app/build.gradle

         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
+    namespace 'com.example.greenwatch'
 }
 
 dependencies {
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.5'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
+
+    def camerax_version = "1.2.3"
+    implementation "androidx.camera:camera-camera2:${camerax_version}"
+    implementation "androidx.camera:camera-lifecycle:${camerax_version}"
+    implementation "androidx.camera:camera-view:${camerax_version}"
+
 }

app/src/main/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.greenwatch">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.RECORD_AUDIO"/>
+    <uses-permission android:name="android.permission.CAMERA"/>
+    <uses-permission android:name="android.permission.BLUETOOTH"/>
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
+    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+
+    <uses-feature android:name="android.hardware.camera"/>
 
     <application
         android:allowBackup="true"
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+
+        <activity android:name=".KameraAktivitaet" />
+        <activity android:name=".Kamera_Beschleunigungssensor" />
+
     </application>
 
 </manifest>

app/src/main/java/com/example/greenwatch/Kamera.java

-package com.example.greenwatch;
-
-public class Kamera {
-}

app/src/main/java/com/example/greenwatch/KameraAktivitaet.java

+package com.example.greenwatch;
+
+import android.graphics.ImageFormat;
+import android.media.Image;
+import android.os.Bundle;
+import android.os.Handler;
+import android.util.Size;
+
+import android.widget.TextView;
+
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.camera.core.CameraSelector;
+import androidx.camera.core.ImageAnalysis;
+import androidx.camera.lifecycle.ProcessCameraProvider;
+// PREVIEW
+//import androidx.camera.view.PreviewView;
+import androidx.core.content.ContextCompat;
+
+import com.google.common.util.concurrent.ListenableFuture;
+
+import java.nio.ByteBuffer;
+import java.util.concurrent.ExecutionException;
+
+public class KameraAktivitaet extends AppCompatActivity {
+
+    // PREVIEW
+    // private PreviewView previewView;
+    private boolean isMotionDetected;
+    private boolean camera_alarm = false;
+    private TextView alarm;
+
+    // Bildverarbeitung Variablen
+    private ByteBuffer previousBuffer;
+    private int previousWidth;
+    private int previousHeight;
+    private final int threshold = 50;
+    private int startX;
+    private int startY;
+    private int endX;
+    private int endY;
+
+    private static final long ALARM_RESET_DELAY = 5000;
+    private Runnable alarmResetRunnable;
+    private final Handler alarmResetHandler = new Handler();
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        // NUR FÜR TESTS
+        alarm = findViewById(R.id.textView);
+
+        // previewView = findViewById(R.id.previewView);
+
+        final ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(this);
+        cameraProviderFuture.addListener(() -> {
+            try {
+                bindImageAnalysis(cameraProviderFuture.get());
+            } catch (ExecutionException | InterruptedException e) {
+                e.printStackTrace();
+            }
+        }, ContextCompat.getMainExecutor(this));
+    }
+
+    private void bindImageAnalysis(ProcessCameraProvider cameraProvider) {
+        ImageAnalysis.Builder builder = new ImageAnalysis.Builder();
+        builder.setTargetResolution(new Size(640, 480));
+        builder.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST);
+        ImageAnalysis imageAnalysis = builder.build();
+        imageAnalysis.setAnalyzer(
+                ContextCompat.getMainExecutor(this),
+                imageProxy -> {
+
+                    int imageFormat = imageProxy.getFormat();
+
+                    if (imageFormat == ImageFormat.YUV_420_888) {
+
+                        Image currentImage = imageProxy.getImage();
+
+                        if (previousHeight != 0) {
+                            assert currentImage != null;
+                            isMotionDetected = compareFrames(currentImage);
+                        }
+
+                        assert currentImage != null;
+                        Image.Plane[] planes = currentImage.getPlanes();
