Added Alarm Recording to project but RecyclerView crashed

app/src/main/AndroidManifest.xml

@@ -3,7 +3,11 @@
     package="com.example.greenwatch">
 
     <uses-permission android:name="android.permission.INTERNET" />
-    <uses-permission android:name="android.permission.CAMERA"/>
+    <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.CAMERA" />
 
     <uses-feature android:name="android.hardware.camera"/>
 

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

@@ -11,6 +11,7 @@ import android.hardware.SensorEvent;
 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;
@@ -27,6 +28,7 @@ public class AccelerometerActivity extends AppCompatActivity implements SensorEv
 
     private SensorManager accelerometerManager;
     private Sensor accelerometerSensor;
+    private SurfaceView surfaceView;
     private TextView accelerometerStatusMessage;
     private TextView accelerometerDataTV;
     private TextView accelerometerWarningTV;
@@ -38,6 +40,7 @@ public class AccelerometerActivity extends AppCompatActivity implements SensorEv
         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);
         accelerometerWarningTV = (TextView) findViewById(R.id.tvAccelerometerWarning);
@@ -65,12 +68,11 @@ public class AccelerometerActivity extends AppCompatActivity implements SensorEv
         });
 
         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) {
                 deviceListAdapter.setDevices(devices);
-                Toast.makeText(AccelerometerActivity.this, "onChanged", Toast.LENGTH_LONG).show();
             }
         });
 
@@ -81,7 +83,21 @@ public class AccelerometerActivity extends AppCompatActivity implements SensorEv
             }
         });
 
-        mAccelerometerViewModel.getMovementDetectedValue().observe(this, new Observer<Boolean>() {
+        mAccelerometerViewModel.getStartAlarmRecording().observe(this, new Observer<Boolean>() {
+            @Override
+            public void onChanged(Boolean aBoolean) {
+                if (aBoolean) {
+                    mAccelerometerViewModel.startAlarmRecording();
+                    Toast.makeText(AccelerometerActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                }
+                else {
+                    mAccelerometerViewModel.stopAlarmRecording(AccelerometerActivity.this);
+                    Toast.makeText(AccelerometerActivity.this, "Stop Alarm Recording", Toast.LENGTH_LONG).show();
+                }
+            }
+        });
+
+        mAccelerometerViewModel.getAccelerometerAlarmDetected().observe(this, new Observer<Boolean>() {
             @Override
             public void onChanged(Boolean aBoolean) {
                 if (aBoolean) {

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

@@ -8,6 +8,7 @@ import androidx.recyclerview.widget.RecyclerView;
 
 import android.content.Intent;
 import android.os.Bundle;
+import android.view.SurfaceView;
 import android.view.View;
 import android.widget.Button;
 import android.widget.Toast;
@@ -27,6 +28,7 @@ public class MainActivity extends AppCompatActivity {
     private Button audiodetectionAndAccelerometerButton;
     private Button videodetectionAndAccelerometerButton;
     private Button connectionButton;
+    private SurfaceView surfaceView;
     private MainActivityViewModel mMainActivityViewModel;
 
     @Override
@@ -34,6 +36,7 @@ public class MainActivity extends AppCompatActivity {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
+        surfaceView = (SurfaceView) findViewById(R.id.surfaceViewMainActivity);
         audiodetectionButton = (Button) findViewById(R.id.audiodetectionButton);
         videodetectionButton = (Button) findViewById(R.id.videodetectionButton);
         accelerometerButton = (Button) findViewById(R.id.accelerometerButton);
@@ -56,13 +59,14 @@ public class MainActivity extends AppCompatActivity {
         alarmHistoryListRecyclerView.setAdapter(alarmHistoryListAdapter);
 
         mMainActivityViewModel = new ViewModelProvider(this).get(MainActivityViewModel.class);
-        mMainActivityViewModel.init();
+        mMainActivityViewModel.init(surfaceView.getHolder());
         mMainActivityViewModel.accessRequestCamera(this);
+        mMainActivityViewModel.accessRequestAudioRecording(this);
+        mMainActivityViewModel.accessRequestWriteExternalStorage(this);
         mMainActivityViewModel.getConnectedDeviceList().observe(this, new Observer<List<Device>>() {
             @Override
             public void onChanged(List<Device> devices) {
                 deviceListAdapter.setDevices(devices);
-                Toast.makeText(MainActivity.this, "onChanged", Toast.LENGTH_LONG).show();
             }
         });
 
@@ -73,6 +77,20 @@ public class MainActivity extends AppCompatActivity {
             }
         });
 
+        mMainActivityViewModel.getStartAlarmRecording().observe(this, new Observer<Boolean>() {
+            @Override
+            public void onChanged(Boolean aBoolean) {
+                if (aBoolean) {
+                    mMainActivityViewModel.startAlarmRecording();
+                    Toast.makeText(MainActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                }
+                else {
+                    mMainActivityViewModel.stopAlarmRecording(MainActivity.this);
+                    Toast.makeText(MainActivity.this, "Stop Alarm Recording", Toast.LENGTH_LONG).show();
+                }
+            }
+        });
+
         audiodetectionButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
@@ -89,7 +107,6 @@ public class MainActivity extends AppCompatActivity {
                 else {
                     mMainActivityViewModel.accessRequestCamera(MainActivity.this);
                 }
-
             }
         });
         accelerometerButton.setOnClickListener(new View.OnClickListener() {
@@ -140,7 +157,6 @@ public class MainActivity extends AppCompatActivity {
     public void openVideodetectionAndAccelerometerActivity(){
         //Intent intent = new Intent(this, VideodetectionAndAccelerometerActivity.class);
         //startActivity(intent);
-        mMainActivityViewModel.updateDevice(mMainActivityViewModel.getLocalDeviceUUID(), "24:00",  false, "Video", 0);
     }
     public void openConnectionActivity(){
         //Intent intent = new Intent(this, ConnectionActivity.class);

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

@@ -9,6 +9,7 @@ import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 
 import android.os.Bundle;
+import android.view.SurfaceView;
 import android.view.View;
 import android.widget.Button;
 import android.widget.Toast;
@@ -26,6 +27,7 @@ import java.util.concurrent.ExecutionException;
 public class VideodetectionActivity extends AppCompatActivity {
 
     private Button backToMainActivity;
+    private SurfaceView surfaceView;
     private VideodetectionViewModel mVideoDetectionViewModel;
 
     @Override
@@ -33,6 +35,7 @@ public class VideodetectionActivity extends AppCompatActivity {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_videodetection);
 
