Refactor

# Conflicts:
#	app/src/main/java/com/example/ueberwachungssystem/MainActivity.java

app/build.gradle

@@ -42,6 +42,8 @@ dependencies {
     def opencv_version = "4.5.3.0"
     implementation "com.quickbirdstudios:opencv:${opencv_version}"
 
+    implementation "androidx.lifecycle:lifecycle-extensions:2.0.0"
+
 
     // Required for CameraX
     def camerax_version = "1.2.2"

app/src/main/AndroidManifest.xml

@@ -24,6 +24,7 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+    <service android:name=".Detection.DetectorService"/>
     </application>
 
 </manifest>

app/src/main/java/com/example/ueberwachungssystem/Detection/AudioRecorder.java

@@ -0,0 +1,74 @@
+package com.example.ueberwachungssystem.Detection;
+
+import android.content.Context;
+import android.media.MediaPlayer;
+import android.media.MediaRecorder;
+import android.widget.Toast;
+
+import java.io.File;
+import java.io.IOException;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
+public class AudioRecorder {
+    private final Context context;
+    private MediaRecorder mediaRecorder = null;
+    private boolean isRecording = false;
+    private File outputDir;      // Default: in app files directory
+
+
+    public AudioRecorder (Context context) {
+        this.context = context;
+        this.outputDir = context.getFilesDir();
+    }
+
+    public void startRecording() {
+        // Handle logic
+        if (outputDir == null)
+            return;
+        if (isRecording)
+            return;
+        isRecording = true;
+
+        // Setup Audio Recorder for output Format: 3GP
+        mediaRecorder = new MediaRecorder();
+        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
+        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
+        mediaRecorder.setOutputFile(outputDir + "/" + generateFileName() + ".3gp");
+        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
+        try {
+            mediaRecorder.prepare();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        mediaRecorder.start();
+    }
+
+    public void stopRecording() {
+        if (mediaRecorder != null) {
+            mediaRecorder.stop();
+            mediaRecorder.reset();
+            mediaRecorder.release();
+            mediaRecorder = null;
+            isRecording = false;
+            Toast.makeText(context, "audio recording saved", Toast.LENGTH_SHORT).show();
+        }
+    }
+
+    public boolean isRecording(){
+        return isRecording;
+    }
+
+    public void setOutputDir(File outputDir) {
+        this.outputDir = outputDir;
+    }
+
+    private String generateFileName(){
+        // Get the current timestamp
+        LocalDateTime currentTime = LocalDateTime.now();
+        // Define the format for the timestamp
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd_HHmmss");
+        // Return the timestamp as a string
+        return currentTime.format(formatter);
+    }
+}

app/src/main/java/com/example/ueberwachungssystem/Detection/Detector.java

@@ -3,6 +3,7 @@ package com.example.ueberwachungssystem.Detection;
 import android.os.CountDownTimer;
 
 import androidx.annotation.NonNull;
+import androidx.camera.core.ExperimentalGetImage;
 
 
 abstract public class Detector {
@@ -11,7 +12,7 @@ abstract public class Detector {
     private boolean extendViolation = false;
 
     // Countdown parameters
-    private final int COUNTDOWN_TIME = 5000;          // milliseconds
+    private final int COUNTDOWN_TIME = 10000;          // milliseconds
     private final int COUNTDOWN_POLLING_TIME = 100;   // milliseconds
 