+                        ByteBuffer buffer = planes[0].getBuffer().duplicate();
+                        previousBuffer = ByteBuffer.allocateDirect(buffer.remaining());
+                        previousBuffer.put(buffer);
+                        previousWidth = currentImage.getWidth();
+                        previousHeight = currentImage.getHeight();
+
+                        currentImage.close();
+
+                        if (isMotionDetected) {
+
+                            alarm.setText("ALARM");
+                            camera_alarm = true;
+
+                            if(alarmResetRunnable != null) {
+                                alarmResetHandler.removeCallbacks(alarmResetRunnable);
+                            }
+
+                            alarmResetRunnable = this::resetAlarmStatus;
+                            alarmResetHandler.postDelayed(alarmResetRunnable, ALARM_RESET_DELAY);
+                        }
+                    }
+
+                    imageProxy.close();
+                });
+
+        // Preview preview = new Preview.Builder().build();
+
+        CameraSelector cameraSelector = new CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build();
+
+        // PREVIEW //
+        // preview.setSurfaceProvider(previewView.getSurfaceProvider());
+
+        cameraProvider.bindToLifecycle(this, cameraSelector, imageAnalysis);
+
+    }
+
+    // Bildverarbeitung zur Bewegungserkennung
+    private boolean compareFrames(Image currentImage) {
+        Image.Plane[] planes = currentImage.getPlanes();
+        ByteBuffer currentBuffer = planes[0].getBuffer();
+        int currentWidth = currentImage.getWidth();
+        int currentHeight = currentImage.getHeight();
+        int yRowStride = planes[0].getRowStride();
+        int yPixelStride = planes[0].getPixelStride();
+
+
+        //System.out.println("Höhe: " + currentHeight + "   Breite: " + currentWidth);
+
+        if (previousWidth != currentWidth || previousHeight != currentHeight) {
+            return false;
+        }
+
+        // Blöcke weiter verkleinern
+        int blockSize = kleinstesQuadrat(previousHeight, previousWidth) / 8;
+
+        //System.out.println(blockSize);
+
+        int numBlocksX = currentWidth / blockSize;
+        int numBlocksY = currentHeight / blockSize;
+
+        for (int blockY = 0; blockY < numBlocksY; blockY++) {
+            for (int blockX = 0; blockX < numBlocksX; blockX++) {
+                startX = blockX * blockSize;
+                startY = blockY * blockSize;
+                endX = startX + blockSize;
+                endY = startY + blockSize;
+
+                float currentLuminance = berechneMittlereLuminanz(currentBuffer, yRowStride, yPixelStride);
+                float previousLuminance = berechneMittlereLuminanz(previousBuffer, yRowStride, yPixelStride);
+
+                int pixelDifference = Math.abs((int) previousLuminance - (int) currentLuminance);
+
+                //System.out.println(pixelDifference);
+
+                if (pixelDifference > threshold) {
+                    System.out.println(pixelDifference);
+                    return true;
+                }
+            }
+        }
+
+        return false;
+    }
+
+    private float berechneMittlereLuminanz(ByteBuffer buffer, int rowStride, int pixelStride) {
+        int sumLuminance = 0;
+        int countPixels = 0;
+
+        for (int row = startY; row < endY; row++) {
+            for (int col = startX; col < endX; col++) {
+                int bufferIndex = row * rowStride + col * pixelStride;
+                int currentPixel = buffer.get(bufferIndex) & 0xFF;
+
+                sumLuminance += currentPixel;
+                countPixels++;
+            }
+        }
+
+        return (float) sumLuminance / countPixels;
+    }
+
+    private int kleinstesQuadrat(int height, int width) {
+        if (height == width) {
+            return height;
+        } else if (height > width) {
+            return kleinstesQuadrat(height - width, width);
+        } else {
+            return kleinstesQuadrat(height, width - height);
+        }
+    }
+
+    private void resetAlarmStatus() {
+        camera_alarm = false;
+        alarm.setText("OK");
+        alarmResetRunnable = null;
+    }
+}
+