+        surfaceView = (SurfaceView) findViewById(R.id.surfaceViewVideodetection);
         backToMainActivity = (Button) findViewById(R.id.videodetectorBackToMainActivity);
 
         RecyclerView recyclerView = findViewById(R.id.deviceListRecyclerView);
@@ -57,12 +60,11 @@ public class VideodetectionActivity extends AppCompatActivity {
         });
 
         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) {
                 deviceListAdapter.setDevices(devices);
-                Toast.makeText(VideodetectionActivity.this, "onChanged", Toast.LENGTH_LONG).show();
             }
         });
 
@@ -73,6 +75,20 @@ public class VideodetectionActivity extends AppCompatActivity {
             }
         });
 
+        mVideoDetectionViewModel.getStartAlarmRecording().observe(this, new Observer<Boolean>() {
+            @Override
+            public void onChanged(Boolean aBoolean) {
+                if (aBoolean) {
+                    mVideoDetectionViewModel.startAlarmRecording();
+                    Toast.makeText(VideodetectionActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                }
+                else {
+                    mVideoDetectionViewModel.stopAlarmRecording(VideodetectionActivity.this);
+                    Toast.makeText(VideodetectionActivity.this, "Stop Alarm Recording", Toast.LENGTH_LONG).show();
+                }
+            }
+        });
+
         mVideoDetectionViewModel.getVideoAlarmDetectedValue().observe(this, new Observer<Boolean>() {
             @Override
             public void onChanged(Boolean aBoolean) {

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

@@ -1,27 +1,171 @@
-package com.example.greenwatch;
+/*package com.example.greenwatch;
 
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.camera.lifecycle.ProcessCameraProvider;
+import androidx.core.content.ContextCompat;
+import androidx.lifecycle.Observer;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
 
+import android.hardware.Sensor;
+import android.hardware.SensorEvent;
+import android.hardware.SensorEventListener;
+import android.hardware.SensorManager;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.Button;
+import android.widget.TextView;
+import android.widget.Toast;
 
-public class VideodetectionAndAccelerometerActivity extends AppCompatActivity {
+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.VideodetectionAndAccelerometerViewModel;
+import com.example.greenwatch.viewmodels.VideodetectionViewModel;
+import com.google.common.util.concurrent.ListenableFuture;
 
+import java.util.List;
+import java.util.concurrent.ExecutionException;
+
+public class VideodetectionAndAccelerometerActivity extends AppCompatActivity implements SensorEventListener {
+    private SensorManager accelerometerManager;
+    private Sensor accelerometerSensor;
+    private TextView videodetectionAndAccelerometerStatusMessage;
+    private TextView videodetectionAndAccelerometerDataTV;
+    private TextView videodetectionAndAccelerometerWarningTV;
     private Button backToMainActivity;
+    private VideodetectionAndAccelerometerViewModel mVideodetectionAndAccelerometerViewModel;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_videodetection_and_accelerometer);
 
+        videodetectionAndAccelerometerStatusMessage = (TextView) findViewById(R.id.tvvideodetectionAndAccelerometerStatusmessage);
+        videodetectionAndAccelerometerDataTV = (TextView) findViewById(R.id.tvvideodetectionAndAccelerometerData);
+        videodetectionAndAccelerometerWarningTV = (TextView) findViewById(R.id.tvvideodetectionAndAccelerometerWarning);
         backToMainActivity = (Button) findViewById(R.id.videodetectionAndAccelerometerBackToMainActivity);
 
+        RecyclerView recyclerView = findViewById(R.id.deviceListRecyclerView);
+        recyclerView.setLayoutManager(new LinearLayoutManager(this));
+        recyclerView.setHasFixedSize(true);
+
+        final DeviceListAdapter deviceListAdapter = new DeviceListAdapter();
+        recyclerView.setAdapter(deviceListAdapter);
+
+        RecyclerView alarmHistoryListRecyclerView = findViewById(R.id.alarmHistoryListRecyclerView);
+        alarmHistoryListRecyclerView.setLayoutManager(new LinearLayoutManager(this));
+        alarmHistoryListRecyclerView.setHasFixedSize(true);
+
+        final AlarmHistoryListAdapter alarmHistoryListAdapter  = new AlarmHistoryListAdapter();
+        alarmHistoryListRecyclerView.setAdapter(alarmHistoryListAdapter);
+
         backToMainActivity.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 finish();
             }
         });
+
+        mVideodetectionAndAccelerometerViewModel = new ViewModelProvider(this).get(VideodetectionAndAccelerometerViewModel.class);
+        mVideodetectionAndAccelerometerViewModel.init();
+        mVideodetectionAndAccelerometerViewModel.getConnectedDeviceList().observe(this, new Observer<List<Device>>() {
+            @Override
+            public void onChanged(List<Device> devices) {
+                deviceListAdapter.setDevices(devices);
+            }
+        });
+
+        mVideodetectionAndAccelerometerViewModel.getAlarmHistoryList().observe(this, new Observer<List<Device>>() {
+            @Override
+            public void onChanged(List<Device> devices) {
+                alarmHistoryListAdapter.setAlarmHistoryList(devices);
+            }
+        });
+
+        mVideodetectionAndAccelerometerViewModel.getStartAlarmRecording().observe(this, new Observer<Boolean>() {
+            @Override
+            public void onChanged(Boolean aBoolean) {
+                if (aBoolean) {
+                    Toast.makeText(VideodetectionAndAccelerometerActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                }
+                else {
+                    Toast.makeText(VideodetectionAndAccelerometerActivity.this, "Stop Alarm Recording", Toast.LENGTH_LONG).show();
+                }
+            }
+        });
+
+        mVideodetectionAndAccelerometerViewModel.getVideodetectionAndAccelerometerAlarmDetected().observe(this, new Observer<Boolean>() {
+            @Override
+            public void onChanged(Boolean aBoolean) {
+                if (aBoolean) {
+                    mVideodetectionAndAccelerometerViewModel.updateDevice(mVideodetectionAndAccelerometerViewModel.getLocalDeviceUUID(), mVideodetectionAndAccelerometerViewModel.getSystemTimeStamp(), true, "Accelerometer", 10);
+                }
+                else {
+                    mVideodetectionAndAccelerometerViewModel.updateDevice(mVideodetectionAndAccelerometerViewModel.getLocalDeviceUUID(), mVideodetectionAndAccelerometerViewModel.getSystemTimeStamp(), false, "Accelerometer", 0);
+                }
+
+            }
+        });
+
+        final ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(this);
+        cameraProviderFuture.addListener(() -> {
+            try {
+                mVideodetectionAndAccelerometerViewModel.bindImageAnalysis(cameraProviderFuture.get(), this, this);
+            } catch (ExecutionException | InterruptedException e) {
+                e.printStackTrace();
+            }
+        }, ContextCompat.getMainExecutor(this));
+
+        accelerometerManager = (SensorManager) getSystemService(SENSOR_SERVICE);
+        if (accelerometerManager.getSensorList(Sensor.TYPE_GYROSCOPE).size() == 0) {
+            accelerometerSensor = null;
+            Toast.makeText(VideodetectionAndAccelerometerActivity.this, "No accelerometer sensor available", Toast.LENGTH_LONG).show();
+        }
+        else {
+            accelerometerSensor = accelerometerManager.getSensorList(Sensor.TYPE_GYROSCOPE).get(0);
+        }
     }
-}
+
+    @Override
+    public void onSensorChanged(SensorEvent event) {
+        StringBuilder sb = new StringBuilder();
+        sb.append("x=")
+                .append(event.values[0])
+                .append("\ny=")
+                .append(event.values[1])
+                .append("\nz=")
+                .append(event.values[2]);
+        videodetectionAndAccelerometerDataTV.setText(sb.toString());
+        mVideodetectionAndAccelerometerViewModel.addValueToGesamtBE(event.values[0] + event.values[1] + event.values[2]);
+        mVideodetectionAndAccelerometerViewModel.meanValueCalculation();
+        mVideodetectionAndAccelerometerViewModel.calibrateAccelerometerSensor();
+        mVideodetectionAndAccelerometerViewModel.checkAlarmCondition();
+    }
+
+    @Override
+    public void onAccuracyChanged(Sensor sensor, int accuracy) {
+
+    }
+    @Override
+    protected void onResume() {
+        super.onResume();
+        if (accelerometerSensor != null) {
+            if (accelerometerManager.registerListener(this, accelerometerSensor, SensorManager.SENSOR_DELAY_GAME)) {
+                Toast.makeText(VideodetectionAndAccelerometerActivity.this, "We registered to the sensor", Toast.LENGTH_LONG).show();
+            } else {
+                Toast.makeText(VideodetectionAndAccelerometerActivity.this, "Registration did not work", Toast.LENGTH_LONG).show();
+            }
+        }
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+        if (accelerometerSensor != null) {
+            accelerometerManager.unregisterListener(this, accelerometerSensor);
+        }
+    }
+}*/