     /** Constructor - takes context of current activity */

app/src/main/java/com/example/ueberwachungssystem/Detection/DetectorService.java

@@ -0,0 +1,160 @@
+package com.example.ueberwachungssystem.Detection;
+
+import android.content.Intent;
+import android.os.Binder;
+import android.os.IBinder;
+import android.widget.ImageView;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.camera.core.ExperimentalGetImage;
+import androidx.lifecycle.LifecycleService;
+
+import java.io.File;
+
+@ExperimentalGetImage
+public class DetectorService extends LifecycleService {
+    public ServiceBinder serviceBinder = new ServiceBinder();
+    private DetectorService.OnDetectionListener listener;
+    private boolean isServiceRunning = false;
+
+    VideoDetector videoDetector = null;
+    AudioRecorder audioRecorder = null;
+
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        if (isServiceRunning)
+            return START_NOT_STICKY;
+
+
+        // Setup Service classes:
+        videoDetector = new VideoDetector(this);
+        videoDetector.setOnDetectionListener(new Detector.OnDetectionListener() {
+            @Override
+            public void onDetection(@NonNull DetectionReport detectionReport) {
+                passToServiceListener(detectionReport);
+            }
+        });
+
+        audioRecorder = new AudioRecorder(this);
+
+
+
+        isServiceRunning = true;
+        return super.onStartCommand(intent, flags, startId);
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        isServiceRunning = false;
+    }
+
+    /** Service methods */
+    public class ServiceBinder extends Binder {
+        public DetectorService getBoundService() {
+            // Return an instance of the TestService
+            return DetectorService.this;
+        }
+    }
+    @Nullable
+    @Override
+    public IBinder onBind(Intent intent) {
+        super.onBind(intent);
+        return serviceBinder;
+    }
+
+
+    /** Video Detection */
+    public void startVideoDetection() {
+        if(videoDetector != null)
+            videoDetector.startDetection();
+    }
+    public void stopVideoDetection() {
+        if(videoDetector != null)
+            videoDetector.stopDetection();
+    }
+    public boolean isVideoDetectionRunning() {
+        if(videoDetector != null)
+           return videoDetector.isDetecting();
+        return false;
+    }
+    public void debugVideoProcessing(ImageView input, ImageView output) {
+        if(videoDetector != null)
+            videoDetector.debugProcessing(input, output);
+    }
+
+    /** Audio Detection */
+    public void startAudioDetection() {
+
+    }
+    public void stopAudioDetection() {
+
+    }
+
+    /** Motion Detection */
+    public void startMotionDetection() {
+
+    }
+    public void stopMotionDetection() {
+
+    }
+
+    /** Video Recording */
+    public void startVideoRecording() {
+        if(videoDetector != null)
+            videoDetector.startRecording();
+    }
+    public void stopVideoRecording() {
+        if(videoDetector != null)
+            videoDetector.stopRecording();
+    }
+    public boolean isVideoRecordingRunning() {
+        if(videoDetector != null)
+            return videoDetector.isRecording();
+        return false;
+    }
+    public void setVideoRecordingDir(File outputDir) {
+        if (videoDetector != null)
+            videoDetector.setOutputDir(outputDir);
+    }
+
+    /** Audio Recording */
+    public void startAudioRecording() {
+        if(audioRecorder != null)
+            audioRecorder.startRecording();
+    }
+    public void stopAudioRecording() {
+        if(audioRecorder != null)
+            audioRecorder.stopRecording();
+    }
+    public boolean isAudioRecordingRunning() {
+        if(videoDetector != null)
+            return audioRecorder.isRecording();
+        return false;
+    }
+    public void setAudioRecordingDir(File outputDir) {
+        if (audioRecorder != null)
+            audioRecorder.setOutputDir(outputDir);
+    }
+
+
+
+
+    /** pass Detection Report to Service Detection Listener and trigger it */
+    public void passToServiceListener(DetectionReport detectionReport) {
+        if (listener != null) {
+            listener.onDetection(detectionReport);
+        }
+    }
+
+
+    /** On Detection Listener - runs when violation is reported */
+    public interface OnDetectionListener {
+        void onDetection(@NonNull DetectionReport detectionReport);
+    }
+    public void setOnDetectionListener(@NonNull DetectorService.OnDetectionListener listener) {
+        this.listener = listener;
+    }
+}