app/src/main/java/com/example/greenwatch/Kamera_Beschleunigungssensor.java

+package com.example.greenwatch;
+
+import android.graphics.ImageFormat;
+import android.hardware.Sensor;
+import android.hardware.SensorEvent;
+import android.hardware.SensorEventListener;
+import android.hardware.SensorManager;
+import android.media.Image;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.os.Looper;
+import android.util.Size;
+
+import android.widget.TextView;
+
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.camera.core.CameraSelector;
+import androidx.camera.core.ImageAnalysis;
+import androidx.camera.lifecycle.ProcessCameraProvider;
+// PREVIEW
+//import androidx.camera.view.PreviewView;
+import androidx.core.content.ContextCompat;
+
+import com.google.common.util.concurrent.ListenableFuture;
+
+import java.nio.ByteBuffer;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Executor;
+
+public class Kamera_Beschleunigungssensor extends AppCompatActivity implements SensorEventListener {
+
+    private HandlerThread cameraThread;
+    private Handler cameraHandler;
+    // PREVIEW
+    // private PreviewView previewView;
+    private boolean isMotionDetected;
+    private boolean camera_alarm;
+    private TextView alarm;
+    private ByteBuffer previousBuffer;
+    private int previousWidth;
+    private int previousHeight;
+
+    /////////////////////////////////////
+
+    private SensorManager bsmanager;
+    private ArrayList<Float> Gesamt_be;
+    private int sensorType = Sensor.TYPE_GYROSCOPE, zaehler_runde =0, listen_groesse = 500, kalibrieren, Offset_shared = 0, shared_merk, mittelwertsumme_shared;
+    private Sensor sens, sensor_l;
+    private float x_value = 0, y_value, z_value, Vorbesetzung = 0, gesamt_runde =0;
+    private double Schwellwert = 0.15, mittelwertsumme = 0.0, Offset = 0.1;
+    String Daten, Warnung, Zeitstempel, Array_shared;
+    private final static String KEY_kalibirieren = "KEY_KALIBRIEREN_"+Beschleunigungssensor.class.getSimpleName();
+    private final static String KEY_Gesamt_be = "KEY_GESAMT_BE_"+Beschleunigungssensor.class.getSimpleName();
+    private final static String KEY_Offset = "KEY_OFFSET_"+Beschleunigungssensor.class.getSimpleName();
+    private final static String KEY_Mittelwertsumme = "KEY_MITTELWERTSUMME_"+Beschleunigungssensor.class.getSimpleName();
+    TextView Daten_Bsensor, Warnung_Bsensor, test;
+    private boolean toggle = true, ts_setzen = true, start_messen;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_beschleunigung_kamera);
+        ////////
+        Daten_Bsensor = (TextView) findViewById(R.id.DatenBsensor);
+        Warnung_Bsensor = (TextView) findViewById(R.id.WarnungBsensor);
+        test = (TextView) findViewById(R.id.test);
+
+        bsmanager = (SensorManager) getSystemService(SENSOR_SERVICE);
+        if (bsmanager.getSensorList(Sensor.TYPE_GYROSCOPE).size() == 0) {
+            sens = null;
+            Daten = "kein B Sensor voranden";
+        } else {
+            sens = bsmanager.getSensorList(sensorType).get(0);
+        }
+        Gesamt_be = new ArrayList<Float>();
+        for (int i = 0; i < listen_groesse ; i++){
+            Gesamt_be.add(Vorbesetzung);
+        }
+        kalibrieren = 0;
+        start_messen = false;
+
+        ///////
+        // NUR FÜR TESTS
+        alarm = findViewById(R.id.Alarm_Kamera);
+
+        // PREVIEW //
+        // previewView = findViewById(R.id.previewView);
+
+        final ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(this);
+        cameraProviderFuture.addListener(() -> {
+            try {
+                bindImageAnalysis(cameraProviderFuture.get());
+            } catch (ExecutionException | InterruptedException e) {
+                e.printStackTrace();
+            }
+        }, ContextCompat.getMainExecutor(this));
+    }
+
+    public static String getTimestamp(){
+        Long tslong = System.currentTimeMillis();
+        SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
+        Date date = new Date(tslong);