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

@@ -0,0 +1,251 @@
+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 Runnable audioRecorderRunnable;
+    private Runnable 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();
+    }
+
+    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
+
+        audioRecorderRunnable = new AudioRecorder(audioRecorder, audioPath);
+        videoRecorderRunnable = new VideoRecorder(videoRecorder, videoPath, previewHolder);
+        audioThread = new Thread(audioRecorderRunnable);
+        videoThread = new Thread(videoRecorderRunnable);
+
+        //Threads starten
+        videoThread.start();
+        audioThread.start();
+    }
+
+    public void stopRecording(Context context) {
+        isRecording = false;
+        try {
+            stopVideoRecording();
+            stopAudioRecording();
+
+            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
+        isRecording = true;
+        String externalStorageDirectory = Environment.getExternalStorageDirectory().getAbsolutePath();
+        String dcimDirectory = externalStorageDirectory + "/DCIM";
+        videoPath = dcimDirectory + "/video.mp4";
+        audioPath = dcimDirectory + "/audio.mp3";
+    }
+
+    private void stopVideoRecording(){
+        if (videoRecorder != null) {
+            videoRecorder.stop();
+            videoRecorder.release();
+            videoRecorder = null;
+        }
+    }
+
+    private void stopAudioRecording(){
+        if (audioRecorder != null) {
+            audioRecorder.stop();
+            audioRecorder.release();
+            audioRecorder = null;
+        }
+    }
+
+    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

@@ -0,0 +1,33 @@
+package com.example.greenwatch.alarmrecorder.runnables;
+
+import android.media.MediaRecorder;
+import android.widget.Toast;
+
+import com.example.greenwatch.MainActivity;
+
+import java.io.IOException;
+
+public class AudioRecorder implements Runnable {
+
+    private final MediaRecorder audioRecorder;
+    private final String audioPath;
+    public AudioRecorder(MediaRecorder audioRecorder, String audioPath) {
+        this.audioRecorder = audioRecorder;
+        this.audioPath = audioPath;
+    }
+    @Override
+    public void run() {
+        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

@@ -0,0 +1,38 @@
+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 final MediaRecorder videoRecorder;
+    private final String videoPath;
+    private SurfaceHolder previewHolder;
+
+    public VideoRecorder(MediaRecorder videoRecorder, String videoPath, SurfaceHolder previewHolder) {
+        this.videoRecorder = videoRecorder;
+        this.videoPath = videoPath;
+        this.previewHolder = previewHolder;
+    }
+    @Override
+    public void run() {
+        videoRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
+        videoRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
+        videoRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);
+        videoRecorder.setOutputFile(videoPath);
+        videoRecorder.setOrientationHint(90);
+        //todo find solution for videoView
+        videoRecorder.setPreviewDisplay(previewHolder.getSurface());
+
+        try {
+            videoRecorder.prepare();
+            videoRecorder.start();
+
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

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

@@ -17,10 +17,12 @@ public class DeviceRepository {
 
     private final int maxAlarmHistoryListSize = 20;
     private final String delimiter = ", ";
-    private final String SensorStatusKey = "An";
+    private final String sensorStatusKey = "An";
     private String localDeviceUUID;
     private static DeviceRepository deviceRepositoryInstance;
     private WiFiCommunication mWiFiCommunication;
+    private boolean startAlarmRecordingValue;
+    private MutableLiveData<Boolean> startAlarmRecording = new MutableLiveData<>();
     private MutableLiveData<List<Device>> deviceList = new MutableLiveData<>();
     private MutableLiveData<List<Device>> alarmHistoryList = new MutableLiveData<>();
     private HashMap<String, Device> connectedDevicesList = new HashMap<>();
@@ -29,6 +31,7 @@ public class DeviceRepository {
 
     private DeviceRepository() {
         setLocalDeviceUUID();
+        startAlarmRecordingValue = false;
     }
 
     public static synchronized DeviceRepository getInstance() {
@@ -52,11 +55,21 @@ public class DeviceRepository {
         return alarmHistoryList;
     }
 
