added AlarmRecording

app/src/main/AndroidManifest.xml

     package="com.example.greenwatch">
 
     <uses-permission android:name="android.permission.INTERNET" />
-    <uses-permission android:name="android.permission.CAMERA"/>
-    <uses-permission android:name="android.permission.RECORD_AUDIO" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.READ_MEDIA_AUDIO" />
+    <uses-permission android:name="android.permission.READ_MEDIA_VIDEO" />
+    <uses-permission android:name="android.permission.RECORD_AUDIO" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
+    <uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />
 
     <uses-feature android:name="android.hardware.camera"/>
 

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

 import android.hardware.SensorEventListener;
 import android.hardware.SensorManager;
 import android.os.Bundle;
+import android.view.SurfaceView;
 import android.view.View;
 import android.widget.Button;
 import android.widget.TextView;
 
     private SensorManager accelerometerManager;
     private Sensor accelerometerSensor;
+    private SurfaceView surfaceView;
     private TextView accelerometerStatusMessage;
     private TextView accelerometerDataTV;
     private TextView tvAccelerometerdeviceListRecyclerView;
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_accelerometer);
 
+        surfaceView = (SurfaceView) findViewById(R.id.surfaceViewAccelerometer);
         accelerometerStatusMessage = (TextView) findViewById(R.id.tvAccelerometerStatusmessage);
         accelerometerDataTV = (TextView) findViewById(R.id.tvAccelerometerData);
         tvAccelerometerdeviceListRecyclerView = (TextView) findViewById(R.id.tvAccelerometerdeviceListRecyclerView);
         });
 
         mAccelerometerViewModel = new ViewModelProvider(this).get(AccelerometerViewModel.class);
-        mAccelerometerViewModel.init();
+        mAccelerometerViewModel.init(surfaceView.getHolder());
         mAccelerometerViewModel.getConnectedDeviceList().observe(this, new Observer<List<Device>>() {
             @Override
             public void onChanged(List<Device> devices) {
                 if (aBoolean) {
                     if(permission.alarmRechtePruefen(AccelerometerActivity.this, AccelerometerActivity.this)){
                         Toast.makeText(AccelerometerActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                        mAccelerometerViewModel.startAlarmRecording();
                         //todo AlarmHandling einfügen
-                    } else {
+                    }
+                    else {
                         permission.alarmRechteAnfordern(AccelerometerActivity.this);
                         if(permission.alarmRechtePruefen(AccelerometerActivity.this, AccelerometerActivity.this)){
                             Toast.makeText(AccelerometerActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                            mAccelerometerViewModel.startAlarmRecording();
                             //todo Alarmhandling einfügen
-                        } else {
+                        }
+                        else {
                             Toast.makeText(AccelerometerActivity.this, "Stop Alarm Recording", Toast.LENGTH_LONG).show();
+                            mAccelerometerViewModel.stopAlarmRecording(AccelerometerActivity.this);
                         }
                     }
                 }
                 else {
+                    mAccelerometerViewModel.stopAlarmRecording(AccelerometerActivity.this);
                     Toast.makeText(AccelerometerActivity.this, "Stop Alarm Recording", Toast.LENGTH_LONG).show();
                 }
             }

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

 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 
-import android.hardware.SensorManager;
 import android.os.Bundle;
+import android.view.SurfaceView;
 import android.view.View;
 import android.widget.Button;
 import android.widget.TextView;
 import com.example.greenwatch.adapters.AlarmHistoryListAdapter;
 import com.example.greenwatch.adapters.DeviceListAdapter;
 import com.example.greenwatch.models.Device;
-import com.example.greenwatch.viewmodels.AccelerometerViewModel;
 import com.example.greenwatch.viewmodels.MicrofonViewModel;
 
 import java.util.List;
     private TextView tvAAudiodetectionAlarmHistoryListRecyclerView;
     private TextView tvAudiodetectionDeviceListRecyclerView;
     private Button backToMainActivityButton;
+    private SurfaceView surfaceView;
     private Permission permission = new Permission();
     private MicrofonViewModel mMicrofonViewModel;
 
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_audiodetection);
 
+        surfaceView = (SurfaceView) findViewById(R.id.surfaceViewAudio);
         microfonStatusMessage = (TextView) findViewById(R.id.tvAudiodetectionStatusmessage);
         tvAAudiodetectionAlarmHistoryListRecyclerView = (TextView) findViewById(R.id.tvAudiodetectionAlarmHistoryListRecyclerView);
         tvAudiodetectionDeviceListRecyclerView = (TextView) findViewById(R.id.tvAudiodetectionDeviceListRecyclerView);
         });
 
         mMicrofonViewModel = new ViewModelProvider(this).get(MicrofonViewModel.class);
-        mMicrofonViewModel.init();
+        mMicrofonViewModel.init(surfaceView.getHolder());
         mMicrofonViewModel.getConnectedDeviceList().observe(this, new Observer<List<Device>>() {
             @Override
             public void onChanged(List<Device> devices) {
                 if (aBoolean) {
                     if(permission.alarmRechtePruefen(AudiodetectionActivity.this, AudiodetectionActivity.this)){
                         Toast.makeText(AudiodetectionActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                        mMicrofonViewModel.startAlarmRecording();
                         //todo AlarmHandling einfügen
                     } else {
                         permission.alarmRechteAnfordern(AudiodetectionActivity.this);
                         if(permission.alarmRechtePruefen(AudiodetectionActivity.this, AudiodetectionActivity.this)){
                             Toast.makeText(AudiodetectionActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                            mMicrofonViewModel.startAlarmRecording();
                             //todo Alarmhandling einfügen
                         } else {
                             Toast.makeText(AudiodetectionActivity.this, "Stop Alarm Recording", Toast.LENGTH_LONG).show();
+                            mMicrofonViewModel.stopAlarmRecording(AudiodetectionActivity.this);
                         }
                     }
                 }
                 else {
                     Toast.makeText(AudiodetectionActivity.this, "Stop Alarm Recording", Toast.LENGTH_LONG).show();
+                    mMicrofonViewModel.stopAlarmRecording(AudiodetectionActivity.this);
                 }
             }
         });

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

 import android.hardware.SensorEventListener;
 import android.hardware.SensorManager;
 import android.os.Bundle;
+import android.view.SurfaceView;
 import android.view.View;
 import android.widget.Button;
 import android.widget.TextView;
 import com.example.greenwatch.adapters.DeviceListAdapter;
 import com.example.greenwatch.models.Device;
 import com.example.greenwatch.viewmodels.AudiodetectionAndAccelerometerViewModel;
-import com.example.greenwatch.viewmodels.VideodetectionAndAccelerometerViewModel;
 
 import java.util.List;
 
 public class AudiodetectionAndAccelerometerActivity extends AppCompatActivity implements SensorEventListener {
     private SensorManager accelerometerManager;
     private Sensor accelerometerSensor;
+    private SurfaceView surfaceView;
     private TextView audiodetectionAndAccelerometerStatusMessage;
     private TextView tvAudiodetectionAndAccelerometerDeviceListRecyclerView;
     private TextView tvAudiodetectionAndAccelerometerAlarmHistoryListRecyclerView;
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_audiodetection_and_accelerometer);
 