app/src/main/java/com/example/ueberwachungssystem/Detection/OpenCVHelper.java

@@ -0,0 +1,109 @@
+package com.example.ueberwachungssystem.Detection;
+
+import android.graphics.Bitmap;
+import android.media.Image;
+import android.widget.ImageView;
+
+import androidx.annotation.NonNull;
+import androidx.camera.core.ExperimentalGetImage;
+import androidx.camera.core.ImageProxy;
+
+import org.opencv.android.Utils;
+import org.opencv.core.Core;
+import org.opencv.core.CvType;
+import org.opencv.core.Mat;
+import org.opencv.core.MatOfPoint;
+import org.opencv.core.Scalar;
+import org.opencv.core.Size;
+import org.opencv.imgproc.Imgproc;
+
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+
+@ExperimentalGetImage
+public class OpenCVHelper {
+
+    /** OpenCV helper methods **/
+    public static Mat addGaussianBlur(Mat inputMat, Size kernelSize){
+        Mat outputMat = new Mat();
+        Imgproc.GaussianBlur(inputMat, outputMat, kernelSize, 0);
+        return outputMat;
+    }
+
+    public static Mat addBlur(Mat inputMat, Size kernelSize){
+        Mat outputMat = new Mat();
+        Imgproc.blur(inputMat, outputMat, kernelSize);
+        return outputMat;
+    }
+
+    public static Mat extractYChannel(@NonNull ImageProxy imgProxy) {
+        Image img = imgProxy.getImage();
+
+        assert img != null;
+        ByteBuffer yBuffer = img.getPlanes()[0].getBuffer();
+        byte[] yData = new byte[yBuffer.remaining()];
+        yBuffer.get(yData);
+
+        Mat yMat = new Mat(img.getHeight(), img.getWidth(), CvType.CV_8UC1);
+        yMat.put(0, 0, yData);
+
+        return yMat;
+    }
+
+    public static Mat thresholdPixels(Mat inputMat, Mat previousImage, int threshold){
+        Mat diffImage = new Mat();
+        Core.absdiff(inputMat, previousImage, diffImage);
+        Mat binaryMat = new Mat();
+        Imgproc.threshold(diffImage, binaryMat, threshold, 255, Imgproc.THRESH_BINARY);
+        return binaryMat;
+    }
+
+
+    public static Mat thresholdContourArea(Mat inputMat, float areaThreshold){
+        List<MatOfPoint> contours = new ArrayList<>();
+        Mat hierarchy = new Mat();
+        Imgproc.findContours(inputMat, contours, hierarchy, Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);
+
+        Mat outputMat = new Mat(inputMat.size(), inputMat.type(), new Scalar(0));
+        // Iterate over the contours and draw only the larger contours on the outputMat
+        for (MatOfPoint contour : contours) {
+            double contourArea = Imgproc.contourArea(contour);
+            if (contourArea > areaThreshold) {
+                Imgproc.drawContours(outputMat, Collections.singletonList(contour), 0, new Scalar(255), -1);
+            }
+        }
+        // Apply the outputMat as a mask to the dilatedImage
+        Mat maskedImage = new Mat();
+        inputMat.copyTo(maskedImage, outputMat);
+        return outputMat;
+    }
+
+    public static Mat dilateBinaryMat(Mat inputMat, Size kernelSize){
+        Mat dilatedMat = new Mat();
+        Mat kernel = Imgproc.getStructuringElement(Imgproc.MORPH_ELLIPSE, kernelSize);
+        Imgproc.dilate(inputMat, dilatedMat, kernel);
+        return dilatedMat;
+    }
+
+    public static int countNonZeroPixels(Mat inputImage) {
+        if (inputImage != null)
+            return Core.countNonZero(inputImage);
+        else
+            return 0;
+    }
+
+
+    public static void debugMat(Mat mat, ImageView imageView) {
+        if (imageView == null || mat == null)
+            return;
+
+        Bitmap bitmap = Bitmap.createBitmap(mat.cols(), mat.rows(), Bitmap.Config.ARGB_8888);
+        Utils.matToBitmap(mat, bitmap);
+
+        // Display the bitmap in an ImageView
+        imageView.setImageBitmap(bitmap);
+    }
+}

app/src/main/java/com/example/ueberwachungssystem/Detection/VideoDetector.java

@@ -2,15 +2,15 @@ package com.example.ueberwachungssystem.Detection;
 
 import android.Manifest;
 import android.annotation.SuppressLint;
-import android.app.Activity;
 import android.content.Context;
 import android.content.pm.PackageManager;
-import android.graphics.Bitmap;
 import android.graphics.ImageFormat;
 import android.media.Image;
 import android.os.CountDownTimer;
 import android.util.Log;
+import android.view.Display;
 import android.view.Surface;
+import android.view.WindowManager;
 import android.widget.ImageView;
 import android.widget.Toast;
 
@@ -31,20 +31,12 @@ import androidx.lifecycle.LifecycleOwner;
 import com.google.common.util.concurrent.ListenableFuture;
 
 import org.opencv.android.OpenCVLoader;
-import org.opencv.android.Utils;
-import org.opencv.core.Core;
-import org.opencv.core.CvType;
 import org.opencv.core.Mat;
-import org.opencv.core.MatOfPoint;
-import org.opencv.core.Scalar;
 import org.opencv.core.Size;
-import org.opencv.imgproc.Imgproc;
 
 import java.io.File;
-import java.nio.ByteBuffer;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
 import java.util.concurrent.ExecutionException;
 
 
@@ -57,18 +49,14 @@ import java.util.concurrent.ExecutionException;
 
 @ExperimentalGetImage
 public class VideoDetector extends Detector {
-
     // Calling Activity
     private final Context context;
 
-    // Permission handling
-    private static final int PERMISSION_REQUEST_CODE = 3691;
-
     // Camera Provider
     private ProcessCameraProvider cameraProvider;
-    private final ImageAnalysis imageAnalysis;
-    private final VideoCapture videoCapture;
-    private final Preview preview;
+    private ImageAnalysis imageAnalysis;
+    private VideoCapture videoCapture;
+    //private Preview preview;
 
     // Logic
     private boolean isDetecting = false;
@@ -82,23 +70,18 @@ public class VideoDetector extends Detector {
     private ImageView inputImageView = null;
     private ImageView outputImageView = null;
 
-
-    // Recording
-    private final String outputName = "video.mp4";
+    // Recorder
+    private File outputDir;      // Default: in app files directory
 