+    public MutableLiveData<Boolean> getStartAlarmRecording() {
+        setMutableLiveDataStartAlarmRecording();
+        return startAlarmRecording;
+    }
+
     public void createNewDevice(String timeStamp, String deviceID, boolean sensorStatus, String sensorType, int sensorMassage){
         Device newDevice = new Device(timeStamp, deviceID, sensorStatus, sensorType, sensorMassage);
         if (sensorStatus) {
             setAlarmHistoryDeviceList(newDevice);
         }
+        boolean newStartAlarmRecordingValue = checkDeviceStatus();
+        if (startAlarmRecordingValue != newStartAlarmRecordingValue) {
+            startAlarmRecordingValue = newStartAlarmRecordingValue;
+            setMutableLiveDataStartAlarmRecording();
+        }
         addToConnectedDeviceList(newDevice.getDeviceID(), newDevice);
         setMutableLiveDataDeviceList();
     }
@@ -124,6 +137,11 @@ public class DeviceRepository {
                 setAlarmHistoryDeviceList(device);
             }
             device.setSensorStatus(sensorStatus);
+            boolean newStartAlarmRecordingValue = checkDeviceStatus();
+            if (startAlarmRecordingValue != newStartAlarmRecordingValue) {
+                startAlarmRecordingValue = newStartAlarmRecordingValue;
+                setMutableLiveDataStartAlarmRecording();
+            }
             addToConnectedDeviceList(checkedDeviceID, device);
             setMutableLiveDataDeviceList();
         }
@@ -177,6 +195,11 @@ public class DeviceRepository {
                 setAlarmHistoryDeviceList(device);
             }
             device.setSensorStatus(sensorStatus);
+            boolean newStartAlarmRecordingValue = checkDeviceStatus();
+            if (startAlarmRecordingValue != newStartAlarmRecordingValue) {
+                startAlarmRecordingValue = newStartAlarmRecordingValue;
+                setMutableLiveDataStartAlarmRecording();
+            }
             addToConnectedDeviceList(checkedDeviceID, device);
             setMutableLiveDataDeviceList();
 
@@ -245,6 +268,10 @@ public class DeviceRepository {
         alarmHistoryList.setValue(alarmHistoryDeviceList);
     }
 
+    private void setMutableLiveDataStartAlarmRecording() {
+        startAlarmRecording.setValue(startAlarmRecordingValue);
+    }
+
     private void addToConnectedDeviceList(String key, Device device) {
         connectedDevicesList.put(key, device);
         if (key.equals(checkDeviceID(localDeviceUUID))) {
@@ -272,7 +299,7 @@ public class DeviceRepository {
     }
 
     private boolean convertSensorStatus(String status) {
-        return status.equals(SensorStatusKey);
+        return status.equals(sensorStatusKey);
     }
 
     private void setAlarmHistoryDeviceList(Device device) {
@@ -283,4 +310,13 @@ public class DeviceRepository {
         alarmHistoryDeviceList.add(0, alarmHistoryDevice);
         setMutableLiveDataAlarmHistoryList();
     }
+
+    private boolean checkDeviceStatus() {
+        for (Device device : connectedDevicesList.values()) {
+            if (device.getSensorStatus()) {
+                return true;
+            }
+        }
+        return false;
+    }
 }

app/src/main/java/com/example/greenwatch/sensors/AccelerometerSensor.java

@@ -0,0 +1,85 @@
+package com.example.greenwatch.sensors;
+
+import androidx.lifecycle.MutableLiveData;
+
+import java.util.ArrayList;
+
+public class AccelerometerSensor {
+    private MutableLiveData<Boolean> mAccelerometerAlarmDetected = new MutableLiveData<>();
+    private static AccelerometerSensor accelerometerSensorInstance;
+    private boolean accelerometerAlarmDetected;
+    private ArrayList<Float> Gesamt_be;
+    int arraySize = 500;
+    int functionCallCount;
+    float meanValue;
+    float offsetValue;
+    float thresholdValue;
+    boolean startMeasuring;
+
+    private AccelerometerSensor() {
+        initGesamtBE();
+        accelerometerAlarmDetected = false;
+        setMutableLiveDataAccelerometerAlarmDetected();
+        functionCallCount = 0;
+        meanValue = 0.0f;
+        offsetValue = 0.1f;
+        thresholdValue = 0.15f;
+        startMeasuring = false;
+    }
+
+    public static synchronized AccelerometerSensor getInstance() {
+        if (accelerometerSensorInstance == null){
+            accelerometerSensorInstance = new AccelerometerSensor();
+        }
+        return accelerometerSensorInstance;
+    }
+
+    public MutableLiveData<Boolean> getAccelerometerAlarmDetected() {
+        setMutableLiveDataAccelerometerAlarmDetected();
+        return mAccelerometerAlarmDetected;
+    }
+
+    private void setMutableLiveDataAccelerometerAlarmDetected() {
+        mAccelerometerAlarmDetected.setValue(accelerometerAlarmDetected);
+    }
+
+    private void initGesamtBE() {
+        Gesamt_be = new ArrayList<>(arraySize);
+        for (int i = 0; i < arraySize; i++) {
+            Gesamt_be.add(0.0f);
+        }
+    }
+
+    public void addValueToGesamtBE(float newValue) {
+        if (Gesamt_be.size() == arraySize) {
+            Gesamt_be.remove(Gesamt_be.size() -1);
+        }
+        Gesamt_be.add(0, newValue);
+        functionCallCount++;
+    }
+
+    public void meanValueCalculation() {
+        for (float element : Gesamt_be) {
+            meanValue += Math.abs(element);
+        }
+        meanValue = meanValue/arraySize;
+    }
+
+    public void calibrateAccelerometerSensor() {
+        if (functionCallCount <= arraySize) {
+            offsetValue = meanValue;
+        }
+        else {
+            startMeasuring = true;
+        }
+    }
+
+    public void checkAlarmCondition() {
+        if (meanValue > (thresholdValue + offsetValue) && startMeasuring && !mAccelerometerAlarmDetected.getValue()) {
+            mAccelerometerAlarmDetected.setValue(true);
+        }
+        else if (meanValue < (thresholdValue + offsetValue) && mAccelerometerAlarmDetected.getValue()){
+            mAccelerometerAlarmDetected.setValue(false);
+        }
+    }
+}

app/src/main/java/com/example/greenwatch/sensors/CameraSensor.java

@@ -3,7 +3,6 @@ package com.example.greenwatch.sensors;
 import android.content.Context;
 import android.graphics.ImageFormat;
 import android.media.Image;
-import android.os.Handler;
 import android.util.Size;
 
 import androidx.camera.core.CameraSelector;
@@ -19,19 +18,9 @@ public class CameraSensor {
     private final MutableLiveData<Boolean> mVideoAlarmDetected = new MutableLiveData<>();
     private static CameraSensor cameraSensorInstance;
     private boolean videoAlarmDetected;
-    private boolean isMotionDetected;
     private ByteBuffer previousBuffer;
     private int previousWidth;
     private int previousHeight;
-    private final int threshold = 50;
-    private int startX;
-    private int startY;
-    private int endX;
-    private int endY;
-
-    private static final long ALARM_RESET_DELAY = 5000;
-    private Runnable alarmResetRunnable;
-    private final Handler alarmResetHandler = new Handler();
 
     private CameraSensor() {
         videoAlarmDetected = false;
@@ -45,11 +34,11 @@ public class CameraSensor {
     }
 
     public MutableLiveData<Boolean> getVideoAlarmDetectedValue() {
-        setMutableLiveDataVideoMovementDetected();
+        setMutableLiveDataVideoAlarmDetected();
         return mVideoAlarmDetected;
     }
 