+        surfaceView = (SurfaceView) findViewById(R.id.surfaceViewAudiodetectionAndAccelerometer);
         audiodetectionAndAccelerometerStatusMessage = (TextView) findViewById(R.id.tvAudiodetectionAndAccelerometerStatusmessage);
         tvAudiodetectionAndAccelerometerDeviceListRecyclerView = (TextView) findViewById(R.id.tvAudiodetectionAndAccelerometerDeviceListRecyclerView);
         tvAudiodetectionAndAccelerometerAlarmHistoryListRecyclerView = (TextView) findViewById(R.id.tvAudiodetectionAndAccelerometerAlarmHistoryListRecyclerView);
         });
 
         mAudiodetectionAndAccelerometerViewModel = new ViewModelProvider(this).get(AudiodetectionAndAccelerometerViewModel.class);
-        mAudiodetectionAndAccelerometerViewModel.init();
+        mAudiodetectionAndAccelerometerViewModel.init(surfaceView.getHolder());
         mAudiodetectionAndAccelerometerViewModel.getConnectedDeviceList().observe(this, new Observer<List<Device>>() {
             @Override
             public void onChanged(List<Device> devices) {
                 if (aBoolean) {
                     if(permission.alarmRechtePruefen(AudiodetectionAndAccelerometerActivity.this, AudiodetectionAndAccelerometerActivity.this)){
                         Toast.makeText(AudiodetectionAndAccelerometerActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                        mAudiodetectionAndAccelerometerViewModel.startAlarmRecording();
                         //todo AlarmHandling einfügen
                     } else {
                         permission.alarmRechteAnfordern(AudiodetectionAndAccelerometerActivity.this);
                         if(permission.alarmRechtePruefen(AudiodetectionAndAccelerometerActivity.this, AudiodetectionAndAccelerometerActivity.this)){
                             Toast.makeText(AudiodetectionAndAccelerometerActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                            mAudiodetectionAndAccelerometerViewModel.startAlarmRecording();
                             //todo Alarmhandling einfügen
                         } else {
                             Toast.makeText(AudiodetectionAndAccelerometerActivity.this, "Stop Alarm Recording", Toast.LENGTH_LONG).show();
+                            mAudiodetectionAndAccelerometerViewModel.stopAlarmRecording(AudiodetectionAndAccelerometerActivity.this);
                         }
                     }
                 }
                 else {
                     Toast.makeText(AudiodetectionAndAccelerometerActivity.this, "Stop Alarm Recording", Toast.LENGTH_LONG).show();
+                    mAudiodetectionAndAccelerometerViewModel.stopAlarmRecording(AudiodetectionAndAccelerometerActivity.this);
                 }
             }
         });

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

 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
-import android.hardware.SensorManager;
 import android.os.Bundle;
+import android.view.SurfaceView;
 import android.view.View;
 import android.widget.Button;
+import android.widget.TextView;
 import android.widget.Toast;
 
 import com.example.greenwatch.adapters.AlarmHistoryListAdapter;
 import com.example.greenwatch.models.Device;
 import com.example.greenwatch.viewmodels.MainActivityViewModel;
 
-
 import java.util.List;
 
 public class MainActivity extends AppCompatActivity {
         permission.startRechtePruefen(this, this);
 
         mMainActivityViewModel = new ViewModelProvider(this).get(MainActivityViewModel.class);
-        mMainActivityViewModel.init();
+        mMainActivityViewModel.init(surfaceView.getHolder());
+
         mMainActivityViewModel.getConnectedDeviceList().observe(this, new Observer<List<Device>>() {
             @Override
             public void onChanged(List<Device> devices) {
                 if (aBoolean) {
                     if(permission.alarmRechtePruefen(context, activity)){
                         Toast.makeText(MainActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                        mMainActivityViewModel.startAlarmRecording();
                         //todo AlarmHandling einfügen
                     } else {
                         permission.alarmRechteAnfordern(activity);
                         if(permission.alarmRechtePruefen(context, activity)){
                             Toast.makeText(MainActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                            mMainActivityViewModel.startAlarmRecording();
                             //todo Alarmhandling einfügen
                         } else {
                             Toast.makeText(MainActivity.this, "Stop Alarm Recording", Toast.LENGTH_LONG).show();
+                            mMainActivityViewModel.stopAlarmRecording(MainActivity.this);
                         }
                     }
                 }
         Intent intent = new Intent(this, VideodetectionAndAccelerometerActivity.class);
         startActivity(intent);
     }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+    }
 }

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

 import androidx.recyclerview.widget.RecyclerView;
 
 import android.os.Bundle;
+import android.view.SurfaceView;
 import android.view.View;
 import android.widget.Button;
+import android.widget.TextView;
 import android.widget.Toast;
 
 import com.example.greenwatch.adapters.AlarmHistoryListAdapter;
 import com.example.greenwatch.adapters.DeviceListAdapter;
 import com.example.greenwatch.models.Device;
-import com.example.greenwatch.viewmodels.AccelerometerViewModel;
 import com.example.greenwatch.viewmodels.VideodetectionViewModel;
 import com.google.common.util.concurrent.ListenableFuture;
 
         });
 
         mVideoDetectionViewModel = new ViewModelProvider(this).get(VideodetectionViewModel.class);
-        mVideoDetectionViewModel.init();
+        mVideoDetectionViewModel.init(surfaceView.getHolder());
         mVideoDetectionViewModel.getConnectedDeviceList().observe(this, new Observer<List<Device>>() {
             @Override
             public void onChanged(List<Device> devices) {
                 if (aBoolean) {
                     if(permission.alarmRechtePruefen(VideodetectionActivity.this, VideodetectionActivity.this)){
                         Toast.makeText(VideodetectionActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                        mVideoDetectionViewModel.startAlarmRecording();
                         //todo AlarmHandling einfügen
                     } else {
                         permission.alarmRechteAnfordern(VideodetectionActivity.this);
                         if(permission.alarmRechtePruefen(VideodetectionActivity.this, VideodetectionActivity.this)){
                             Toast.makeText(VideodetectionActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                            mVideoDetectionViewModel.startAlarmRecording();
                             //todo Alarmhandling einfügen
                         } else {
                             Toast.makeText(VideodetectionActivity.this, "Stop Alarm Recording", Toast.LENGTH_LONG).show();
+                            mVideoDetectionViewModel.stopAlarmRecording(VideodetectionActivity.this);
                         }
                     }
                 }