 
     // Parameters
-    private static final float ALARM_THRESHOLD = 0.5f;   // Percent of pixels changed
-    private static final long START_DELAY = 20000;   // milliseconds
+    private static final float ALARM_THRESHOLD = 0f;   // Percent of pixels changed
+    private static final float AREA_THRESHOLD = 10f;
+    private static final int DILATE_ITERATIONS = 2;
+    private static final float START_DELAY = 20000;   // milliseconds
     private static final android.util.Size IMAGE_RES = new android.util.Size(640, 480);
 
 
-    private enum UseCase {
-        ImageAnalysis,
-        Preview,
-        VideoCapture
-    };
-
 
     /** Constructor */
     public VideoDetector(Context context) {
@@ -106,13 +89,17 @@ public class VideoDetector extends Detector {
         this.context = context;
         this.imageAnalysis = setupImageAnalysis();
         this.videoCapture = setupVideoCapture();
-        this.preview = new Preview.Builder().build();
+        this.outputDir = context.getFilesDir();
+        //this.preview = new Preview.Builder().build();
     }
 
-    /** Get State of the Detector */
-    public boolean isRunning() {
+    /** Get States */
+    public boolean isDetecting() {
         return isDetecting;
     }
+    public boolean isRecording(){
+        return isRecording;
+    }
 
 
     /** Starts the Video Detection */
@@ -121,11 +108,8 @@ public class VideoDetector extends Detector {
         // Check States
         if (isDetecting)
             return;
-        // Return On Request Permissions
-        if (!hasPermissions()) {
-            getPermissions();
-            return;
-        }
+        // Configure Image Analysis
+        imageAnalysis = setupImageAnalysis();
         // Open CV startup check
         if (!OpenCVLoader.initDebug()) {
             Log.e("OpenCV", "Unable to load OpenCV!");
@@ -138,11 +122,52 @@ public class VideoDetector extends Detector {
             try {
                 cameraProvider = cameraProviderFuture.get();
                 isDetecting = true;
-                bindCameraProvider(UseCase.ImageAnalysis);
+                bindCameraProvider();
             } catch (ExecutionException | InterruptedException e) {}
         }, ContextCompat.getMainExecutor(context));
+        // Disable Violation Calling for Setup Time
+        startViolationTimer(START_DELAY);
+    }
 
-        startViolationTimer();
+    /** Starts the Recorder */
+    @SuppressLint("RestrictedApi")
+    public void startRecording() {
+        // Check States
+        if (isRecording){
+            return;
+        }
+
+        videoCapture = setupVideoCapture();
+
+        final ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(context);
+        cameraProviderFuture.addListener(() -> {
+            try {
+                cameraProvider = cameraProviderFuture.get();
+                isRecording = true;
+                bindCameraProvider();
+
+                File vidFile = new File(context.getFilesDir() + "/" + generateFileName() + ".mp4");
+                if (ActivityCompat.checkSelfPermission(context, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
+                    return;
+                }
+                videoCapture.startRecording(
+                        new VideoCapture.OutputFileOptions.Builder(vidFile).build(),
+                        context.getMainExecutor(),
+                        new VideoCapture.OnVideoSavedCallback() {
+                            @Override
+                            public void onVideoSaved(@NonNull VideoCapture.OutputFileResults outputFileResults) {
+                                isRecording = false;
+                                Toast.makeText(context, "video recording saved", Toast.LENGTH_SHORT).show();
+                            }
+                            @Override
+                            public void onError(int videoCaptureError, @NonNull String message, @Nullable Throwable cause) {
+                                isRecording = false;
+                                Toast.makeText(context, "video recording failed", Toast.LENGTH_SHORT).show();
+                            }
+                        }
+                );
+            } catch (ExecutionException | InterruptedException ignored) {}
+        }, ContextCompat.getMainExecutor(context));
     }
 
     /** Stops the Video Detection */
@@ -155,29 +180,136 @@ public class VideoDetector extends Detector {
         allowReportViolation = false;
     }
 
-    /** Permission handling */
-    private boolean hasPermissions() {
-        return ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED &&
-                ContextCompat.checkSelfPermission(context, Manifest.permission.RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED;
-    }
-    private void getPermissions() {
-        if (!hasPermissions())
-            ActivityCompat.requestPermissions((Activity) context, new String[]{android.Manifest.permission.CAMERA, Manifest.permission.RECORD_AUDIO}, PERMISSION_REQUEST_CODE);
+    /** Stops the Recording */
+    @SuppressLint("RestrictedApi")
+    public void stopRecording(){
+        if(!isRecording)
+            return;
+
+        videoCapture.stopRecording();
+        cameraProvider.unbind(videoCapture);
+        isRecording = false;
     }
 