-    private void setMutableLiveDataVideoMovementDetected() {
+    private void setMutableLiveDataVideoAlarmDetected() {
         mVideoAlarmDetected.setValue(videoAlarmDetected);
     }
 
@@ -70,7 +59,7 @@ public class CameraSensor {
 
                         if (previousHeight != 0) {
                             assert currentImage != null;
-                            isMotionDetected = compareFrames(currentImage);
+                            videoAlarmDetected = compareFrames(currentImage);
                         }
 
                         assert currentImage != null;
@@ -83,18 +72,6 @@ public class CameraSensor {
 
                         currentImage.close();
 
-                        if (isMotionDetected) {
-
-                            videoAlarmDetected = true;
-
-                            if(alarmResetRunnable != null) {
-                                alarmResetHandler.removeCallbacks(alarmResetRunnable);
-                            }
-
-                            alarmResetRunnable = this::resetAlarmStatus;
-                            alarmResetHandler.postDelayed(alarmResetRunnable, ALARM_RESET_DELAY);
-                        }
-
                         checkAlarmCondition();
 
                     }
@@ -108,82 +85,42 @@ public class CameraSensor {
     }
 
     private boolean compareFrames(Image currentImage) {
-        Image.Plane[] planes = currentImage.getPlanes();
-        ByteBuffer currentBuffer = planes[0].getBuffer();
+
+        ByteBuffer currentBuffer = currentImage.getPlanes()[0].getBuffer();
+
         int currentWidth = currentImage.getWidth();
         int currentHeight = currentImage.getHeight();
-        int yRowStride = planes[0].getRowStride();
-        int yPixelStride = planes[0].getPixelStride();
 
         if (previousWidth != currentWidth || previousHeight != currentHeight) {
             return false;
         }
 
-        int blockSize = kleinstesQuadrat(previousHeight, previousWidth) / 8;
+        for (int row = 0; row < previousHeight; row++) {
+            for (int col = 0; col < previousWidth; col++) {
 
-        int numBlocksX = currentWidth / blockSize;
-        int numBlocksY = currentHeight / blockSize;
+                int previousIndex = row * previousWidth + col;
+                int currentIndex = row * currentWidth + col;
 
-        for (int blockY = 0; blockY < numBlocksY; blockY++) {
-            for (int blockX = 0; blockX < numBlocksX; blockX++) {
-                startX = blockX * blockSize;
-                startY = blockY * blockSize;
-                endX = startX + blockSize;
-                endY = startY + blockSize;
+                int previousPixel = previousBuffer.get(previousIndex) & 0xFF;
+                int currentPixel = currentBuffer.get(currentIndex) & 0xFF;
 
-                float currentLuminance = berechneMittlereLuminanz(currentBuffer, yRowStride, yPixelStride);
-                float previousLuminance = berechneMittlereLuminanz(previousBuffer, yRowStride, yPixelStride);
-
-                int pixelDifference = Math.abs((int) previousLuminance - (int) currentLuminance);
+                int pixelDifference = Math.abs(previousPixel - currentPixel);
+                int threshold = 120;
 
                 if (pixelDifference > threshold) {
-                    System.out.println(pixelDifference);
                     return true;
                 }
             }
         }
-
         return false;
     }
 
-    private float berechneMittlereLuminanz(ByteBuffer buffer, int rowStride, int pixelStride) {
-        int sumLuminance = 0;
-        int countPixels = 0;
-
-        for (int row = startY; row < endY; row++) {
-            for (int col = startX; col < endX; col++) {
-                int bufferIndex = row * rowStride + col * pixelStride;
-                int currentPixel = buffer.get(bufferIndex) & 0xFF;
-
-                sumLuminance += currentPixel;
-                countPixels++;
-            }
-        }
-
-        return (float) sumLuminance / countPixels;
-    }
-
-    private int kleinstesQuadrat(int height, int width) {
-        if (height == width) {
-            return height;
-        } else if (height > width) {
-            return kleinstesQuadrat(height - width, width);
-        } else {
-            return kleinstesQuadrat(height, width - height);
-        }
-    }
-
-    private void resetAlarmStatus() {
-        videoAlarmDetected = false;
-        alarmResetRunnable = null;
-    }
-
     public void checkAlarmCondition() {
         if (videoAlarmDetected && !mVideoAlarmDetected.getValue()) {
-            setMutableLiveDataVideoMovementDetected();
+            setMutableLiveDataVideoAlarmDetected();
         }
         else if (!videoAlarmDetected && mVideoAlarmDetected.getValue()){
-            setMutableLiveDataVideoMovementDetected();
+            setMutableLiveDataVideoAlarmDetected();
         }
     }
 }

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

@@ -1,89 +1,73 @@
 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 java.text.SimpleDateFormat;
-import java.util.ArrayList;
-import java.util.Date;
 import java.util.List;
 
 public class AccelerometerViewModel extends ViewModel implements ViewModelInterface {
 
     private MutableLiveData<List<Device>> mDeviceList;
-    private MutableLiveData<Boolean> mMovementDetected = new MutableLiveData<>();
+    private MutableLiveData<Boolean> mAccelerometerAlarmDetected;
     private MutableLiveData<List<Device>> mAlarmHistoryList;
+    private MutableLiveData<Boolean> mStartAlarmRecording;
+    private AccelerometerSensor mAccelerometerSensor;
+    private AlarmRecorder mAlarmRecorder;
     private DeviceRepository mDeviceRepository;
-    private ArrayList<Float> Gesamt_be;
-    int arraySize = 500;
-    int functionCallCount;
-    float meanValue;
-    float offsetValue;
-    float thresholdValue;
-    boolean startMeasuring;
 