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

 import android.hardware.SensorEventListener;
 import android.hardware.SensorManager;
 import android.os.Bundle;
+import android.view.SurfaceView;
 import android.view.View;
 import android.widget.Button;
 import android.widget.TextView;
 public class VideodetectionAndAccelerometerActivity extends AppCompatActivity implements SensorEventListener {
     private SensorManager accelerometerManager;
     private Sensor accelerometerSensor;
+    private SurfaceView surfaceView;
     private TextView videodetectionAndAccelerometerStatusMessage;
     private TextView videodetectionAndAccelerometerDataTV;
     private TextView tvVideodetectionAndAccelerometerDeviceListRecyclerView;
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_videodetection_and_accelerometer);
 
+        surfaceView = (SurfaceView) findViewById(R.id.surfaceViewVideodetectionAndAccelerometer);
         videodetectionAndAccelerometerStatusMessage = (TextView) findViewById(R.id.tvvideodetectionAndAccelerometerStatusmessage);
         videodetectionAndAccelerometerDataTV = (TextView) findViewById(R.id.tvvideodetectionAndAccelerometerData);
         tvVideodetectionAndAccelerometerDeviceListRecyclerView = (TextView) findViewById(R.id.tvVideodetectionAndAccelerometerDeviceListRecyclerView);
         });
 
         mVideodetectionAndAccelerometerViewModel = new ViewModelProvider(this).get(VideodetectionAndAccelerometerViewModel.class);
-        mVideodetectionAndAccelerometerViewModel.init();
+        mVideodetectionAndAccelerometerViewModel.init(surfaceView.getHolder());
         mVideodetectionAndAccelerometerViewModel.getConnectedDeviceList().observe(this, new Observer<List<Device>>() {
             @Override
             public void onChanged(List<Device> devices) {
                 if (aBoolean) {
                     if(permission.alarmRechtePruefen(VideodetectionAndAccelerometerActivity.this, VideodetectionAndAccelerometerActivity.this)){
                         Toast.makeText(VideodetectionAndAccelerometerActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                        mVideodetectionAndAccelerometerViewModel.startAlarmRecording();
                         //todo AlarmHandling einfügen
                     } else {
                         permission.alarmRechteAnfordern(VideodetectionAndAccelerometerActivity.this);
                         if(permission.alarmRechtePruefen(VideodetectionAndAccelerometerActivity.this, VideodetectionAndAccelerometerActivity.this)){
                             Toast.makeText(VideodetectionAndAccelerometerActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                            mVideodetectionAndAccelerometerViewModel.startAlarmRecording();
                             //todo Alarmhandling einfügen
                         } else {
                             Toast.makeText(VideodetectionAndAccelerometerActivity.this, "Stop Alarm Recording", Toast.LENGTH_LONG).show();
+                            mVideodetectionAndAccelerometerViewModel.stopAlarmRecording(VideodetectionAndAccelerometerActivity.this);
                         }
                     }
                 }
                 else {
                     Toast.makeText(VideodetectionAndAccelerometerActivity.this, "Stop Alarm Recording", Toast.LENGTH_LONG).show();
+                    mVideodetectionAndAccelerometerViewModel.stopAlarmRecording(VideodetectionAndAccelerometerActivity.this);
                 }
             }
         });