-
-
-    /** Binds the Luminosity Analyzer (configure and run Analysis) */
-    private void bindCameraProvider(UseCase useCase) {
+    /** Bind Camera Provider */
+    private void bindCameraProvider() {
         // Specify which Camera to use
         CameraSelector cameraSelector = new CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build();
         cameraProvider.unbindAll();
         cameraProvider.bindToLifecycle((LifecycleOwner) context, cameraSelector, imageAnalysis, videoCapture);
     }
 
+    /** Setup Use Cases */
+    private ImageAnalysis setupImageAnalysis() {
+        // Configure and create Image Analysis
+        ImageAnalysis.Builder builder = new ImageAnalysis.Builder();
+        builder.setTargetResolution(IMAGE_RES);
+        builder.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST);
+        builder.setOutputImageFormat(ImageAnalysis.OUTPUT_IMAGE_FORMAT_YUV_420_888);
+        builder.setTargetRotation(Surface.ROTATION_90);
+        ImageAnalysis imageAnalysis = builder.build();
+        // Set Analyzer
+        imageAnalysis.setAnalyzer(ContextCompat.getMainExecutor(context), imageProxy -> {
+            if (imageProxy.getFormat() == ImageFormat.YUV_420_888) {
+                Image image = imageProxy.getImage();
+                assert image != null;
+
+                // Violation Handling
+                Mat processed = processImage(imageProxy);
+
+                int n = OpenCVHelper.countNonZeroPixels(processed);
+                int pixelCount = image.getWidth() * image.getHeight();
+                float percentChanged = (float) n / pixelCount;
+
+                // Violation Condition
+                if (percentChanged * 100 > ALARM_THRESHOLD) {
+                    if (allowReportViolation)
+                        reportViolation("Video", percentChanged);
+                }
+            }
+            imageProxy.close();
+        });
+        return imageAnalysis;
+    }
+
+    @SuppressLint("RestrictedApi")
+    private VideoCapture setupVideoCapture() {
+        int rotation = getDisplayRotation();
+        return new VideoCapture.Builder()
+                .setTargetRotation(rotation)
+                .build();
+    }
+
+    /** Process Image to be used for Motion Detection */
+    private Mat processImage(ImageProxy imageProxy){
+        if (imageProxy == null)
+            return null;
+        // Image Transformation
+        Mat imageMat = OpenCVHelper.extractYChannel(imageProxy);
+        // Show Input Image
+        if (inputImageView != null)
+            OpenCVHelper.debugMat(imageMat, inputImageView);
+        // Preprocess Image
+        Mat preprocessed = imageMat;
+        preprocessed = OpenCVHelper.addGaussianBlur(preprocessed, new Size(21, 21));
+        preprocessed = OpenCVHelper.addBlur(preprocessed, new Size(3, 3));
+        // Set Previous Image
+        if (previousImage == null) {
+            previousImage = preprocessed;
+            return null;
+        }
+        // Process Image
+        Mat processed = preprocessed.clone();
+        processed = OpenCVHelper.thresholdPixels(processed, previousImage, 25);
+
+        for(int i = 0; i < DILATE_ITERATIONS; i++)
+            processed = OpenCVHelper.dilateBinaryMat(processed, new Size(3,3));
+
+        processed = OpenCVHelper.thresholdContourArea(processed, AREA_THRESHOLD);
+        // Output
+        previousImage = preprocessed.clone();
+        // Show Output Image
+        if (outputImageView != null)
+            OpenCVHelper.debugMat(processed, outputImageView);
+        return processed;
+    }
+
+
+    /** Debug input and result of processing */
+    public void debugProcessing(@NonNull ImageView inputImageView, @NonNull ImageView outputImageView){
+        this.inputImageView = inputImageView;
+        this.outputImageView = outputImageView;
+    }
+
+    /**
+    private void setPreviewView(@NonNull PreviewView previewView) {
+        // Create Preview
+        if (this.preview != null)
+            this.preview.setSurfaceProvider(previewView.getSurfaceProvider());
+    }
+     */
+
+
+    /** Generate File Name */
+    private String generateFileName(){
+        // Get the current timestamp
+        LocalDateTime currentTime = LocalDateTime.now();
+        // Define the format for the timestamp
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd_HHmmss");
+        // Return the timestamp as a string
+        return currentTime.format(formatter);
+    }
+
+
+    /** Get current Display Rotation */
+    private int getDisplayRotation() {
+        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
+        Display display = windowManager.getDefaultDisplay();
+        return display.getRotation();
+    }
 
     /** Start delay until Violation Report is allowed */
-    private void startViolationTimer() {
+    private void startViolationTimer(float setupTime) {
         new CountDownTimer((long) (START_DELAY), 100) {
             @Override
             public void onTick(long millisUntilFinished) {
@@ -189,253 +321,7 @@ public class VideoDetector extends Detector {
         }.start();
     }
 