     @Override
-    public void init() {
-        if (mDeviceList == null) {
+    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 (mAlarmHistoryList == null) {
             mAlarmHistoryList = mDeviceRepository.getAlarmHistoryDeviceList();
         }
-        initGesamtBE();
-        mMovementDetected.setValue(false);
-        functionCallCount = 0;
-        meanValue = 0f;
-        offsetValue = 0.1f;
-        thresholdValue = 0.15f;
-        startMeasuring = false;
-    }
-
-    public void initGesamtBE() {
-        Gesamt_be = new ArrayList<>(arraySize);
-        for (int i = 0; i < arraySize; i++) {
-            Gesamt_be.add(0f);
+        if (mStartAlarmRecording == null) {
+            mStartAlarmRecording = mDeviceRepository.getStartAlarmRecording();
         }
+        if (mAccelerometerAlarmDetected == null) {
+            mAccelerometerAlarmDetected = mAccelerometerSensor.getAccelerometerAlarmDetected();
+        }
+        setAlarmRecordingPreviewHolder(previewHolder);
     }
 
     public void addValueToGesamtBE(float newValue) {
-        if (Gesamt_be.size() == arraySize) {
-            Gesamt_be.remove(Gesamt_be.size() -1);
-        }
-        Gesamt_be.add(0, newValue);
-        functionCallCount++;
+        mAccelerometerSensor.addValueToGesamtBE(newValue);
     }
 
     public void meanValueCalculation() {
-        for (float element : Gesamt_be) {
-            meanValue += Math.abs(element);
-        }
-        meanValue = meanValue/arraySize;
+        mAccelerometerSensor.meanValueCalculation();
     }
 
     public void calibrateAccelerometerSensor() {
-        if (functionCallCount <= arraySize) {
-            offsetValue = meanValue;
-        }
-        else {
-            startMeasuring = true;
-        }
+        mAccelerometerSensor.calibrateAccelerometerSensor();
     }
 
     public void checkAlarmCondition() {
-        if (meanValue > (thresholdValue + offsetValue) && startMeasuring && !mMovementDetected.getValue()) {
-            mMovementDetected.setValue(true);
-        }
-        else if (meanValue < (thresholdValue + offsetValue) && mMovementDetected.getValue()){
-            mMovementDetected.setValue(false);
-        }
+        mAccelerometerSensor.checkAlarmCondition();
     }
 
-    public LiveData<Boolean> getMovementDetectedValue() {
-        return mMovementDetected;
+    public LiveData<Boolean> getAccelerometerAlarmDetected() {
+        return mAccelerometerAlarmDetected;
     }
 
     @Override
@@ -96,6 +80,11 @@ public class AccelerometerViewModel extends ViewModel implements ViewModelInterf
         return mAlarmHistoryList;
     }
 
+    @Override
+    public LiveData<Boolean> getStartAlarmRecording() {
+        return mStartAlarmRecording;
+    }
+
     @Override
     public void updateDevice(String deviceID, String timeStamp, boolean sensorStatus, String sensorType, int sensorMassage) {
         mDeviceRepository.updateDevice(deviceID, timeStamp, sensorStatus, sensorType, sensorMassage);
@@ -160,4 +149,19 @@ public class AccelerometerViewModel extends ViewModel implements ViewModelInterf
     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

@@ -1,8 +1,10 @@
 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;
@@ -10,6 +12,7 @@ import androidx.lifecycle.LiveData;
 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;
@@ -20,23 +23,31 @@ public class MainActivityViewModel extends ViewModel implements ViewModelInterfa
 
     private MutableLiveData<List<Device>> mDeviceList;
     private MutableLiveData<List<Device>> mAlarmHistoryList;
+    private MutableLiveData<Boolean> mStartAlarmRecording;
     private DeviceRepository mDeviceRepository;
-    private static final int RECHTEANFORDERUNG_KAMERA = 10;
+    private AlarmRecorder mAlarmRecorder;
+    private static final int RIGHTS_REQUEST_CAMERA = 10;
+    private static final int REQUEST_PERMISSION = 200;
 
     @Override
-    public void init() {
+    public void init(SurfaceHolder previewHolder) {
         WiFiCommunication mWiFiCommunication;
         if(mDeviceList != null) {
             return;
         }
+        if (mAlarmRecorder == null) {
+            mAlarmRecorder = AlarmRecorder.getInstance();
+        }
         //todo: check if WiFi instanz can be hold only by the repository
         mDeviceRepository = DeviceRepository.getInstance();
         mWiFiCommunication = WiFiCommunication.getInstance();
         mDeviceRepository.setWiFiCommunication(mWiFiCommunication);
         mWiFiCommunication.setDeviceRepository(mDeviceRepository);
-        mDeviceRepository.createNewDevice(mDeviceRepository.getSystemTimeStamp(), mDeviceRepository.getLocalDeviceUUID(), false, "No Sensor selected", 0);
+        //mDeviceRepository.createNewDevice(mDeviceRepository.getSystemTimeStamp(), mDeviceRepository.getLocalDeviceUUID(), false, "No Sensor selected", 0);
         mDeviceList = mDeviceRepository.getConnectedDeviceList();
         mAlarmHistoryList = mDeviceRepository.getAlarmHistoryDeviceList();
+        mStartAlarmRecording = mDeviceRepository.getStartAlarmRecording();
+        setAlarmRecordingPreviewHolder(previewHolder);
     }
 
     public boolean isCameraAccessAllowed(Context context) {
@@ -44,7 +55,23 @@ public class MainActivityViewModel extends ViewModel implements ViewModelInterfa
     }
 
     public void accessRequestCamera(Activity activity) {
-        ActivityCompat.requestPermissions(activity, new String[]{android.Manifest.permission.CAMERA}, RECHTEANFORDERUNG_KAMERA);
+        ActivityCompat.requestPermissions(activity, new String[]{android.Manifest.permission.CAMERA}, RIGHTS_REQUEST_CAMERA);
+    }
+
+    public boolean isAudioRecordingAccessAllowed(Context context) {
+        return ContextCompat.checkSelfPermission(context, Manifest.permission.RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED;
+    }
+
+    public void accessRequestAudioRecording(Activity activity) {
+        ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.RECORD_AUDIO}, REQUEST_PERMISSION);
+    }
+
+    public boolean isWriteExternalStorageAccessAllowed(Context context) {
+        return ContextCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED;
+    }
+
+    public void accessRequestWriteExternalStorage(Activity activity) {
+        ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_PERMISSION);
     }
 