app/src/main/java/com/example/greenwatch/alarmrecorder/AlarmRecorder.java

+package com.example.greenwatch.alarmrecorder;
+
+import android.app.Activity;
+import android.content.Context;
+import android.media.MediaCodec;
+import android.media.MediaExtractor;
+import android.media.MediaFormat;
+import android.media.MediaMuxer;
+import android.media.MediaRecorder;
+import android.os.Environment;
+import android.view.SurfaceHolder;
+import android.widget.Toast;
+
+import com.example.greenwatch.MainActivity;
+import com.example.greenwatch.alarmrecorder.runnables.AudioRecorder;
+import com.example.greenwatch.alarmrecorder.runnables.VideoRecorder;
+import com.example.greenwatch.sensors.AccelerometerSensor;
+import com.example.greenwatch.sensors.CameraSensor;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+public class AlarmRecorder {
+    private static AlarmRecorder alarmRecorderInstance;
+    private boolean isRecording;
+    private String videoPath;
+    private String audioPath;
+    private MediaFormat videoFormat;
+    private MediaFormat audioFormat;
+    private MediaExtractor videoExtractor;
+    private MediaExtractor audioExtractor;
+    private AudioRecorder audioRecorderRunnable;
+    private VideoRecorder videoRecorderRunnable;
+    private SurfaceHolder previewHolder;
+    private MediaRecorder videoRecorder;
+    //private MediaRecorder audioRecorder;
+    private Thread videoThread; // Video-Thread als Instanzvariable
+    private Thread audioThread; // Audio-Thread als Instanzvariable
+
+    private AlarmRecorder() {
+        //audioRecorder = new MediaRecorder();
+        //videoRecorder = new MediaRecorder();
+        videoExtractor = new MediaExtractor();
+        audioExtractor = new MediaExtractor();
+        audioRecorderRunnable = new AudioRecorder();
+        videoRecorderRunnable = new VideoRecorder();
+    }
+
+    public static synchronized AlarmRecorder getInstance() {
+        if (alarmRecorderInstance == null){
+            alarmRecorderInstance = new AlarmRecorder();
+        }
+        return alarmRecorderInstance;
+    }
+
+    public void setPreviewHolder(SurfaceHolder previewHolder) {
+        this.previewHolder = previewHolder;
+    }
+
+    public void startRecording() {
+        createStoragePaths(); //Speicherort und -namen für Audio- und Video-Datei
+
+        setAudioPath(audioPath);
+        setVideoPath(videoPath);
+        setVideoRecorderPreviewHolder(previewHolder);
+
+        audioThread = new Thread(audioRecorderRunnable);
+        videoThread = new Thread(videoRecorderRunnable);
+
+        //Threads starten
+        videoThread.start();
+        audioThread.start();
+    }
+
+    public void stopRecording(Context context) {
+        try {
+            stopAudioRecording();
+            stopVideoRecording();
+
+            Toast.makeText(context, "Video- und Audioaufzeichnung beendet", Toast.LENGTH_SHORT).show();
+
+            waitTillThreadsStopped();
+            File videoFile = new File(videoPath); //Speichere das aufgenommene Video
+            File audioFile = new File(audioPath); //Speichere die aufgenommene Audio
+
+            if (videoFile.exists() && audioFile.exists()) {
+                //Wenn Video- und Audioaufzeichnung gestoppt und abgespeichert sind, beginne mit dem Mergeprozess der beiden
+                mergeVideoWithAudio();
+                Toast.makeText(context, "Video und Audio erfolgreich zusammengeführt", Toast.LENGTH_SHORT).show();
+            } else {
+                Toast.makeText(context, "Dateien wurden nicht gefunden!", Toast.LENGTH_SHORT).show();
+            }
+        } catch (RuntimeException stopException) {
+            stopException.printStackTrace();
+        }
+    }
+
+    private void createStoragePaths(){
+        //Pfade zum Zwischenspeichern der aufgenommenen Audio und Video-Datei
+        String externalStorageDirectory = Environment.getExternalStorageDirectory().getAbsolutePath();
+        String dcimDirectory = externalStorageDirectory + "/DCIM";
+        videoPath = dcimDirectory + "/video.mp4";
+        audioPath = dcimDirectory + "/audio.mp3";
+    }
+
+    private void setVideoPath(String videoPath) {
+        videoRecorderRunnable.setVideoPath(videoPath);
+    }
+
+    private void setVideoRecorderPreviewHolder(SurfaceHolder previewHolder) {
+        videoRecorderRunnable.setPreviewHolder(previewHolder);
+    }
+    private void stopVideoRecording(){
+        videoRecorderRunnable.stopVideoRecording();
+    }
+
+    private void setAudioPath(String audioPath) {
+        audioRecorderRunnable.setAudioPath(audioPath);
+    }
+
+    private void stopAudioRecording(){
+        audioRecorderRunnable.stopAudioRecording();
+    }
+
+    private void waitTillThreadsStopped(){
+        try {
+            videoThread.join();
+            audioThread.join();
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private void mergeVideoWithAudio() {
+        try {
+            setVideoExtractorDataSource(); //extrahieren der Video Datei, die zuvor zwischengespeichert wurde
+            setAudioExtractorDataSource(); //extrahieren der Audio Datei, die zuvor zwischengespeichert wurde
+
+            //Speicherort der später zusammengeführten Datei
+            String outputFilePath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES).getAbsolutePath() + "/merged_video.mp4";
+            //MediaMuxer zum Zusammenführen einer Audio- und einer Videodatei
+            MediaMuxer muxer = new MediaMuxer(outputFilePath, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
+            int videoTrack = muxer.addTrack(videoFormat);
+            int audioTrack = muxer.addTrack(audioFormat);
+            muxer.start();
+
+            ByteBuffer buffer = ByteBuffer.allocate(1024 * 1024);
+            MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
+
+            videoExtraction(buffer, videoTrack, bufferInfo, muxer);
+            audioExtraction(buffer, audioTrack, bufferInfo, muxer);
+
+            muxer.stop();
+            muxer.release();
+
+            // Löschen der separaten Video- und Audio-Dateien
+            deleteVideoFile();
+            deleteAudioFile();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private void setVideoExtractorDataSource() {
+        try {
+            videoExtractor.setDataSource(videoPath);
+            int videoTrackIndex = getTrackIndex(videoExtractor, "video/");
+            if (videoTrackIndex < 0) {
+                // Video-Track nicht gefunden
+                return;
+            }
+            videoExtractor.selectTrack(videoTrackIndex);
+            videoFormat = videoExtractor.getTrackFormat(videoTrackIndex);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private void setAudioExtractorDataSource() {
+        try {
+            audioExtractor.setDataSource(audioPath);
+            int audioTrackIndex = getTrackIndex(audioExtractor, "audio/");
+            if (audioTrackIndex < 0) {
+                // Audio-Track nicht gefunden
+                return;
+            }
+            audioExtractor.selectTrack(audioTrackIndex);
+            audioFormat = audioExtractor.getTrackFormat(audioTrackIndex);
+
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private int getTrackIndex(MediaExtractor extractor, String mimeType) {
+        int trackCount = extractor.getTrackCount();
+        for (int i = 0; i < trackCount; i++) {
+            MediaFormat format = extractor.getTrackFormat(i);
+            String trackMimeType = format.getString(MediaFormat.KEY_MIME);
+            if (trackMimeType.startsWith(mimeType)) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
+    private void videoExtraction(ByteBuffer buffer, int videoTrack, MediaCodec.BufferInfo bufferInfo, MediaMuxer muxer) {
+        videoExtractor.seekTo(0, MediaExtractor.SEEK_TO_CLOSEST_SYNC);
+        while (true) {
+            int sampleSize = videoExtractor.readSampleData(buffer, 0);
+            if (sampleSize < 0) {
+                break;
+            }
+            long presentationTimeUs = videoExtractor.getSampleTime();
+            bufferInfo.offset = 0;
+            bufferInfo.size = sampleSize;
+            bufferInfo.flags = MediaCodec.BUFFER_FLAG_KEY_FRAME;
+            bufferInfo.presentationTimeUs = presentationTimeUs;
+            muxer.writeSampleData(videoTrack, buffer, bufferInfo);
+            videoExtractor.advance();
+        }
+    }
+
+    private void audioExtraction(ByteBuffer buffer, int audioTrack, MediaCodec.BufferInfo bufferInfo, MediaMuxer muxer) {
+        audioExtractor.seekTo(0, MediaExtractor.SEEK_TO_CLOSEST_SYNC);
+        while (true) {
+            int sampleSize = audioExtractor.readSampleData(buffer, 0);
+            if (sampleSize < 0) {
+                break;
+            }
+            long presentationTimeUs = audioExtractor.getSampleTime();
+            bufferInfo.offset = 0;
+            bufferInfo.size = sampleSize;
+            bufferInfo.flags = 0; // or MediaCodec.BUFFER_FLAG_KEY_FRAME
+            bufferInfo.presentationTimeUs = presentationTimeUs;
+            muxer.writeSampleData(audioTrack, buffer, bufferInfo);
+            audioExtractor.advance();
+        }
+    }
+
+
+    private void deleteVideoFile(){
+        File videoFile = new File(videoPath);
+        if (videoFile.exists()) {
+            videoFile.delete();
+        }
+    }
+
+    private void deleteAudioFile(){
+        File audioFile = new File(audioPath);
+        if (audioFile.exists()) {
+            audioFile.delete();
+        }
+    }
+}

app/src/main/java/com/example/greenwatch/alarmrecorder/runnables/AudioRecorder.java

+package com.example.greenwatch.alarmrecorder.runnables;
+
+import android.media.MediaRecorder;
+import android.view.SurfaceHolder;
+import android.widget.Toast;
+
+import com.example.greenwatch.MainActivity;
+
+import java.io.IOException;
+
+public class AudioRecorder implements Runnable {
+
+    private MediaRecorder audioRecorder = null;
+    private String audioPath;
+    public AudioRecorder() {
+    }
+
+    public void setAudioPath(String audioPath) {
+        this.audioPath = audioPath;
+    }
+
+    public void stopAudioRecording(){
+        if (audioRecorder != null) {
+            audioRecorder.stop();
+            audioRecorder.reset();
+            audioRecorder.release();
+            audioRecorder = null;
+        }
+    }
+
+    @Override
+    public void run() {
+        audioRecorder = new MediaRecorder();
+        audioRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
+        audioRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
+        audioRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
+        audioRecorder.setOutputFile(audioPath);
+
+        try {
+            audioRecorder.prepare();
+            audioRecorder.start();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

app/src/main/java/com/example/greenwatch/alarmrecorder/runnables/VideoRecorder.java

