Android Accelerometer filtering?

Question

I saw many examples about filtering Accelermeter\'s values, to cancel out the gravity (High-pass filter).

But most of them were 1st order one, which is said to be simple

Answer 1

You can try a higher order FIR or IIR filter which could give you a sharper frequency domain transition. But a more advanced method is to use an adaptive Kalman filter. Here's one article on accelerometers and Kalman filters.