+        String result = sdf.format(date);
+
+        return result;
+    }
+
+    @Override
+    public void onSensorChanged(SensorEvent event) {
+        StringBuilder sb = new StringBuilder();
+        sb.append("x=").append(event.values[0])//.append(event.timestamp)
+                .append("\ny=").append(event.values[1])
+                .append("\nz=").append(event.values[2]);
+        Daten = sb.toString();
+        Daten_Bsensor.setText(Daten);
+        gesamt_runde = event.values[0] + event.values[1] + event.values[2];
+        Gesamt_be.remove(zaehler_runde);
+        Gesamt_be.add(zaehler_runde, gesamt_runde);
+        mittelwertsumme = 0.0;
+
+        //Mittelwert des Arrays berechnen
+        for (int i = 0; i < listen_groesse; i++){
+            if (Gesamt_be.get(i) < 0){
+                mittelwertsumme += (Gesamt_be.get(i) * (-1));
+            }else {
+                mittelwertsumme += Gesamt_be.get(i);
+            }
+        }
+        mittelwertsumme = mittelwertsumme/listen_groesse;
+        if (kalibrieren < listen_groesse){
+            Offset = mittelwertsumme;
+            kalibrieren++;
+        }else {
+            start_messen = true;
+        }
+        StringBuilder testsb = new StringBuilder();
+        testsb.append(mittelwertsumme);
+        String tests = testsb.toString();
+        test.setText(tests);
+
+        if((mittelwertsumme > (Schwellwert+Offset) ) & (ts_setzen == true) &(start_messen == true)){
+            Zeitstempel = getTimestamp();
+            StringBuilder ts = new StringBuilder();
+            ts.append(Zeitstempel)
+                    .append(", Gruppe3")
+                    .append(", An")
+                    .append(", Bewegung, ")
+                    .append(mittelwertsumme);
+            Warnung = ts.toString();
+            Warnung_Bsensor.setText(Warnung);
+            ts_setzen = false;
+        }else if((mittelwertsumme > (Schwellwert+Offset)) & (ts_setzen == false)){
+        } else if ((mittelwertsumme < (Schwellwert+Offset)) & (ts_setzen == false)) {
+            Warnung_Bsensor.setText("");
+            ts_setzen = true;
+        }
+
+        if (zaehler_runde < (listen_groesse -1)){
+            zaehler_runde++;
+        }else {
+            zaehler_runde = 0;
+        }
+    }
+    //mittelwertsumme ist kein int in diesem programm
+    //shared prefenrences: bei Kippen speichern -> nochmal neu klalibrieren? -> eig ja, weil neuer Standort
+    //Vorbelegung nicht nochmal neu vornehmen -> aus onCreate Funktion raus -> hilfsvariablen auch in shared preferences speichern
+    @Override
+    public void onAccuracyChanged(Sensor sensor, int accuracy) {}
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        if (sens != null) {
+            if (bsmanager.registerListener(this, sens, SensorManager.SENSOR_DELAY_GAME)) {
+                Daten = "Wir haben uns beim Sensor angemeldet";
+            } else {
+                Daten = "Das anmelden hat nicht geklappt";
+            }
+        }
+        //SharedPreferences p = getPreferences(Context.MODE_PRIVATE);
+        //mittelwertsumme_shared = p.getInt(KEY_Mittelwertsumme, 0);
+        //kalibrieren = p.getInt(KEY_kalibirieren, 0);
+        //Offset_shared = p.getInt(KEY_Offset, 0 );
+        //Array_shared = p.getString(KEY_Gesamt_be, "");
+
+        //mittelwertsumme = (double) mittelwertsumme_shared;
+        //mittelwertsumme /= 1000000.0;
+
+        //Offset = (double) Offset_shared;
+        //Offset /= 1000000.0;
+
+        //String zw[] = Array_shared.split(";", listen_groesse);
+
+        //if(shared_merk == 2){
+        //for (int i=0; i<listen_groesse; i++){
+        //float wert = Float.valueOf(zw[i]);
+        //Gesamt_be.add(i, wert);
+        //}}
+
+    }
+
+
+    @Override
+    protected void onPause () {
+        super.onPause();
+        if (sens != null) {
+            bsmanager.unregisterListener(this, sens);
+        }
+        //shared_merk = 2;
+        // Offset_shared = (int) (Offset * 1000000.0);