+package com.example.greenwatch.alarmrecorder.runnables;
+
+import android.media.MediaRecorder;
+import android.view.SurfaceHolder;
+
+import com.example.greenwatch.viewmodels.ViewModelInterface;
+
+import java.io.IOException;
+
+public class VideoRecorder implements Runnable{
+    private MediaRecorder videoRecorder;
+    private String videoPath;
+    private SurfaceHolder previewHolder;
+
+    public VideoRecorder() {
+        videoRecorder = new MediaRecorder();
+    }
+
+    public void setPreviewHolder(SurfaceHolder previewHolder) {
+        this.previewHolder = previewHolder;
+    }
+
+    public void setVideoPath(String audioPath) {
+        this.videoPath = audioPath;
+    }
+
+    public void stopVideoRecording(){
+        if (videoRecorder != null) {
+            videoRecorder.stop();
+            videoRecorder.reset();
+            videoRecorder.release();
+            videoRecorder = null;
+        }
+    }
+
+    @Override
+    public void run() {
+        videoRecorder = new MediaRecorder();
+        videoRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
+        videoRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
+        videoRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);
+        videoRecorder.setOutputFile(videoPath);
+        videoRecorder.setOrientationHint(90);
+        videoRecorder.setPreviewDisplay(previewHolder.getSurface());
+
+        try {
+            videoRecorder.prepare();
+            videoRecorder.start();
+
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

app/src/main/java/com/example/greenwatch/communication/WiFiCommunication.java

     private final InetAddress address;
     private final DatagramSocket socket;
     private final int port;
-    private String rxString;
+    private volatile String rxString;
     private String sendMessage;
     //private String sendMsg = "default";
     private boolean isNewMessage;
     }
 
     public void setDeviceRepository(DeviceRepository deviceRepository) {
-        this.mDeviceRepository = deviceRepository;
+        if (mDeviceRepository == null) {
+            this.mDeviceRepository = deviceRepository;
+        }
+
+    }
+    public void setRecievedSting(String rxString) {
+        this.rxString = rxString;
+        mDeviceRepository.getNewReceivedMessage(this.rxString);
     }
 
     public void setNewMessage(String newMessage, boolean isNewMessage){
                     rxString = new String(packet.getData(), 0, packet.getLength());
 
                     if(!previousRxString.equals(rxString)){
-                        mDeviceRepository.getNewReceivedMessage(rxString);
+                        setRecievedSting(rxString);
 
                     }
                     previousRxString = rxString;

app/src/main/java/com/example/greenwatch/repositories/DeviceRepository.java

     }
 
     public void setWiFiCommunication(WiFiCommunication wiFiCommunication) {
-        this.mWiFiCommunication = wiFiCommunication;
+        if (mWiFiCommunication == null) {
+            this.mWiFiCommunication = wiFiCommunication;
+        }
+
     }
 
     public MutableLiveData<List<Device>> getConnectedDeviceList() {
 
     public void getNewReceivedMessage(String newMessage) {
         String[] messageString = messageStringSplitter(newMessage);
-        if(messageString[0]=="1" && messageString.length == 7) {
+        if(messageString[0].equals("1") && messageString.length == 7) {
             String timeStamp = messageString[1];
             String deviceID = messageString[3];
-            boolean sensorStatus = convertSensorStatus(messageString[4]);
+            boolean sensorStatus = convertRecievedSensorStatus(messageString[4]);
             String sensorType = messageString[5];
             float sensorMassage = Float.valueOf(messageString[6]);
 
                     .append(delimiter)
                     .append(device.getDeviceID())
                     .append(delimiter)
-                    .append(device.getSensorStatus())
+                    .append(convertSendSensorStatus(device.getSensorStatus()))
                     .append(delimiter)
                     .append(device.getSensorType())
                     .append(delimiter)
         return message.split(delimiter);
     }
 
-    private boolean convertSensorStatus(String status) {
+    private boolean convertRecievedSensorStatus(String status) {
         return status.equals(sensorStatusKey);
     }
 
+    private String convertSendSensorStatus(boolean status) {
+        if (status){
+            return "An";
+        }
+        else {
+            return "Aus";
+        }
+    }
+
     private void setAlarmHistoryDeviceList(Device device) {
         if (alarmHistoryDeviceList.size() == maxAlarmHistoryListSize) {
             alarmHistoryDeviceList.remove(alarmHistoryDeviceList.size() -1);

app/src/main/java/com/example/greenwatch/viewmodels/AccelerometerViewModel.java

 package com.example.greenwatch.viewmodels;
 
+import android.Manifest;
+import android.app.Activity;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.view.SurfaceHolder;
+
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
 import androidx.lifecycle.LiveData;
 import androidx.lifecycle.MutableLiveData;
 import androidx.lifecycle.ViewModel;
 
+import com.example.greenwatch.alarmrecorder.AlarmRecorder;
 import com.example.greenwatch.models.Device;
 import com.example.greenwatch.repositories.DeviceRepository;
 import com.example.greenwatch.sensors.AccelerometerSensor;
     private MutableLiveData<List<Device>> mAlarmHistoryList;
     private MutableLiveData<Boolean> mStartAlarmRecording;
     private AccelerometerSensor mAccelerometerSensor;
+    private AlarmRecorder mAlarmRecorder;
     private DeviceRepository mDeviceRepository;
 
     @Override
-    public void init() {
+    public void init(SurfaceHolder previewHolder) {
         if (mDeviceRepository == null) {
             mDeviceRepository = DeviceRepository.getInstance();
         }
         if (mAccelerometerSensor == null) {
             mAccelerometerSensor = AccelerometerSensor.getInstance();
         }
+        if (mAlarmRecorder == null) {
+            mAlarmRecorder = AlarmRecorder.getInstance();
+        }
         if (mDeviceList == null) {
             mDeviceList = mDeviceRepository.getConnectedDeviceList();
         }
         if (mAccelerometerAlarmDetected == null) {
             mAccelerometerAlarmDetected = mAccelerometerSensor.getAccelerometerAlarmDetected();
         }
+        setAlarmRecordingPreviewHolder(previewHolder);
     }
 
     public void addValueToGesamtBE(float newValue) {
     public String getSystemTimeStamp() {
         return mDeviceRepository.getSystemTimeStamp();
     }
+
+    @Override
+    public void startAlarmRecording() {
+        mAlarmRecorder.startRecording();
+    }
+
+    @Override
+    public void stopAlarmRecording(Context context) {
+        mAlarmRecorder.stopRecording(context);
+    }
+
+    @Override
+    public void setAlarmRecordingPreviewHolder(SurfaceHolder previewHolder) {
+        mAlarmRecorder.setPreviewHolder(previewHolder);
+    }
 }

app/src/main/java/com/example/greenwatch/viewmodels/AudiodetectionAndAccelerometerViewModel.java

 package com.example.greenwatch.viewmodels;
 
