public void startSampling(final SensorEventListener listener) {
samples.clear();
Sensor accelerometer = sensor.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
calibrationStartTime = System.currentTimeMillis();
sensor.registerListener(listener, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
}
private void updateSlidingWindow() {
if (samples.size() == WINDOW_SIZE) {
double min = Collections.min(samples);
double max = Collections.max(samples);
double mean = mean(samples);
double stdDev = standardDeviation(samples);
displayElapsedTime();
addInstance(min, max, mean, stdDev, activityLabel);
saveInstances();
discardOverlap();
}
}
public void onSensorChanged(final SensorEvent event) {
samples.add(readSensorData(event));
updateSlidingWindow();
}
private void discardOverlap() {
for (int i = 0; i < OVERLAP_SIZE; i++) {
samples.removeFirst();
}
}