Added constructors for activity and textView in ThreadDemo

app/src/main/AndroidManifest.xml

         android:theme="@style/Theme.Ueberwachungssystem"
         tools:targetApi="31">
         <activity
-            android:name=".Beschleunigungssensor"
+            android:name=".MainActivity"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

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

     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;

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

 
 import androidx.appcompat.app.AppCompatActivity;
 
+import android.content.Context;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.TextView;
 public class MainActivity extends AppCompatActivity implements View.OnClickListener {
 
     private Logger logger;
+    private Context context;
     //private Accelerometer beschleunigungssensor;
-    //private SensorManager sensorManager;
+    private ThreadDemo threadDemo;
     private TextView textViewLog;
     private TextView textViewWorkerThread;
+
     //private WorkerUsingThread workerUsingThread;
     ToggleButton toggleButton1;
 
         toggleButton1 = (ToggleButton) findViewById(R.id.toggleButton1); //togglebutton um Thread zu steuern
         toggleButton1.setOnClickListener(this);
         textViewWorkerThread = (TextView) findViewById(R.id.textViewWorkerThread); //TextView um Thread zu überwachen
-
+        // beschleunigungssensor = new Accelerometer(this);
+        threadDemo = new ThreadDemo(this, textViewWorkerThread);
         logger.log("onCreate");
     }
 
     protected void onPause() {
         super.onPause();
         //beschleunigungssensor.stop();
+        threadDemo.stop();
+
     }
 
 
         logger.log("toggleButton1 is clicked");
         if (toggleButton1.isChecked()) {
             logger.log("ToggleButton is ON");
+            //beschleunigungssensor.start();
+            threadDemo.start();
         } else {
             logger.log("ToggleButton is OFF");
+            threadDemo.stop();
         }
     }
 }

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

     private volatile boolean running = false;
     private Thread thread;
     private String threadname = "testThread";
-    Logger logger;
+    //Logger logger;
+    TextView textViewWorkerThread;
 
     // Passing Activity's instance as argument on worker thread
     AppCompatActivity activity;
-    public ThreadDemo(AppCompatActivity activity){
+    public ThreadDemo(AppCompatActivity activity, TextView textViewWorkerThread){
         this.activity = activity;
+        this.textViewWorkerThread = textViewWorkerThread;
     }
-
     //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);
+                textViewWorkerThread.setText(s);
             }
         });
     }
     }
 
     void start() {
-        logger.log("Starting " + threadname + "...");
+        //logger.log("Starting " + threadname + "...");
         running = true;
         thread = new Thread(this);
         thread.setName(threadname);
         thread.start();
-        logger.log("..." + threadname + " started");
+        //logger.log("..." + threadname + " started");
     }
     void stop() {
         if (!running) {
-            logger.log(threadname + " not running");
+            //logger.log(threadname + " not running");
         } else {
-            logger.log("Stopping " + threadname + "...");
+            //logger.log("Stopping " + threadname + "...");
             running = false;
             while(true){
                 try {
                     thread.join();
-                    logger.log("... " + threadname + " stopped");
+                    //logger.log("... " + threadname + " stopped");
                     break;
                 } catch (InterruptedException e) {
                     e.printStackTrace();

app/src/main/res/layout/activity_main.xml

         android:id="@+id/textViewLog"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
+        android:text="TextViewLoggerMain"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         android:layout_marginStart="174dp"
         android:layout_marginTop="85dp"
         android:layout_marginEnd="179dp"
-        android:text="TextView"
+        android:text="textViewWorkerThreadTextView"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/toggleButton1" />