+import android.content.Context;
+import android.view.SurfaceHolder;
+
 import androidx.lifecycle.LiveData;
 import androidx.lifecycle.MutableLiveData;
 import androidx.lifecycle.Observer;
 import androidx.lifecycle.ViewModel;
 
+import com.example.greenwatch.alarmrecorder.AlarmRecorder;
 import com.example.greenwatch.models.Device;
 import com.example.greenwatch.repositories.DeviceRepository;
 import com.example.greenwatch.sensors.AccelerometerSensor;
     private MutableLiveData<Boolean> mStartAlarmRecording;
     private AccelerometerSensor mAccelerometerSensor;
     private MicrofonSensor mMicrofonSensor;
+    private AlarmRecorder mAlarmRecorder;
     private DeviceRepository mDeviceRepository;
     private boolean microfonAlarmDetected;
     private boolean accelerometerAlarmDetected;
     private boolean microfondetectionAndAccelerometerAlarmDetected;
 
-    @Override
     public void init() {
-        if (mDeviceRepository == null) {
-            mDeviceRepository = DeviceRepository.getInstance();
-        }
-        if (mAccelerometerSensor == null) {
-            mAccelerometerSensor = AccelerometerSensor.getInstance();
-        }
-        if (mMicrofonSensor == null) {
-            mMicrofonSensor = MicrofonSensor.getInstance();
-        }
-        if (mDeviceList == null) {
-            mDeviceList = mDeviceRepository.getConnectedDeviceList();
-        }
-        if (mAlarmHistoryList == null) {
-            mAlarmHistoryList = mDeviceRepository.getAlarmHistoryDeviceList();
-        }
-        if (mStartAlarmRecording == null) {
-            mStartAlarmRecording = mDeviceRepository.getStartAlarmRecording();
-        }
-        if (mAccelerometerAlarmDetected == null) {
-            mAccelerometerAlarmDetected = mAccelerometerSensor.getAccelerometerAlarmDetected();
-        }
-        if (mMicrofonAlarmDetected == null) {
-            mMicrofonAlarmDetected = mMicrofonSensor.getAccelerometerAlarmDetected();
-        }
-        microfondetectionAndAccelerometerAlarmDetected = false;
-        accelerometerAlarmDetected = false;
-        microfonAlarmDetected = false;
-        registerAlarmObserver();
+
     }
 
     public void addValueToGesamtBE(float newValue) {
         mAccelerometerAlarmDetected.removeObserver(observer);
     }
 
+    @Override
+    public void init(SurfaceHolder previewHolder) {
+        if (mDeviceRepository == null) {
+            mDeviceRepository = DeviceRepository.getInstance();
+        }
+        if (mAccelerometerSensor == null) {
+            mAccelerometerSensor = AccelerometerSensor.getInstance();
+        }
+        if (mMicrofonSensor == null) {
+            mMicrofonSensor = MicrofonSensor.getInstance();
+        }
+        if (mAlarmRecorder == null) {
+            mAlarmRecorder = AlarmRecorder.getInstance();
+        }
+        if (mDeviceList == null) {
+            mDeviceList = mDeviceRepository.getConnectedDeviceList();
+        }
+        if (mAlarmHistoryList == null) {
+            mAlarmHistoryList = mDeviceRepository.getAlarmHistoryDeviceList();
+        }
+        if (mStartAlarmRecording == null) {
+            mStartAlarmRecording = mDeviceRepository.getStartAlarmRecording();
+        }
+        if (mAccelerometerAlarmDetected == null) {
+            mAccelerometerAlarmDetected = mAccelerometerSensor.getAccelerometerAlarmDetected();
+        }
+        if (mMicrofonAlarmDetected == null) {
+            mMicrofonAlarmDetected = mMicrofonSensor.getAccelerometerAlarmDetected();
+        }
+        microfondetectionAndAccelerometerAlarmDetected = false;
+        accelerometerAlarmDetected = false;
+        microfonAlarmDetected = false;
+        registerAlarmObserver();
+        setAlarmRecordingPreviewHolder(previewHolder);
+    }
+
     @Override
     public LiveData<List<Device>> getConnectedDeviceList() {
         return mDeviceList;
     public String getSystemTimeStamp() {
         return mDeviceRepository.getSystemTimeStamp();
     }
+
+    @Override
+    public void startAlarmRecording() {
+        mAlarmRecorder.startRecording();
+    }
+
+    @Override
+    public void stopAlarmRecording(Context context) {
+        mAlarmRecorder.stopRecording(context);
+    }
+
+    @Override
+    public void setAlarmRecordingPreviewHolder(SurfaceHolder previewHolder) {
+        mAlarmRecorder.setPreviewHolder(previewHolder);
+    }
 }

app/src/main/java/com/example/greenwatch/viewmodels/MainActivityViewModel.java

 import android.app.Activity;
 import android.content.Context;
 import android.content.pm.PackageManager;
+import android.view.SurfaceHolder;
 
 import androidx.core.app.ActivityCompat;
 import androidx.core.content.ContextCompat;
 import androidx.lifecycle.MutableLiveData;
 import androidx.lifecycle.ViewModel;
 
+import com.example.greenwatch.alarmrecorder.AlarmRecorder;
 import com.example.greenwatch.communication.WiFiCommunication;
 import com.example.greenwatch.models.Device;
 import com.example.greenwatch.repositories.DeviceRepository;
+import com.example.greenwatch.sensors.AccelerometerSensor;
 
 import java.util.List;
 
     private MutableLiveData<List<Device>> mAlarmHistoryList;
     private MutableLiveData<Boolean> mStartAlarmRecording;
     private DeviceRepository mDeviceRepository;
+    private WiFiCommunication mWiFiCommunication;
+    private AlarmRecorder mAlarmRecorder;
 