+        //mittelwertsumme_shared = (int) (mittelwertsumme * 1000000.0);
+
+        //StringBuilder ar = new StringBuilder();
+        //for (int z=0; z < listen_groesse; z++){
+        //ar.append(Gesamt_be.get(z)).append(";");
+        //}
+        //Array_shared = ar.toString();
+
+        //SharedPreferences p = getPreferences(Context.MODE_PRIVATE);
+        //SharedPreferences.Editor editor = p.edit();
+        //editor.putInt(KEY_Mittelwertsumme, mittelwertsumme_shared);
+        //editor.putInt(KEY_kalibirieren, kalibrieren);
+        //editor.putInt(KEY_Offset, Offset_shared);
+        //editor.putString(KEY_Gesamt_be, Array_shared);
+        //editor.commit();
+    }
+
+    // KAMERA //
+    private void bindImageAnalysis(ProcessCameraProvider cameraProvider) {
+        ImageAnalysis.Builder builder = new ImageAnalysis.Builder();
+        builder.setTargetResolution(new Size(640, 480));
+        builder.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST);
+        ImageAnalysis imageAnalysis = builder.build();
+        imageAnalysis.setAnalyzer(
+                ContextCompat.getMainExecutor(this),
+                imageProxy -> {
+
+                    int imageFormat = imageProxy.getFormat();
+
+                    if (imageFormat == ImageFormat.YUV_420_888) {
+
+                        Image currentImage = imageProxy.getImage();
+
+                        if (previousHeight != 0) {
+                            assert currentImage != null;
+                            isMotionDetected = compareFrames(currentImage);
+                        }
+
+                        assert currentImage != null;
+                        Image.Plane[] planes = currentImage.getPlanes();
+                        ByteBuffer buffer = planes[0].getBuffer().duplicate();
+                        previousBuffer = ByteBuffer.allocateDirect(buffer.remaining());
+                        previousBuffer.put(buffer);
+                        previousWidth = currentImage.getWidth();
+                        previousHeight = currentImage.getHeight();
+
+                        currentImage.close();
+
+                        if (isMotionDetected) {
+                            alarm.setText("ALARM");
+                            camera_alarm = true;
+                        } else {
+                            camera_alarm = false;
+                            alarm.setText("OK");
+                        }
+
+                    }
+
+                    imageProxy.close();
+                });
+
+        // Preview preview = new Preview.Builder().build();
+
+        CameraSelector cameraSelector = new CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build();
+
+        // PREVIEW //
+        // preview.setSurfaceProvider(previewView.getSurfaceProvider());
+
+        cameraProvider.bindToLifecycle(this, cameraSelector, imageAnalysis);
+
+    }
+
+    // Bildverarbeitung zur Bewegungserkennung
+    private boolean compareFrames(Image currentImage) {
+
+        ByteBuffer currentBuffer = currentImage.getPlanes()[0].getBuffer();
+
+        int currentWidth = currentImage.getWidth();
+        int currentHeight = currentImage.getHeight();
+
+        if (previousWidth != currentWidth || previousHeight != currentHeight) {
+            return false;
+        }
+
+        for (int row = 0; row < previousHeight; row++) {
+            for (int col = 0; col < previousWidth; col++) {
+
+                int previousIndex = row * previousWidth + col;
+                int currentIndex = row * currentWidth + col;
+
+                int previousPixel = previousBuffer.get(previousIndex) & 0xFF;
+                int currentPixel = currentBuffer.get(currentIndex) & 0xFF;
+
+                int pixelDifference = Math.abs(previousPixel - currentPixel);
+                int threshold = 120;
+
+                if (pixelDifference > threshold) {
+                    // Testzwecke
+                    //String text = String.valueOf(pixelDifference);
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+}

