public void onSensorChanged(SensorEvent event) {
        // TODO Auto-generated method stub
        // In this example, alpha is calculated as t / (t + dT),
          // where t is the low-pass filter's time-constant and
          // dT is the event delivery rate.

          final float alpha = (float) 0.8;

          Log.v(SENSOR_SERVICE, "on sensor change");

        // Isolate the force of gravity with the low-pass filter.
          gravity[0] = alpha * gravity[0] + (1 - alpha) * event.values[0];
          gravity[1] = alpha * gravity[1] + (1 - alpha) * event.values[1];
          gravity[2] = alpha * gravity[2] + (1 - alpha) * event.values[2];


        // Show changes on screen.
          TextView textView = (TextView) findViewById(R.id.axl_x);
          textView.setText(Float.toString(gravity[0]));

          textView = (TextView) findViewById(R.id.axl_y);
          textView.setText(Float.toString(gravity[1]));


          textView = (TextView) findViewById(R.id.axl_y);
          textView.setText(Float.toString(gravity[2]));

    }