     @Override
-    public void init() {
-        WiFiCommunication mWiFiCommunication;
-        if(mDeviceList != null) {
-            return;
+    public void init(SurfaceHolder previewHolder) {
+
+        if (mDeviceRepository == null) {
+            mDeviceRepository = DeviceRepository.getInstance();
+        }
+        if (mWiFiCommunication == null) {
+            mWiFiCommunication = WiFiCommunication.getInstance();
+        }
+        if (mAlarmRecorder == null) {
+            mAlarmRecorder = AlarmRecorder.getInstance();
+        }
+        if (mDeviceList == null) {
+            mDeviceList = mDeviceRepository.getConnectedDeviceList();
+        }
+        if (mAlarmHistoryList == null) {
+            mAlarmHistoryList = mDeviceRepository.getAlarmHistoryDeviceList();
+        }
+        if (mStartAlarmRecording == null) {
+            mStartAlarmRecording = mDeviceRepository.getStartAlarmRecording();
         }
-        mDeviceRepository = DeviceRepository.getInstance();
-        mWiFiCommunication = WiFiCommunication.getInstance();
-        mDeviceRepository.setWiFiCommunication(mWiFiCommunication);
         mWiFiCommunication.setDeviceRepository(mDeviceRepository);
+        mDeviceRepository.setWiFiCommunication(mWiFiCommunication);
         mDeviceRepository.createNewDevice(mDeviceRepository.getSystemTimeStamp(), mDeviceRepository.getLocalDeviceUUID(), false, "No Sensor selected", 0.0f);
         mDeviceRepository.setDeviceID(mDeviceRepository.getLocalDeviceUUID(), WiFiCommunication.getLocalIpAddress());
-        mDeviceList = mDeviceRepository.getConnectedDeviceList();
-        mAlarmHistoryList = mDeviceRepository.getAlarmHistoryDeviceList();
-        mStartAlarmRecording = mDeviceRepository.getStartAlarmRecording();
+        setAlarmRecordingPreviewHolder(previewHolder);
+        mWiFiCommunication = null;
     }
 
     @Override
     public String getSystemTimeStamp() {
         return mDeviceRepository.getSystemTimeStamp();
     }
+
+    @Override
+    public void startAlarmRecording() {
+        mAlarmRecorder.startRecording();
+    }
+
+    @Override
+    public void stopAlarmRecording(Context context) {
+        mAlarmRecorder.stopRecording(context);
+    }
+
+    @Override
+    public void setAlarmRecordingPreviewHolder(SurfaceHolder previewHolder) {
+        mAlarmRecorder.setPreviewHolder(previewHolder);
+    }
 }

app/src/main/java/com/example/greenwatch/viewmodels/MicrofonViewModel.java

 package com.example.greenwatch.viewmodels;
 
+import android.content.Context;
+import android.view.SurfaceHolder;
+
 import androidx.lifecycle.LiveData;
 import androidx.lifecycle.MutableLiveData;
 import androidx.lifecycle.ViewModel;
 
+import com.example.greenwatch.alarmrecorder.AlarmRecorder;
 import com.example.greenwatch.models.Device;
 import com.example.greenwatch.repositories.DeviceRepository;
+import com.example.greenwatch.sensors.AccelerometerSensor;
 import com.example.greenwatch.sensors.MicrofonSensor;
 
 import java.util.List;
     private MutableLiveData<Boolean> mStartAlarmRecording;
     private MicrofonSensor mMicrofonSensor;
     private DeviceRepository mDeviceRepository;
+    private AlarmRecorder mAlarmRecorder;
+
+    public void startMicrofonSensor() {
+        mMicrofonSensor.start();
+    }
+
+    public void stopMicrofonSensor() {
+        mMicrofonSensor.stop();
+    }
+
+    public void recalibrationMicrofonSensor() {
+        mMicrofonSensor.doRecalibration();
+    }
+
+    public float getAmplitudeInDB() {
+        return mMicrofonSensor.getAmplitudeInDB();
+    }
+
+    public LiveData<Boolean> getMicrofonAlarmDetected() {
+        return mMicrofonAlarmDetected;
+    }
 
     @Override
-    public void init() {
+    public void init(SurfaceHolder previewHolder) {
         if (mDeviceRepository == null) {
             mDeviceRepository = DeviceRepository.getInstance();
         }
         if (mMicrofonSensor == null) {
             mMicrofonSensor = MicrofonSensor.getInstance();
         }
+        if (mAlarmRecorder == null) {
+            mAlarmRecorder = AlarmRecorder.getInstance();
+        }
         if (mDeviceList == null) {
             mDeviceList = mDeviceRepository.getConnectedDeviceList();
         }
         if (mMicrofonAlarmDetected == null) {
             mMicrofonAlarmDetected = mMicrofonSensor.getAccelerometerAlarmDetected();
         }
-    }
-
-    public void startMicrofonSensor() {
-        mMicrofonSensor.start();
-    }
-
-    public void stopMicrofonSensor() {
-        mMicrofonSensor.stop();
-    }
-
-    public void recalibrationMicrofonSensor() {
-        mMicrofonSensor.doRecalibration();
-    }
-
-    public float getAmplitudeInDB() {
-        return mMicrofonSensor.getAmplitudeInDB();
-    }
-
-    public LiveData<Boolean> getMicrofonAlarmDetected() {
-        return mMicrofonAlarmDetected;
+        setAlarmRecordingPreviewHolder(previewHolder);
     }
 
     @Override
     public String getSystemTimeStamp() {
         return mDeviceRepository.getSystemTimeStamp();
     }
+
+    @Override
+    public void startAlarmRecording() {
+        mAlarmRecorder.startRecording();
+    }
+
+    @Override
+    public void stopAlarmRecording(Context context) {
+        mAlarmRecorder.stopRecording(context);
+    }
+
+    @Override
+    public void setAlarmRecordingPreviewHolder(SurfaceHolder previewHolder) {
+        mAlarmRecorder.setPreviewHolder(previewHolder);
+    }
 }

app/src/main/java/com/example/greenwatch/viewmodels/VideodetectionAndAccelerometerViewModel.java

 package com.example.greenwatch.viewmodels;
 
 import android.content.Context;
+import android.view.SurfaceHolder;
 
 import androidx.camera.lifecycle.ProcessCameraProvider;
 import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.Observer;
 import androidx.lifecycle.ViewModel;
 
+import com.example.greenwatch.alarmrecorder.AlarmRecorder;
 import com.example.greenwatch.models.Device;
 import com.example.greenwatch.repositories.DeviceRepository;
 import com.example.greenwatch.sensors.AccelerometerSensor;
     private AccelerometerSensor mAccelerometerSensor;
     private CameraSensor mCameraSensor;
     private DeviceRepository mDeviceRepository;
+    private AlarmRecorder mAlarmRecorder;
     private boolean videoAlarmDetected;
     private boolean accelerometerAlarmDetected;
     private boolean videodetectionAndAccelerometerAlarmDetected;
 
