MDT5_1_Ueberwachungssystem_G1/app/src/main/java/com/example/ueberwachungssystem/Beschleunigungssensor.java

package com.example.ueberwachungssystem;

import static java.lang.Math.sqrt;

import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import android.widget.TextView;

import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.Collection;
import java.util.Deque;
import java.util.Iterator;
import java.util.OptionalDouble;
import java.util.Queue;

public class Beschleunigungssensor extends AppCompatActivity implements SensorEventListener
{
    private Logger logger;
    private SensorManager sensorManager;
    private static final int sensorType = Sensor.TYPE_LINEAR_ACCELERATION;
    private Sensor sensor;

    //Matrizen für Datenverarbeitung:
    double[] linear_acceleration = new double[3];
    int numberOfValues = 100;
    double[][] calibrationMatrix = new double[3][numberOfValues];
    boolean alarm = false;
    //Preallocate memory for the data of each axis of the acceleration sensor
    double x;
    double y;
    double z;
    double betrag; //Betrag aller drei Achsen sqrt(x*x + y*y + z*z)

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setTitle(this.getClass().getSimpleName());
        TextView textView = new TextView(this);
        setContentView(textView);

        logger = new Logger(this.getClass().getSimpleName(),textView,"");

        sensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE);
        if(sensorManager.getSensorList(sensorType).size()==0)
        {
            logger.log("Es gibt den gewünschten Sensor nicht");
            sensor = null;
        }
        else
        {
            sensor = sensorManager.getSensorList(sensorType).get(0);
        }
    }

    @Override
    protected void onResume()
    {
        super.onResume();
        if(sensor != null)
        {
            if(sensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_NORMAL))
            {
                logger.log("Wir haben uns beim Sensor angemeldet.");
            }
            else
            {
                logger.log("Das Anmelden beim Sensor hat nicht so gut geklappt");
            }
        }
    }

    @Override
    protected void onPause()
    {
        super.onPause();
        if(sensor != null) {
            sensorManager.unregisterListener(this, sensor);
            logger.log("Wir haben uns beim Sensor abgemeldet");
        }
    }

    private void checkAlarm (SensorEvent event) {
        x = event.values[0];
        y = event.values[1];
        z = event.values[2];
        betrag = sqrt(x*x + y*y + z*z);
        double schwelle = 1.5;

        if (!alarm) {
            if (betrag > schwelle) {
                logger.log("Betragswert über Schwelle erkannt, Alarm wird gleich angeschaltet");
                alarm = true;
                logger.log("Alarm an");
                logger.log("Betrag: " + betrag + event.timestamp);
            }
        } else {
            if (betrag < schwelle) {
                logger.log("Alarm ist noch an; Neuer Betragswert unter Schwellwert: " + betrag);
                alarm = false;
                logger.log("Alarm wieder ausgeschaltet");
            } else {
                logger.log("Betragswert immer noch über Schwellwert: " + betrag + "; Alarm bleibt an.");
            }
        }
    }
    int i = 0;
    boolean stopp_mal = false;

    @Override
    public void onSensorChanged(SensorEvent event)
    {
        checkAlarm(event);

        //Alter Code, erstmal wild mit if statement ausgeschlossen
        if (stopp_mal) {
        if (i<numberOfValues) {
            calibrationMatrix[0][i] = event.values[0];
            calibrationMatrix[1][i]  = event.values[1];
            calibrationMatrix[2][i] = event.values[2];
            i++;
        }

        double sumX = 0;
        double sumY = 0;
        double sumZ = 0;
        for (int j = 0; j<numberOfValues;j++){
            sumX += calibrationMatrix[0][j];
            sumY += calibrationMatrix[1][j];
            sumZ += calibrationMatrix[2][j];
        }

        double averageX = sumX/numberOfValues;
        double averageY = sumY/numberOfValues;
        double averageZ = sumZ/numberOfValues;

        String sb2 = "t=" + event.timestamp +
                "\nx=" + event.values[0] + // Wert liegend: x = 0.04
                "\ny=" + event.values[1] + // Wert liegend: y = 0.44
                "\nz=" + event.values[2] + // Wert liegend: z = 9.90 = Erdbeschleunigung
                "\nlin_x=" + linear_acceleration[0] +
                "\nlin_x=" + linear_acceleration[1] +
                "\nlin_x=" + linear_acceleration[2] +
                "\naverageX=" + averageX +
                "\naverageY=" + averageY +
                "\naverageZ=" + averageZ +
                "\ni=" + i;

        double schwelle = 5.0;

            if (alarm = false) {
                if (averageX + schwelle < event.values[0]) {
                    alarm = true;
                }
            }
            if (alarm = false) {
                if (averageY + schwelle < event.values[1]) {
                    alarm = true;
                }
            }
            if (alarm = false) {
                if (averageZ + schwelle < event.values[2]) {
                    alarm = true;
                }
            }
            if (alarm = true) {
                if (averageX + schwelle > event.values[0]) {
                    alarm = false;
                }
                if (averageY + schwelle > event.values[1]) {
                    alarm = false;
                }
                if (averageZ + schwelle > event.values[2]) {
                    alarm = false;
                }
            }


            logger.clearLog();
            logger.log(sb2);
        }

    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy)
    {
    }
}

//Sample code for deque usage. Might be not useful.
class MovingAverage {
    int size, windowSum = 0, count = 0;
    Deque queue = new ArrayDeque<Integer>();
    public MovingAverage(int size) {
        this.size = size;
    }
    public double next(int val) {
        ++count;
        // calculate the new sum by shifting the window
        queue.add(val);
        int tail = count > size ? (int)queue.poll() : 0;
        windowSum = windowSum - tail + val;
        return windowSum * 1.0 / Math.min(size, count);
    }
}