-
-    private ImageAnalysis setupImageAnalysis() {
-        // Configure and create Image Analysis
-        ImageAnalysis.Builder builder = new ImageAnalysis.Builder();
-        builder.setTargetResolution(IMAGE_RES);
-        builder.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST);
-        builder.setOutputImageFormat(ImageAnalysis.OUTPUT_IMAGE_FORMAT_YUV_420_888);
-        ImageAnalysis imageAnalysis = builder.build();
-        // Set Analyzer
-        imageAnalysis.setAnalyzer(ContextCompat.getMainExecutor(context), imageProxy -> {
-            if (imageProxy.getFormat() == ImageFormat.YUV_420_888) {
-                Image image = imageProxy.getImage();
-                assert image != null;
-
-                // Violation Handling
-                Mat processed = processImage(imageProxy);
-                int n = OpenCVHelper.countNonZeroPixels(processed);
-                int pixelCount = image.getWidth() * image.getHeight();
-                float percentChanged = (float) n / pixelCount;
-
-                // Violation Condition
-                if (percentChanged * 100 > ALARM_THRESHOLD) {
-                    if (allowReportViolation)
-                        reportViolation("Video", n);
-                }
-            }
-            imageProxy.close();
-        });
-        return imageAnalysis;
-    }
-
-    @SuppressLint("RestrictedApi")
-    private VideoCapture setupVideoCapture() {
-        return new VideoCapture.Builder()
-                .setTargetRotation(Surface.ROTATION_0)
-                .build();
-    }
-
-    @SuppressLint("RestrictedApi")
-    public void startRecording() {
-        // Check States
-        if (isRecording){
-            extendViolation();
-            return;
-        }
-
-        // Return On Request Permissions
-        if (!hasPermissions()) {
-            getPermissions();
-            return;
-        }
-
-        final ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(context);
-        cameraProviderFuture.addListener(() -> {
-            try {
-                cameraProvider = cameraProviderFuture.get();
-                isRecording = true;
-                bindCameraProvider(UseCase.VideoCapture);
-
-                File vidFile = new File(context.getFilesDir() + "/" + outputName);
-                if (ActivityCompat.checkSelfPermission(context, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
-                    return;
-                }
-                videoCapture.startRecording(
-                        new VideoCapture.OutputFileOptions.Builder(vidFile).build(),
-                        context.getMainExecutor(),
-                        new VideoCapture.OnVideoSavedCallback() {
-                            @Override
-                            public void onVideoSaved(@NonNull VideoCapture.OutputFileResults outputFileResults) {
-                                isRecording = false;
-                                Toast.makeText(context, "recording saved", Toast.LENGTH_SHORT).show();
-                            }
-                            @Override
-                            public void onError(int videoCaptureError, @NonNull String message, @Nullable Throwable cause) {
-                                isRecording = false;
-                                Toast.makeText(context, "recording failed", Toast.LENGTH_SHORT).show();
-                            }
-                        }
-                );
-            } catch (ExecutionException | InterruptedException e) {}
-        }, ContextCompat.getMainExecutor(context));
-    }
-
-    @SuppressLint("RestrictedApi")
-    public void stopRecording(){
-        videoCapture.stopRecording();
-        cameraProvider.unbind(videoCapture);
-        isRecording = false;
-    }
-
-    /** Process Image to be used for Motion Detection */
-    private Mat processImage(ImageProxy imageProxy){
-        if (imageProxy == null)
-            return null;
-
-        // Image Transformation
-        Mat imageMat = OpenCVHelper.extractYChannel(imageProxy);
-
-        // Show Input Image
-        if (inputImageView != null)
-            OpenCVHelper.debugMat(imageMat, inputImageView);
-
-        // Preprocess Image
-        Mat preprocessed = imageMat;
-        preprocessed = OpenCVHelper.addGaussianBlur(preprocessed, new Size(21, 21));
-        preprocessed = OpenCVHelper.addBlur(preprocessed, new Size(3, 3));
-
-        if (previousImage == null) {
-            previousImage = preprocessed;
-            return null;
-        }
-
-        // Process Image
-        Mat processed = preprocessed.clone();
-        processed = OpenCVHelper.thresholdPixels(processed, previousImage, 25);
-        processed = OpenCVHelper.dilateBinaryMat(processed, new Size(3,3));
-        processed = OpenCVHelper.dilateBinaryMat(processed, new Size(3,3));
-        processed = OpenCVHelper.thresholdContourArea(processed, 500);
-
-        // Output
-        previousImage = preprocessed.clone();
-        // Show Output Image
-        if (outputImageView != null)
