how much the velocity (meters/second) increases or decreases per second. Tapping the phone creates a large instantaneous acceleration. So does the phone's vibrator. I would say a shake is a sequence of high velocities over a certain min-max time window, that alternate in direction a certain number of times. The time derivative of that motion is what the accelerometer would see. You can either integrate the sampled accelerometer output and filter the resultant sampled velocities, or create a filter directly on the sampled accelerometer output. In either case, it's helpful to look at a plot of the values you are trying to filter. I'm suprised there isn't standard library code for this in the SDK.
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