-    @Override
-    public void init() {
-        if (mDeviceRepository == null) {
-            mDeviceRepository = DeviceRepository.getInstance();
-        }
-        if (mAccelerometerSensor == null) {
-            mAccelerometerSensor = AccelerometerSensor.getInstance();
-        }
-        if (mCameraSensor == null) {
-            mCameraSensor = CameraSensor.getInstance();
-        }
-        if (mDeviceList == null) {
-            mDeviceList = mDeviceRepository.getConnectedDeviceList();
-        }
-        if (mAlarmHistoryList == null) {
-            mAlarmHistoryList = mDeviceRepository.getAlarmHistoryDeviceList();
-        }
-        if (mStartAlarmRecording == null) {
-            mStartAlarmRecording = mDeviceRepository.getStartAlarmRecording();
-        }
-        if (mAccelerometerAlarmDetected == null) {
-            mAccelerometerAlarmDetected = mAccelerometerSensor.getAccelerometerAlarmDetected();
-        }
-        if (mVideoAlarmDetected == null) {
-            mVideoAlarmDetected = mCameraSensor.getVideoAlarmDetectedValue();
-        }
-        videodetectionAndAccelerometerAlarmDetected = false;
-        videoAlarmDetected = false;
-        accelerometerAlarmDetected = false;
-        registerAlarmObserver();
-    }
-
     public void addValueToGesamtBE(float newValue) {
         mAccelerometerSensor.addValueToGesamtBE(newValue);
     }
         mAccelerometerAlarmDetected.removeObserver(observer);
     }
 
+    @Override
+    public void init(SurfaceHolder previewHolder) {
+        if (mDeviceRepository == null) {
+            mDeviceRepository = DeviceRepository.getInstance();
+        }
+        if (mAccelerometerSensor == null) {
+            mAccelerometerSensor = AccelerometerSensor.getInstance();
+        }
+        if (mCameraSensor == null) {
+            mCameraSensor = CameraSensor.getInstance();
+        }
+        if (mAlarmRecorder == null) {
+            mAlarmRecorder = AlarmRecorder.getInstance();
+        }
+        if (mDeviceList == null) {
+            mDeviceList = mDeviceRepository.getConnectedDeviceList();
+        }
+        if (mAlarmHistoryList == null) {
+            mAlarmHistoryList = mDeviceRepository.getAlarmHistoryDeviceList();
+        }
+        if (mStartAlarmRecording == null) {
+            mStartAlarmRecording = mDeviceRepository.getStartAlarmRecording();
+        }
+        if (mAccelerometerAlarmDetected == null) {
+            mAccelerometerAlarmDetected = mAccelerometerSensor.getAccelerometerAlarmDetected();
+        }
+        if (mVideoAlarmDetected == null) {
+            mVideoAlarmDetected = mCameraSensor.getVideoAlarmDetectedValue();
+        }
+        videodetectionAndAccelerometerAlarmDetected = false;
+        videoAlarmDetected = false;
+        accelerometerAlarmDetected = false;
+        registerAlarmObserver();
+        setAlarmRecordingPreviewHolder(previewHolder);
+    }
+
     @Override
     public LiveData<List<Device>> getConnectedDeviceList() {
         return mDeviceList;
     public String getSystemTimeStamp() {
         return mDeviceRepository.getSystemTimeStamp();
     }
+
+    @Override
+    public void startAlarmRecording() {
+        mAlarmRecorder.startRecording();
+    }
+
+    @Override
+    public void stopAlarmRecording(Context context) {
+        mAlarmRecorder.stopRecording(context);
+    }
+
+    @Override
+    public void setAlarmRecordingPreviewHolder(SurfaceHolder previewHolder) {
+        mAlarmRecorder.setPreviewHolder(previewHolder);
+    }
 }

app/src/main/java/com/example/greenwatch/viewmodels/VideodetectionViewModel.java

 package com.example.greenwatch.viewmodels;
 
 import android.content.Context;
+import android.view.SurfaceHolder;
 
 import androidx.camera.lifecycle.ProcessCameraProvider;
 import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.MutableLiveData;
 import androidx.lifecycle.ViewModel;
 
+import com.example.greenwatch.alarmrecorder.AlarmRecorder;
 import com.example.greenwatch.models.Device;
 import com.example.greenwatch.repositories.DeviceRepository;
 import com.example.greenwatch.sensors.CameraSensor;
     private MutableLiveData<List<Device>> mAlarmHistoryList;
     private MutableLiveData<Boolean> mStartAlarmRecording;
     private DeviceRepository mDeviceRepository;
+    private AlarmRecorder mAlarmRecorder;
     private CameraSensor mCameraSensor;
 
 
     }
 
     @Override
-    public void init() {
+    public void init(SurfaceHolder previewHolder) {
         if (mDeviceRepository == null) {
             mDeviceRepository = DeviceRepository.getInstance();
         }
         if (mCameraSensor == null) {
             mCameraSensor = CameraSensor.getInstance();
         }
+        if (mAlarmRecorder == null) {
+            mAlarmRecorder = AlarmRecorder.getInstance();
+        }
         if (mDeviceList == null) {
             mDeviceList = mDeviceRepository.getConnectedDeviceList();
         }
         if (mVideoAlarmDetected == null) {
             mVideoAlarmDetected = mCameraSensor.getVideoAlarmDetectedValue();
         }
+        setAlarmRecordingPreviewHolder(previewHolder);
     }
 
     public void bindImageAnalysis(ProcessCameraProvider cameraProvider, LifecycleOwner lifecycleOwner, Context context) {
     public String getSystemTimeStamp() {
         return mDeviceRepository.getSystemTimeStamp();
     }
+
+    @Override
+    public void startAlarmRecording() {
+        mAlarmRecorder.startRecording();
+    }
+
+    @Override
+    public void stopAlarmRecording(Context context) {
+        mAlarmRecorder.stopRecording(context);
+    }
+
+    @Override
+    public void setAlarmRecordingPreviewHolder(SurfaceHolder previewHolder) {
+        mAlarmRecorder.setPreviewHolder(previewHolder);
+    }
 }

app/src/main/java/com/example/greenwatch/viewmodels/ViewModelInterface.java

 package com.example.greenwatch.viewmodels;
 
+import android.content.Context;
+import android.view.SurfaceHolder;
+
 import androidx.lifecycle.LiveData;
 
 import com.example.greenwatch.models.Device;
 import java.util.List;
 
 public interface ViewModelInterface {
-    void init();
+    void init(SurfaceHolder previewHolder);
     LiveData<List<Device>> getConnectedDeviceList();
     LiveData<List<Device>> getAlarmHistoryList();
     LiveData<Boolean> getStartAlarmRecording();
     float getSensorMassage(String deviceID);
     String getLocalDeviceUUID();
     String getSystemTimeStamp();
+    void startAlarmRecording();
+    void stopAlarmRecording(Context context);
+    void setAlarmRecordingPreviewHolder(SurfaceHolder previewHolder);
 }