     @Override
@@ -57,6 +84,11 @@ public class MainActivityViewModel extends ViewModel implements ViewModelInterfa
         return mAlarmHistoryList;
     }
 
+    @Override
+    public LiveData<Boolean> getStartAlarmRecording() {
+        return mStartAlarmRecording;
+    }
+
     @Override
     public void updateDevice(String deviceID, String timeStamp, boolean sensorStatus, String sensorType, int sensorMassage) {
         mDeviceRepository.updateDevice(deviceID, timeStamp, sensorStatus, sensorType, sensorMassage);
@@ -121,4 +153,19 @@ public class MainActivityViewModel extends ViewModel implements ViewModelInterfa
     public String getSystemTimeStamp() {
         return null;
     }
+
+    @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

@@ -0,0 +1,196 @@
+package com.example.greenwatch.viewmodels;
+
+import android.content.Context;
+
+import androidx.camera.lifecycle.ProcessCameraProvider;
+import androidx.lifecycle.LifecycleOwner;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.Observer;
+import androidx.lifecycle.ViewModel;
+
+import com.example.greenwatch.models.Device;
+import com.example.greenwatch.repositories.DeviceRepository;
+import com.example.greenwatch.sensors.AccelerometerSensor;
+import com.example.greenwatch.sensors.CameraSensor;
+
+import java.util.List;
+
+/*public class VideodetectionAndAccelerometerViewModel extends ViewModel implements ViewModelInterface{
+    private MutableLiveData<List<Device>> mDeviceList;
+    private MutableLiveData<Boolean> mAccelerometerAlarmDetected;
+    private MutableLiveData<Boolean> mVideoAlarmDetected;
+    private MutableLiveData<Boolean> mVideodetectionAndAccelerometerAlarmDetected = new MutableLiveData<>();
+    private MutableLiveData<List<Device>> mAlarmHistoryList;
+    private MutableLiveData<Boolean> mStartAlarmRecording;
+    private AccelerometerSensor mAccelerometerSensor;
+    private CameraSensor mCameraSensor;
+    private DeviceRepository mDeviceRepository;
+    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;
+        registerAlarmObserver();
+    }
+
+    public void addValueToGesamtBE(float newValue) {
+        mAccelerometerSensor.addValueToGesamtBE(newValue);
+    }
+
+    public void meanValueCalculation() {
+        mAccelerometerSensor.meanValueCalculation();
+    }
+
+    public void calibrateAccelerometerSensor() {
+        mAccelerometerSensor.calibrateAccelerometerSensor();
+    }
+
+    public void checkAlarmCondition() {
+        mAccelerometerSensor.checkAlarmCondition();
+    }
+
+    public void bindImageAnalysis(ProcessCameraProvider cameraProvider, LifecycleOwner lifecycleOwner, Context context) {
+        mCameraSensor.bindImageAnalysis(cameraProvider, lifecycleOwner, context);
+    }
+
+    public LiveData<Boolean> getVideodetectionAndAccelerometerAlarmDetected() {
+        setMutableLiveDataVideodetectionAndAccelerometerAlarmDetected();
+        return mVideodetectionAndAccelerometerAlarmDetected;
+    }
+
+    private void setMutableLiveDataVideodetectionAndAccelerometerAlarmDetected() {
+        mVideodetectionAndAccelerometerAlarmDetected.setValue(VideodetectionAndAccelerometerAlarmDetected);
+    }
+
+    Observer<Boolean> observer = new Observer<Boolean>() {
+        @Override
+        public void onChanged(Boolean aBoolean) {
+            if (mVideoAlarmDetected.getValue() || mAccelerometerAlarmDetected.getValue() && !VideodetectionAndAccelerometerAlarmDetected) {
+                VideodetectionAndAccelerometerAlarmDetected = true;
+                setMutableLiveDataVideodetectionAndAccelerometerAlarmDetected();
+
+            }
+            else if (!mVideoAlarmDetected.getValue() && !mAccelerometerAlarmDetected.getValue() && VideodetectionAndAccelerometerAlarmDetected) {
+                VideodetectionAndAccelerometerAlarmDetected = false;
+                setMutableLiveDataVideodetectionAndAccelerometerAlarmDetected();
+            }
+        }
+    };
+
+    private void registerAlarmObserver() {
+        mVideoAlarmDetected.observeForever(observer);
+        mAccelerometerAlarmDetected.observeForever(observer);
+    }
+
+    @Override
+    protected void onCleared() {
+        super.onCleared();
+        mVideoAlarmDetected.removeObserver(observer);
+        mAccelerometerAlarmDetected.removeObserver(observer);
+    }
+
+    @Override
+    public LiveData<List<Device>> getConnectedDeviceList() {
+        return mDeviceList;
+    }
+
+    @Override
+    public LiveData<List<Device>> getAlarmHistoryList() {
+        return mAlarmHistoryList;
+    }
+
+    @Override
+    public LiveData<Boolean> getStartAlarmRecording() {
+        return mStartAlarmRecording;
+    }
+
+    @Override
+    public void updateDevice(String deviceID, String timeStamp, boolean sensorStatus, String sensorType, int sensorMassage) {
+        mDeviceRepository.updateDevice(deviceID, timeStamp, sensorStatus, sensorType, sensorMassage);
+    }
+
+    @Override
+    public void setTimeStamp(String deviceID, String timeStamp) {
+        mDeviceRepository.setTimeStamp(deviceID, timeStamp);
+    }
+
+    @Override
+    public String getTimeStamp(String deviceID) {
+        return mDeviceRepository.getTimeStamp(deviceID);
+    }
+
+    @Override
+    public void setDeviceID(String deviceID, String newDeviceID) {
+        mDeviceRepository.setDeviceID(deviceID, newDeviceID);
+    }
+
+    @Override
+    public String getDeviceID(String deviceID) {
+        return mDeviceRepository.getDeviceID(deviceID);
+    }
+
+    @Override
+    public void setSensorStatus(String deviceID, boolean sensorStatus) {
+        mDeviceRepository.setSensorStatus(deviceID, sensorStatus);
+    }
+
+    @Override
+    public boolean getSensorStatus(String deviceID) {
+        return mDeviceRepository.getSensorStatus(deviceID);
+    }
+
+    @Override
+    public void setSensorType(String deviceID, String sensorType) {
+        mDeviceRepository.setSensorType(deviceID, sensorType);
+    }
+
+    @Override
+    public String getSensorType(String deviceID) {
+        return mDeviceRepository.getSensorType(deviceID);
+    }
+
+    @Override
+    public void setSensorMassage(String deviceID, int sensorMessage) {
+        mDeviceRepository.setSensorMassage(deviceID, sensorMessage);
+    }
+
+    @Override
+    public int getSensorMassage(String deviceID) {
+        return mDeviceRepository.getSensorMassage(deviceID);
+    }
+
+    @Override
+    public String getLocalDeviceUUID() {
+        return mDeviceRepository.getLocalDeviceUUID();
+    }
+
+    @Override
+    public String getSystemTimeStamp() {
+        return mDeviceRepository.getSystemTimeStamp();
+    }
+}*/