-            OpenCVHelper.debugMat(processed, outputImageView);
-        return processed;
-    }
-
-    public void debugProcessing(@NonNull ImageView inputImageView, @NonNull ImageView outputImageView){
-        this.inputImageView = inputImageView;
-        this.outputImageView = outputImageView;
-    }
-
-    public void setPreviewView(@NonNull PreviewView previewView) {
-        // Create Preview
-        if (this.preview != null)
-            this.preview.setSurfaceProvider(previewView.getSurfaceProvider());
-    }
-
-
-
-    private static class OpenCVHelper{
-        private OpenCVHelper() {}
-
-        /** OpenCV helper methods **/
-        private static Mat addGaussianBlur(Mat inputMat, Size kernelSize){
-            Mat outputMat = new Mat();
-            Imgproc.GaussianBlur(inputMat, outputMat, kernelSize, 0);
-            return outputMat;
-        }
-
-        private static Mat addBlur(Mat inputMat, Size kernelSize){
-            Mat outputMat = new Mat();
-            Imgproc.blur(inputMat, outputMat, kernelSize);
-            return outputMat;
-        }
-
-        private static Mat extractYChannel(@NonNull ImageProxy imgProxy) {
-            Image img = imgProxy.getImage();
-
-            assert img != null;
-            ByteBuffer yBuffer = img.getPlanes()[0].getBuffer();
-            byte[] yData = new byte[yBuffer.remaining()];
-            yBuffer.get(yData);
-
-            Mat yMat = new Mat(img.getHeight(), img.getWidth(), CvType.CV_8UC1);
-            yMat.put(0, 0, yData);
-
-            return yMat;
-        }
-
-        private static Mat thresholdPixels(Mat inputMat, Mat previousImage, int threshold){
-            Mat diffImage = new Mat();
-            Core.absdiff(inputMat, previousImage, diffImage);
-            Mat binaryMat = new Mat();
-            Imgproc.threshold(diffImage, binaryMat, threshold, 255, Imgproc.THRESH_BINARY);
-            return binaryMat;
-        }
-
-        private static Mat imageProxyToGrayscaleMat(ImageProxy imageProxy) {
-            // Step 1: Extract the image data from ImageProxy
-            ImageProxy.PlaneProxy[] planes = imageProxy.getPlanes();
-            ByteBuffer yBuffer = planes[0].getBuffer();
-            byte[] yData = new byte[yBuffer.remaining()];
-            yBuffer.get(yData);
-
-            // Step 2: Convert the image data to NV21 format
-            int width = imageProxy.getWidth();
-            int height = imageProxy.getHeight();
-            byte[] nv21Data = new byte[width * height * 3 / 2];
-            // Assuming the image format is YUV_420_888
-            System.arraycopy(yData, 0, nv21Data, 0, yData.length);
-            for (int i = yData.length; i < nv21Data.length; i += 2) {
-                nv21Data[i] = yData[i + 1];
-                nv21Data[i + 1] = yData[i];
-            }
-
-            // Step 3: Create a grayscale Mat from the NV21 data
-            Mat grayscaleMat = new Mat(height, width, CvType.CV_8UC1);
-            grayscaleMat.put(0, 0, nv21Data);
-
-            return grayscaleMat;
-        }
-
-
-        private static Mat thresholdContourArea(Mat inputMat, float areaThreshold){
-            List<MatOfPoint> contours = new ArrayList<>();
-            Mat hierarchy = new Mat();
-            Imgproc.findContours(inputMat, contours, hierarchy, Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);
-
-            Mat outputMat = new Mat(inputMat.size(), inputMat.type(), new Scalar(0));
-            // Iterate over the contours and draw only the larger contours on the outputMat
-            for (MatOfPoint contour : contours) {
-                double contourArea = Imgproc.contourArea(contour);
-                if (contourArea > areaThreshold) {
-                    Imgproc.drawContours(outputMat, Collections.singletonList(contour), 0, new Scalar(255), -1);
-                }
-            }
-            // Apply the outputMat as a mask to the dilatedImage
-            Mat maskedImage = new Mat();
-            inputMat.copyTo(maskedImage, outputMat);
-            return outputMat;
-        }
-
-        private static Mat dilateBinaryMat(Mat inputMat, Size kernelSize){
-            Mat dilatedMat = new Mat();
-            Mat kernel = Imgproc.getStructuringElement(Imgproc.MORPH_ELLIPSE, kernelSize);
-            Imgproc.dilate(inputMat, dilatedMat, kernel);
-            return dilatedMat;
-        }
-
-        private static int countNonZeroPixels(Mat inputImage) {
-            if (inputImage != null)
-                return Core.countNonZero(inputImage);
-            else
-                return 0;
-        }
-
-
-        private static void debugMat(Mat mat, ImageView imageView) {
-            if (imageView == null || mat == null)
-                return;
-
-            Bitmap bitmap = Bitmap.createBitmap(mat.cols(), mat.rows(), Bitmap.Config.ARGB_8888);
-            Utils.matToBitmap(mat, bitmap);
-
-            // Display the bitmap in an ImageView
-            imageView.setImageBitmap(bitmap);
-        }
+    public void setOutputDir(File outputDir) {
+        this.outputDir = outputDir;
     }
 }

