Added Accelerometer as Runnable Class and ThreadDemo as example

app/src/main/java/com/example/ueberwachungssystem/Accelerometer.java

+package com.example.ueberwachungssystem;
+
+
+
+import android.content.Context;
+import android.hardware.Sensor;
+import android.hardware.SensorEvent;
+import android.hardware.SensorEventListener;
+import android.hardware.SensorManager;
+import android.widget.TextView;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+
+public class Accelerometer implements Runnable, SensorEventListener {
+
+    Logger logger;
+    private volatile boolean running = false;
+    public SensorManager sensorManager;
+    private int sensorType = Sensor.TYPE_ACCELEROMETER;
+    private Sensor accelerometer;
+    private Context context;
+    private Thread thread;
+    private String threadName = "Accelerometer Thread";
+    double[] gravity = new double[3];
+    double[] linear_acceleration = new double[3];
+    private TextView textViewWorkerThread;
+
+    // In constructor pass Context from MainActivity in Accelerometer class
+    public Accelerometer(Context context, TextView textViewWorkerThread){
+        this.context = context;
+        this.textViewWorkerThread = textViewWorkerThread;
+    }
+    // Passing Activity's instance as argument on worker thread
+    AppCompatActivity activity;
+    public Accelerometer(AppCompatActivity activity){
+        this.activity = activity;
+    }
+
+    private void print (final String s){
+        activity.runOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                textViewWorkerThread.setText(s);
+            }
+        });
+    }
+
+    @Override
+    public void run() {
+        while (running) {
+            sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
+            if (sensorManager.getSensorList(sensorType).size() == 0) {
+                logger.log("Es gibt den gewünschten Sensor nicht");
+                accelerometer = null;
+            } else {
+                accelerometer = sensorManager.getSensorList(sensorType).get(0);
+            }
+        }
+    }
+    void start(){
+        logger.log("Starting" + threadName);
+        running = true;
+        thread = new Thread(this);
+        thread.setName(threadName);
+        thread.start();
+        logger.log("alright, " + threadName + " started!");
+
+        // register the sensor before using //
+        sensorManager.registerListener((SensorEventListener) context, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
+        logger.log("Accelerometer, du bist dran!");
+    }
+
+    void stop() {
+        // unregister from the sensor to stop using it //
+        sensorManager.unregisterListener((SensorEventListener) context, accelerometer);
+        logger.log("Das reicht Accelerometer, komm zurück!");
+        if (!running){
+            logger.log(threadName + " not running.");
+        } else {
+            logger.log("Stopping " + threadName);
+            running = false;
+            while (true) {
+                try {
+                    thread.join();
+                    logger.log("..." + threadName + " stopped");
+                    break;
+                } catch (InterruptedException e){
+                    e.printStackTrace();
+                }
+            }
+        }
+    }
+
+    @Override
+    public void onSensorChanged(SensorEvent event) {
+        // Highpass filter to filter out gravity influence
+        final double alpha = 0.8;
+
+        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];
+        linear_acceleration[0] = event.values[0] - gravity[0];
+
+        linear_acceleration[1] = event.values[1] - gravity[1];
+        linear_acceleration[2] = event.values[2] - gravity[2];
+
+        String sb = "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 --> Wenn Ausrichtung unbekannt ist, müsste kalibrierung bei Start der Bewegungsüberwachung vorgenommen werden
+                "\nlin_x=" + linear_acceleration[0] +
+                "\nlin_x=" + linear_acceleration[1] +
+                "\nlin_x=" + linear_acceleration[2];
+
+        logger.clearLog();
+        logger.log(sb);
+    }
+
+    @Override
+    public void onAccuracyChanged(Sensor sensor, int accuracy) {
+
+    }
+}

app/src/main/java/com/example/ueberwachungssystem/ThreadDemo.java

+package com.example.ueberwachungssystem;
+
+import android.content.Context;
+import android.widget.TextView;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+public class ThreadDemo implements Runnable {
+    private volatile boolean running = false;
+    private Thread thread;
+    private String threadname = "testThread";
+    Logger logger;
+
+    // Passing Activity's instance as argument on worker thread
+    AppCompatActivity activity;
+    public ThreadDemo(AppCompatActivity activity){
+        this.activity = activity;
+    }
+
+    //Method print which delegates access on MainActivity to runOnUiThread
+    private void print(final String s) {
+        activity.runOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                //textViewWorkerThread.setText(s);
+            }
+        });
+    }
+
+    @Override
+    public void run() {
+        int i = 0;
+        while (running) {
+            i++;
+            print(String.valueOf(i));
+            try {
+                Thread.sleep(100);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+        }
+        //print(activity.getString(R.string.workerThread) + " endet mit " + i);
+    }
+
+    void start() {
+        logger.log("Starting " + threadname + "...");
+        running = true;
+        thread = new Thread(this);
+        thread.setName(threadname);
+        thread.start();
+        logger.log("..." + threadname + " started");
+    }
+    void stop() {
+        if (!running) {
+            logger.log(threadname + " not running");
+        } else {
+            logger.log("Stopping " + threadname + "...");
+            running = false;
+            while(true){
+                try {
+                    thread.join();
+                    logger.log("... " + threadname + " stopped");
+                    break;
+                } catch (InterruptedException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+    }
+}