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

@@ -1,6 +1,7 @@
 package com.example.greenwatch.viewmodels;
 
 import android.content.Context;
+import android.view.SurfaceHolder;
 
 import androidx.camera.lifecycle.ProcessCameraProvider;
 import androidx.lifecycle.LifecycleOwner;
@@ -8,6 +9,7 @@ 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.CameraSensor;
@@ -19,7 +21,9 @@ public class VideodetectionViewModel extends ViewModel implements ViewModelInter
     private MutableLiveData<List<Device>> mDeviceList;
     private MutableLiveData<Boolean> mVideoAlarmDetected;
     private MutableLiveData<List<Device>> mAlarmHistoryList;
+    private MutableLiveData<Boolean> mStartAlarmRecording;
     private DeviceRepository mDeviceRepository;
+    private AlarmRecorder mAlarmRecorder;
     private CameraSensor mCameraSensor;
 
 
@@ -28,22 +32,29 @@ public class VideodetectionViewModel extends ViewModel implements ViewModelInter
     }
 
     @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 (mAlarmHistoryList == null) {
             mAlarmHistoryList = mDeviceRepository.getAlarmHistoryDeviceList();
         }
+        if (mStartAlarmRecording == null) {
+            mStartAlarmRecording = mDeviceRepository.getStartAlarmRecording();
+        }
         if (mVideoAlarmDetected == null) {
             mVideoAlarmDetected = mCameraSensor.getVideoAlarmDetectedValue();
         }
+        setAlarmRecordingPreviewHolder(previewHolder);
     }
 
     public void bindImageAnalysis(ProcessCameraProvider cameraProvider, LifecycleOwner lifecycleOwner, Context context) {
@@ -64,6 +75,11 @@ public class VideodetectionViewModel extends ViewModel implements ViewModelInter
         return mAlarmHistoryList;
     }
 
+    @Override
+    public LiveData<Boolean> getStartAlarmRecording() {
+        return mStartAlarmRecording;
+    }
+
     @Override
     public void updateDevice(String deviceID, String timeStamp, boolean sensorStatus, String sensorType, int sensorMassage) {
         mDeviceRepository.updateDevice(deviceID, timeStamp, sensorStatus, sensorType, sensorMassage);
@@ -128,4 +144,19 @@ public class VideodetectionViewModel extends ViewModel implements ViewModelInter
     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

@@ -1,5 +1,8 @@
 package com.example.greenwatch.viewmodels;
 
+import android.content.Context;
+import android.view.SurfaceHolder;
+
 import androidx.lifecycle.LiveData;
 
 import com.example.greenwatch.models.Device;
@@ -7,9 +10,10 @@ 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();
     void updateDevice(String deviceID, String timeStamp, boolean sensorStatus, String sensorType, int sensorMassage);
     void setTimeStamp(String deviceID, String timeStamp);
     String getTimeStamp(String deviceID);
@@ -23,4 +27,7 @@ public interface ViewModelInterface {
     int getSensorMassage(String deviceID);
     String getLocalDeviceUUID();
     String getSystemTimeStamp();
+    void startAlarmRecording();
+    void stopAlarmRecording(Context context);
+    void setAlarmRecordingPreviewHolder(SurfaceHolder previewHolder);
 }

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

@@ -8,6 +8,13 @@
     android:padding="10dp"
     tools:context=".AccelerometerActivity">
 
+    <SurfaceView
+        android:id="@+id/surfaceViewAccelerometer"
+        android:layout_width="1dp"
+        android:layout_height="1dp"
+        android:visibility="visible">
+    </SurfaceView>
+
     <TextView
         android:id="@+id/tvAccelerometerStatusmessage"
         android:layout_width="match_parent"

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

@@ -12,7 +12,7 @@
         android:id="@+id/alarmHistoryListRecyclerView"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:layout_weight="3"
+        android:layout_weight="4"
         tools:listitem="@layout/alarm_history_item">
     </androidx.recyclerview.widget.RecyclerView>
 
@@ -20,9 +20,15 @@
         android:id="@+id/deviceListRecyclerView"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:layout_weight="3"
+        android:layout_weight="4"
         tools:listitem="@layout/device_item">
     </androidx.recyclerview.widget.RecyclerView>
+
+    <SurfaceView
+        android:id="@+id/surfaceViewMainActivity"
+        android:layout_width="1dp"
+        android:layout_height="1dp">
+    </SurfaceView>
     
     <LinearLayout
         android:layout_width="match_parent"

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

@@ -8,6 +8,13 @@
     android:padding="10dp"
     tools:context=".VideodetectionActivity">
 
+    <SurfaceView
+        android:id="@+id/surfaceViewVideodetection"
+        android:layout_width="1dp"
+        android:layout_height="1dp"
+        android:visibility="visible">
+    </SurfaceView>
+
     <TextView
         android:id="@+id/tvVideodetectionStatusmessage"
         android:layout_width="match_parent"

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

@@ -9,10 +9,24 @@
     tools:context=".VideodetectionAndAccelerometerActivity">
 
     <TextView
-        android:id="@+id/tvVideodetectionAndAccelerometerStatusmessage"
+        android:id="@+id/tvvideodetectionAndAccelerometerStatusmessage"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:text="Videodetection + Accelerometer Activity">
+        android:text="">
+    </TextView>
+
+    <TextView
+        android:id="@+id/tvvideodetectionAndAccelerometerData"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="">
+    </TextView>
+
+    <TextView
+        android:id="@+id/tvvideodetectionAndAccelerometerWarning"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="">
     </TextView>
 
     <Button
@@ -22,4 +36,27 @@
         android:text="Back to MainActivity">
     </Button>
 
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical">
+
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/deviceListRecyclerView"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            tools:listitem="@layout/device_item"
+            android:layout_weight="1">
+        </androidx.recyclerview.widget.RecyclerView>
+
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/alarmHistoryListRecyclerView"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            tools:listitem="@layout/alarm_history_item"
+            android:layout_weight="1">
+        </androidx.recyclerview.widget.RecyclerView>
+
+    </LinearLayout>
+
 </LinearLayout>