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

@@ -11,6 +11,7 @@ import android.view.View;
 import android.widget.ImageView;
 import android.widget.ToggleButton;
 
+import com.example.ueberwachungssystem.Detection.AudioRecorder;
 import com.example.ueberwachungssystem.Detection.DetectionReport;
 import com.example.ueberwachungssystem.Detection.Detector;
 import com.example.ueberwachungssystem.Detection.VideoDetector;
@@ -29,33 +30,50 @@ public class MainActivity extends AppCompatActivity {
         PreviewView previewView = findViewById(R.id.previewView);
 
 
-        VideoDetector vd = new VideoDetector(this);
-        //vd.setPreviewView(previewView);
-        vd.debugProcessing(inputImageView, outputImageView);
-        vd.setOnDetectionListener(new Detector.OnDetectionListener() {
-            @Override
-            public void onDetection(@NonNull DetectionReport detectionReport) {
-                Log.d("onDetection", detectionReport.toString());
-            }
-        });
-        vd.startDetection();
+        PermissionHandler permissionHandler = new PermissionHandler(this);
 
 
+        permissionHandler.getPermissions();
 
-        ToggleButton toggleButton = findViewById(R.id.toggleButton);
-        toggleButton.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                if (toggleButton.isChecked())
-                {
-                    //vd.startDetection();
-                    vd.startRecording();
+        if (permissionHandler.hasPermissions()) {
+            AudioRecorder audioRecorder = new AudioRecorder(this);
+            VideoDetector vd = new VideoDetector(this);
+            //vd.setPreviewView(previewView);
+            vd.debugProcessing(inputImageView, outputImageView);
+            vd.setOnDetectionListener(new Detector.OnDetectionListener() {
+                @Override
+                public void onDetection(@NonNull DetectionReport detectionReport) {
+                    Log.d("onDetection", detectionReport.toString());
                 }
-                else {
-                    //vd.stopDetection();
-                    vd.stopRecording();
+            });
+            vd.startDetection();
+
+            ToggleButton toggleButton = findViewById(R.id.toggleButton);
+            toggleButton.setOnClickListener(new View.OnClickListener() {
+                @Override
+                public void onClick(View v) {
+                    if (toggleButton.isChecked())
+                    {
+                        //vd.startDetection();
+                        //vd.stopDetection();
+                        vd.startRecording();
+                        audioRecorder.startRecording();
+                    }
+                    else {
+                        //vd.stopDetection();
+                        vd.stopRecording();
+                        audioRecorder.stopRecording();
+                    }
                 }
-            }
-        });
+            });
+
+
+
+
+
+
+
+        }
+
     }
 }

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

@@ -0,0 +1,43 @@
+package com.example.ueberwachungssystem;
+
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.widget.Toast;
+
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
+
+public class PermissionHandler {
+    private final Context context;
+    private static final int PERMISSION_REQUEST_CODE = 23409;
+    private static final String[] permissions = new String[]{
+            android.Manifest.permission.CAMERA,
+            android.Manifest.permission.RECORD_AUDIO
+    };
+
+    public PermissionHandler(Context context) {
+        this.context = context;
+    }
+
+    public boolean hasPermissions() {
+        boolean permissionState = true;
+        for (String permission: permissions) {
+            permissionState = permissionState && ContextCompat.checkSelfPermission(context, permission) == PackageManager.PERMISSION_GRANTED;
+        }
+        return permissionState;
+    }
+
+    public void getPermissions() {
+        if (!hasPermissions())
+            ActivityCompat.requestPermissions((Activity) context, permissions, PERMISSION_REQUEST_CODE);
+    }
+
+    public void showPermissionToast() {
+        if (hasPermissions())
+            Toast.makeText(context, "permissions available", Toast.LENGTH_SHORT).show();
+        else
+            Toast.makeText(context, "permissions missing", Toast.LENGTH_SHORT).show();
+    }
+}

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

@@ -24,15 +24,18 @@
 
     <ImageView
         android:id="@+id/inputImageView"
-        android:layout_width="match_parent"
+        android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         tools:srcCompat="@tools:sample/avatars" />
 
     <ImageView
         android:id="@+id/outputImageView"
-        android:layout_width="match_parent"
+        android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         tools:srcCompat="@tools:sample/avatars" />
 
+    <androidx.camera.view.PreviewView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
 
 </LinearLayout>