Accelerometer.java

package com.notificationFramework.stimulusStrategy;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.IBinder;
import android.os.SystemClock;
import android.support.annotation.Nullable;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;

import com.notificationFramework.sedentary.frontEnd.R;
import com.notificationFramework.sedentary.frontEnd.SaveFile;

import java.util.Calendar;


/**
 * Created by Peter De Jonckheere on 09/01/2018.
 * <p>
 * The strategy which detects sedentary behaviour using the Accelerometer sensor provided by the
 * Android hardware. It uses the previous readings to determine if movement has occurred. Upon
 * determining a significant enough movement which lasts for a period of 15 seconds, an alarm which
 * is set for one notification period from the current time is cancelled. The Accelerometer sensor
 * reports in a streaming fashion and so uses significant power on the device and the listener for
 * the sensor is constantly registered.
 * </p>
 */

public class Accelerometer extends Service implements StimulusStrategy, SensorEventListener {

    /**
     * The alarm manager instance which is used to manage alarms via the OS
     */
    private AlarmManager am;
    /**
     * An instance of Shared Preferences used throughout the class to obtain and save settings
     */
    private SharedPreferences preferences;
    /**
     * The previous 3 readings of the accelerometer
     */
    private float[] history = new float[3];
    /**
     * The previous timestamp of the accelerometer reading
     */
    private long historyTime;
    /**
     * The last recorded number of minutes moved
     */
    private int prevMinutes = 0;
    /**
     * The current number of minutes moved
     */
    private int minutes;
    /**
     * The current number of seconds moved up to 60
     */
    private double seconds = 0;
    /**
     * The arbitrary default value of sensitivity
     */
    private double sensitivity = 0.8;