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

 package com.example.greenwatch;
 
-import androidx.appcompat.app.AppCompatActivity;
-
+import android.content.Intent;
+import android.content.pm.PackageManager;
 import android.os.Bundle;
+import android.widget.Button;
+
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
 
 public class MainActivity extends AppCompatActivity {
+    private static final int RECHTEANFORDERUNG_KAMERA = 10;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+        Button kameraStarten = findViewById(R.id.button_camera);
+        kameraStarten.setOnClickListener(v -> {
+            if (istZugriffAufKameraErlaubt()) {
+                starteKameraAktivitaet();
+            } else {
+                zugriffAufKameraAnfordern();
+            }
+        });
+    }
+
+    private boolean istZugriffAufKameraErlaubt() {
+        return ContextCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED;
+    }
+
+    private void zugriffAufKameraAnfordern() {
+        ActivityCompat.requestPermissions(this,new String[]{android.Manifest.permission.CAMERA}, RECHTEANFORDERUNG_KAMERA);
+    }
+
+    private void starteKameraAktivitaet() {
+        startActivity(new Intent(this, KameraAktivitaet.class));
     }
 }

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

+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".Beschleunigungssensor">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical">
+
+        <TextView
+            android:id="@+id/DatenBsensor"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="" />
+
+        <TextView
+            android:id="@+id/WarnungBsensor"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="" />
+
+        <TextView
+            android:id="@+id/test"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="" />
+
+        <TextView
+            android:id="@+id/Alarm_Kamera"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="OK" />
+    </LinearLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/activity_demo_kamera2_nebenaktivitaet.xml

+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".KameraAktivitaet">
+
+    <FrameLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:id="@+id/erklaerung">
+
+        <Button
+            android:id="@+id/button2"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="Button" />
+
+        <androidx.camera.view.PreviewView
+            android:id="@+id/previewView"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent">
+
+        </androidx.camera.view.PreviewView>
+    </FrameLayout>
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical">
+
+        <TextView
+            android:id="@+id/alarm"
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1"
+            android:layout_gravity="center"
+            android:gravity="center"
+            android:text=""
+            android:textSize="100sp"
+            android:textColor="#9999ff"/>
+        <TextView
+            android:id="@+id/threshold_test"
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1"
+            android:layout_gravity="center"
+            android:gravity="center"
+            android:text=""
+            android:textSize="100sp"
+            android:textColor="#9999ff"/>
+    </LinearLayout>
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
+    <Button
+        android:id="@+id/button_camera"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Kamera starten"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.129"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.931" />
+
+    <TextView
+        android:id="@+id/textView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text=" "
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.498"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.247" />
+
     <TextView
+        android:id="@+id/textView2"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
+        android:text="TextView"
         app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="@+id/textView" />
+
 
 </androidx.constraintlayout.widget.ConstraintLayout>

build.gradle

 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 plugins {
-    id 'com.android.application' version '7.1.3' apply false
-    id 'com.android.library' version '7.1.3' apply false
+    id 'com.android.application' version '8.0.0' apply false
+    id 'com.android.library' version '8.0.0' apply false
 }
 
 task clean(type: Delete) {

gradle.properties

 # Enables namespacing of each library's R class so that its R class includes only the
 # resources declared in the library itself and none from the library's dependencies,
 # thereby reducing the size of the R class for that library
-android.nonTransitiveRClass=true
+android.nonTransitiveRClass=true
+android.defaults.buildfeatures.buildconfig=true
+android.nonFinalResIds=false

gradle/wrapper/gradle-wrapper.properties

 #Thu May 11 14:50:16 CEST 2023
 distributionBase=GRADLE_USER_HOME
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.0-bin.zip
 distributionPath=wrapper/dists
 zipStorePath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME