Änderungen im Manifest und in der MainActivity.java: Ergänzung zweier Internet-Permissions inklusive Abfrage dieser, wenn der Button "connectionButton" betätigt wird.

Allerdings: Internet Permission wird automatisch erteilt, Abfrage ist eigentlich sinnlos.

app/build.gradle

@@ -35,4 +35,10 @@ dependencies {
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.5'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
+
+    def camerax_version = "1.2.3"
+    implementation "androidx.camera:camera-camera2:${camerax_version}"
+    implementation "androidx.camera:camera-lifecycle:${camerax_version}"
+    implementation "androidx.camera:camera-view:${camerax_version}"
+
 }

app/src/main/AndroidManifest.xml

@@ -3,11 +3,12 @@
     package="com.example.greenwatch">
 
     <uses-permission android:name="android.permission.INTERNET" />
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.CAMERA"/>
-    <uses-permission android:name="android.permission.READ_MEDIA_AUDIO" />
+    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
-    <uses-permission android:name="android.permission.READ_MEDIA_VIDEO" />
+    <uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />
-    <uses-permission android:name="android.permission.RECORD_AUDIO" />
+
-    <uses-permission android:name="android.permission.CAMERA" />
+
+    <uses-feature android:name="android.hardware.camera"/>
 
     <application
         android:allowBackup="true"
@@ -16,6 +17,21 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.GreenWatch">
+        <activity
+            android:name=".VideodetectionAndAccelerometerActivity"
+            android:exported="false" />
+        <activity
+            android:name=".AudiodetectionAndAccelerometerActivity"
+            android:exported="false" />
+        <activity
+            android:name=".VideodetectionActivity"
+            android:exported="false" />
+        <activity
+            android:name=".AudiodetectionActivity"
+            android:exported="false" />
+        <activity
+            android:name=".AccelerometerActivity"
+            android:exported="false" />
         <activity
             android:name=".MainActivity"
             android:exported="true">

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

@@ -0,0 +1,158 @@
+package com.example.greenwatch;
+
+import androidx.appcompat.app.AppCompatActivity;
+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;
+
+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 java.util.List;
+
+public class AccelerometerActivity extends AppCompatActivity implements SensorEventListener {
+
+    private SensorManager accelerometerManager;
+    private Sensor accelerometerSensor;
+    private TextView accelerometerStatusMessage;
+    private TextView accelerometerDataTV;
+    private TextView accelerometerWarningTV;
+    private Button backToMainActivityButton;
+    private AccelerometerViewModel mAccelerometerViewModel;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_accelerometer);
+
+        accelerometerStatusMessage = (TextView) findViewById(R.id.tvAccelerometerStatusmessage);
+        accelerometerDataTV = (TextView) findViewById(R.id.tvAccelerometerData);
+        accelerometerWarningTV = (TextView) findViewById(R.id.tvAccelerometerWarning);
+        backToMainActivityButton = (Button) findViewById(R.id.accelerometerBackToMainActivity);
+
+        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);
+
+        backToMainActivityButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                finish();
+            }
+        });
+
+        mAccelerometerViewModel = new ViewModelProvider(this).get(AccelerometerViewModel.class);
+        mAccelerometerViewModel.init();
+        mAccelerometerViewModel.getConnectedDeviceList().observe(this, new Observer<List<Device>>() {
+            @Override
+            public void onChanged(List<Device> devices) {
+                deviceListAdapter.setDevices(devices);
+            }
+        });
+
+        mAccelerometerViewModel.getAlarmHistoryList().observe(this, new Observer<List<Device>>() {
+            @Override
+            public void onChanged(List<Device> devices) {
+                alarmHistoryListAdapter.setAlarmHistoryList(devices);
+            }
+        });
+
+        mAccelerometerViewModel.getStartAlarmRecording().observe(this, new Observer<Boolean>() {
+            @Override
+            public void onChanged(Boolean aBoolean) {
+                if (aBoolean) {
+                    Toast.makeText(AccelerometerActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                }
+                else {
+                    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) {
+                    mAccelerometerViewModel.updateDevice(mAccelerometerViewModel.getLocalDeviceUUID(), mAccelerometerViewModel.getSystemTimeStamp(), true, "Accelerometer", 10);
+                }
+                else {
+                    mAccelerometerViewModel.updateDevice(mAccelerometerViewModel.getLocalDeviceUUID(), mAccelerometerViewModel.getSystemTimeStamp(), false, "Accelerometer", 0);
+                }
+
+            }
+        });
+
+        accelerometerManager = (SensorManager) getSystemService(SENSOR_SERVICE);
+        if (accelerometerManager.getSensorList(Sensor.TYPE_GYROSCOPE).size() == 0) {
+            accelerometerSensor = null;
+            Toast.makeText(AccelerometerActivity.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]);
+        accelerometerDataTV.setText(sb.toString());
+        mAccelerometerViewModel.addValueToGesamtBE(event.values[0] + event.values[1] + event.values[2]);
+        mAccelerometerViewModel.meanValueCalculation();
+        mAccelerometerViewModel.calibrateAccelerometerSensor();
+        mAccelerometerViewModel.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(AccelerometerActivity.this, "We registered to the sensor", Toast.LENGTH_LONG).show();
+            } else {
+                Toast.makeText(AccelerometerActivity.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.java

@@ -1,225 +0,0 @@
-package com.example.greenwatch;
-
-import android.graphics.SurfaceTexture;
-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.Surface;
-import android.view.SurfaceHolder;
-
-import java.io.File;
-import java.io.IOException;
-import java.nio.ByteBuffer;
-
-public class AlarmRecorder {
-    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 MediaRecorder videoRecorder;
-    private MediaRecorder audioRecorder;
-    //private SurfaceHolder previewHolder;
-    private Surface surface;
-    private Thread videoThread; // Video-Thread als Instanzvariable
-    private Thread audioThread; // Audio-Thread als Instanzvariable
-
-    public AlarmRecorder(SurfaceTexture surfaceTexture) {
-        audioRecorder = new MediaRecorder();
-        videoRecorder = new MediaRecorder();
-        videoExtractor = new MediaExtractor();
-        audioExtractor = new MediaExtractor();
-        this.surface = new Surface(surfaceTexture);
-    }
-
-    public void startRecording() {
-        createStoragePaths(); //Speicherort und -namen für Audio- und Video-Datei
-
-        audioRecorderRunnable = new AudioRecorder(audioRecorder, audioPath);
-        videoRecorderRunnable = new VideoRecorder(videoRecorder, videoPath, surface);
-        audioThread = new Thread(audioRecorderRunnable);
-        videoThread = new Thread(videoRecorderRunnable);
-
-        //Threads starten
-        videoThread.start();
-        audioThread.start();
-    }
-
-    public void stopRecording() {
-        try {
-            stopVideoRecording();
-            stopAudioRecording();
-
-            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();
-            }
-        } 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 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/AudioRecorder.java

@@ -1,30 +0,0 @@
-package com.example.greenwatch;
-
-import android.media.MediaRecorder;
-
-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/AudiodetectionActivity.java

@@ -0,0 +1,27 @@
+package com.example.greenwatch;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+
+public class AudiodetectionActivity extends AppCompatActivity {
+
+    private Button backToMainActivityButton;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_audiodetection);
+
+        backToMainActivityButton = (Button) findViewById(R.id.audiodetectorBackToMainActivity);
+
+        backToMainActivityButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                finish();
+            }
+        });
+    }
+}

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

@@ -0,0 +1,27 @@
+package com.example.greenwatch;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+
+public class AudiodetectionAndAccelerometerActivity extends AppCompatActivity {
+
+    private Button backToMainActivity;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_audiodetection_and_accelerometer);
+
+        backToMainActivity = (Button) findViewById(R.id.audiodetectionAndAccelerometerBackToMainActivity);
+
+        backToMainActivity.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                finish();
+            }
+        });
+    }
+}

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

@@ -0,0 +1,4 @@
+package com.example.greenwatch;
+
+public class Beschleunigungssensor {
+}

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

@@ -0,0 +1,4 @@
+package com.example.greenwatch;
+
+public class Kamera {
+}

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

@@ -1,101 +1,192 @@
 package com.example.greenwatch;
 
-import android.Manifest;
+import androidx.appcompat.app.AlertDialog;
-import android.content.pm.PackageManager;
-import android.graphics.SurfaceTexture;
-import android.os.Bundle;
-import android.view.TextureView;
-import android.view.View;
-import android.widget.Button;
-import android.widget.Toast;
-
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.core.app.ActivityCompat;
 import androidx.core.content.ContextCompat;
+import androidx.lifecycle.Observer;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
 
-public class MainActivity extends AppCompatActivity implements TextureView.SurfaceTextureListener{
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.os.Build;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.Toast;
+import android.Manifest;
 
-    private boolean isRecording = false;
+import com.example.greenwatch.adapters.AlarmHistoryListAdapter;
-    private static final int REQUEST_PERMISSION = 200;
+import com.example.greenwatch.adapters.DeviceListAdapter;
-    private Button button;
+import com.example.greenwatch.models.Device;
-    private TextureView textureView;
+import com.example.greenwatch.viewmodels.MainActivityViewModel;
-    private AlarmRecorder alarmRecorder;
+
+import java.util.List;
+
+public class MainActivity extends AppCompatActivity {
+
+    private Button audiodetectionButton;
+    private Button videodetectionButton;
+    private Button accelerometerButton;
+    private Button audiodetectionAndAccelerometerButton;
+    private Button videodetectionAndAccelerometerButton;
+    private Button connectionButton;
+    private MainActivityViewModel mMainActivityViewModel;
+
+    private static final int REQUEST_PERMISSION_INTERNET = 123;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
-        button = findViewById(R.id.button);
+        audiodetectionButton = (Button) findViewById(R.id.audiodetectionButton);
-        textureView = findViewById(R.id.textureView);
+        videodetectionButton = (Button) findViewById(R.id.videodetectionButton);
-        textureView.setSurfaceTextureListener(this);
+        accelerometerButton = (Button) findViewById(R.id.accelerometerButton);
+        audiodetectionAndAccelerometerButton = (Button) findViewById(R.id.audiodetectionAndAccelerometerButton);
+        videodetectionAndAccelerometerButton = (Button) findViewById(R.id.videodetectionAndAccelerometerButton);
+        connectionButton = (Button) findViewById(R.id.connectionButton);
 
-        button.setOnClickListener(new View.OnClickListener() {
+        RecyclerView deviceListRecyclerView = findViewById(R.id.deviceListRecyclerView);
+        deviceListRecyclerView.setLayoutManager(new LinearLayoutManager(this));
+        deviceListRecyclerView.setHasFixedSize(true);
+
+        final DeviceListAdapter deviceListAdapter = new DeviceListAdapter();
+        deviceListRecyclerView.setAdapter(deviceListAdapter);
+
+        RecyclerView alarmHistoryListRecyclerView = findViewById(R.id.alarmHistoryListRecyclerView);
+        alarmHistoryListRecyclerView.setLayoutManager(new LinearLayoutManager(this));
+        alarmHistoryListRecyclerView.setHasFixedSize(true);
+
+        final AlarmHistoryListAdapter alarmHistoryListAdapter  = new AlarmHistoryListAdapter();
+        alarmHistoryListRecyclerView.setAdapter(alarmHistoryListAdapter);
+
+        mMainActivityViewModel = new ViewModelProvider(this).get(MainActivityViewModel.class);
+        mMainActivityViewModel.init();
+        mMainActivityViewModel.accessRequestCamera(this);
+        mMainActivityViewModel.getConnectedDeviceList().observe(this, new Observer<List<Device>>() {
+            @Override
+            public void onChanged(List<Device> devices) {
+                deviceListAdapter.setDevices(devices);
+            }
+        });
+
+        mMainActivityViewModel.getAlarmHistoryList().observe(this, new Observer<List<Device>>() {
+            @Override
+            public void onChanged(List<Device> devices) {
+                alarmHistoryListAdapter.setAlarmHistoryList(devices);
+            }
+        });
+
+        mMainActivityViewModel.getStartAlarmRecording().observe(this, new Observer<Boolean>() {
+            @Override
+            public void onChanged(Boolean aBoolean) {
+                if (aBoolean) {
+                    Toast.makeText(MainActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                }
+                else {
+                    Toast.makeText(MainActivity.this, "Stop Alarm Recording", Toast.LENGTH_LONG).show();
+                }
+            }
+        });
+
+        audiodetectionButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                if (!isRecording) {
+                //openAudiodetectionActivity();
-                    if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA)
+                mMainActivityViewModel.updateDevice(mMainActivityViewModel.getLocalDeviceUUID(), "10:51",  false, "Audio", 10);
-                            != PackageManager.PERMISSION_GRANTED
+            }
-                            || ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
+        });
-                            != PackageManager.PERMISSION_GRANTED
+        videodetectionButton.setOnClickListener(new View.OnClickListener() {
-                            || ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.RECORD_AUDIO)
+            @Override
-                            != PackageManager.PERMISSION_GRANTED) {
+            public void onClick(View v) {
-                        ActivityCompat.requestPermissions(MainActivity.this,
+                if (mMainActivityViewModel.isCameraAccessAllowed(MainActivity.this)) {
-                                new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.RECORD_AUDIO},
+                    openVideodetectionActivity();
-                                REQUEST_PERMISSION);
+                }
-                    } else {
+                else {
-                        isRecording = true;
+                    mMainActivityViewModel.accessRequestCamera(MainActivity.this);
-                        alarmRecorder.startRecording();
+                }
-                    }
+            }
+        });
+        accelerometerButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                openAccelerometerActivity();
+                mMainActivityViewModel.setSensorType(mMainActivityViewModel.getLocalDeviceUUID(), "Accelerometer");
+            }
+        });
+        audiodetectionAndAccelerometerButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                //openAudiodetectionAndAccelerometerActivity();
+                mMainActivityViewModel.setSensorType(mMainActivityViewModel.getLocalDeviceUUID(), "AudiodetectionAndAccelerometer");
+                mMainActivityViewModel.setTimeStamp(mMainActivityViewModel.getLocalDeviceUUID(), "00:00");
+                mMainActivityViewModel.setDeviceID(mMainActivityViewModel.getLocalDeviceUUID(), "6789");
+            }
+        });
+        videodetectionAndAccelerometerButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                openVideodetectionAndAccelerometerActivity();
+            }
+        });
+        connectionButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.INTERNET) != PackageManager.PERMISSION_GRANTED
+                        || ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_WIFI_STATE) != PackageManager.PERMISSION_GRANTED
+                        || ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CHANGE_WIFI_MULTICAST_STATE) != PackageManager.PERMISSION_GRANTED) {
+
+                    ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.INTERNET, Manifest.permission.ACCESS_WIFI_STATE, Manifest.permission.CHANGE_WIFI_MULTICAST_STATE}, REQUEST_PERMISSION_INTERNET);
                 } else {
-                    isRecording = false;
+                    openConnectionActivity();
-                    alarmRecorder.stopRecording();
                 }
             }
         });
     }
-
+    public void openAudiodetectionActivity(){
-    @Override
+        Intent intent = new Intent(this, AudiodetectionActivity.class);
-    public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int width, int height) {
+        startActivity(intent);
-        alarmRecorder = new AlarmRecorder(surfaceTexture);
     }
-
+    public void openVideodetectionActivity(){
-    @Override
+        Intent intent =  new Intent(this, VideodetectionActivity.class);
-    public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
+        startActivity(intent);
-        // Die Größe der SurfaceTexture hat sich geändert
-        // Hier können entsprechende Anpassungen vorgenommen werden
     }
-
+    public void openAccelerometerActivity(){
-    @Override
+        Intent intent = new Intent(this, AccelerometerActivity.class);
-    public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
+        startActivity(intent);
-        // SurfaceTexture wurde zerstört
-        // Hier können entsprechende Bereinigungen durchgeführt werden
-        return true;
     }
-
+    public void openAudiodetectionAndAccelerometerActivity(){
-    @Override
+        Intent intent = new Intent(this, AudiodetectionAndAccelerometerActivity.class);
-    public void onSurfaceTextureUpdated(SurfaceTexture surface) {
+        startActivity(intent);
-        // SurfaceTexture wurde aktualisiert
-        // Hier können entsprechende Aktionen ausgeführt werden, wenn gewünscht
     }
-
+    public void openVideodetectionAndAccelerometerActivity(){
-    private SurfaceTexture getSurfaceTexture() {
+        Intent intent = new Intent(this, VideodetectionAndAccelerometerActivity.class);
-        return textureView.getSurfaceTexture();
+        startActivity(intent);
+    }
+    public void openConnectionActivity(){
+        //Intent intent = new Intent(this, ConnectionActivity.class);
+        //startActivity(intent);
+        mMainActivityViewModel.updateDevice(mMainActivityViewModel.getLocalDeviceUUID(), "10:51",  true, "Audio", 10);
     }
 
     @Override
     public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
         super.onRequestPermissionsResult(requestCode, permissions, grantResults);
-        if (requestCode == REQUEST_PERMISSION) {
+        if (requestCode == REQUEST_PERMISSION_INTERNET) {
             if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                 // Berechtigungen wurden gewährt
                 Toast.makeText(this, "Berechtigungen gewährt", Toast.LENGTH_SHORT).show();
-                isRecording = true;
+                openConnectionActivity();
-                alarmRecorder.startRecording();
             } else {
                 // Berechtigungen wurden nicht gewährt
                 Toast.makeText(this, "Berechtigungen nicht gewährt", Toast.LENGTH_SHORT).show();
             }
         }
     }
+
+
 }

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

@@ -0,0 +1,4 @@
+package com.example.greenwatch;
+
+public class Mikrofon {
+}

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

@@ -1,39 +0,0 @@
-package com.example.greenwatch;
-
-import android.media.MediaRecorder;
-import android.view.Surface;
-import android.view.SurfaceHolder;
-
-import java.io.IOException;
-
-public class VideoRecorder implements Runnable{
-    private final MediaRecorder videoRecorder;
-    private final String videoPath;
-    //private SurfaceHolder previewHolder;
-    private Surface surface;
-
-
-    public VideoRecorder(MediaRecorder videoRecorder, String videoPath, Surface surface) {
-        this.videoRecorder = videoRecorder;
-        this.videoPath = videoPath;
-        this.surface = surface;
-    }
-    @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);
-        videoRecorder.setPreviewDisplay(surface);
-
-        try {
-            videoRecorder.prepare();
-            videoRecorder.start();
-
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-    }
-}
-

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

@@ -0,0 +1,109 @@
+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.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+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;
+
+import java.util.List;
+import java.util.concurrent.ExecutionException;
+
+public class VideodetectionActivity extends AppCompatActivity {
+
+    private Button backToMainActivity;
+    private VideodetectionViewModel mVideoDetectionViewModel;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_videodetection);
+
+        backToMainActivity = (Button) findViewById(R.id.videodetectorBackToMainActivity);
+
+        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();
+            }
+        });
+
+        mVideoDetectionViewModel = new ViewModelProvider(this).get(VideodetectionViewModel.class);
+        mVideoDetectionViewModel.init();
+        mVideoDetectionViewModel.getConnectedDeviceList().observe(this, new Observer<List<Device>>() {
+            @Override
+            public void onChanged(List<Device> devices) {
+                deviceListAdapter.setDevices(devices);
+            }
+        });
+
+        mVideoDetectionViewModel.getAlarmHistoryList().observe(this, new Observer<List<Device>>() {
+            @Override
+            public void onChanged(List<Device> devices) {
+                alarmHistoryListAdapter.setAlarmHistoryList(devices);
+            }
+        });
+
+        mVideoDetectionViewModel.getStartAlarmRecording().observe(this, new Observer<Boolean>() {
+            @Override
+            public void onChanged(Boolean aBoolean) {
+                if (aBoolean) {
+                    Toast.makeText(VideodetectionActivity.this, "Start Alarm Recording", Toast.LENGTH_LONG).show();
+                }
+                else {
+                    Toast.makeText(VideodetectionActivity.this, "Stop Alarm Recording", Toast.LENGTH_LONG).show();
+                }
+            }
+        });
+
+        mVideoDetectionViewModel.getVideoAlarmDetectedValue().observe(this, new Observer<Boolean>() {
+            @Override
+            public void onChanged(Boolean aBoolean) {
+                if (aBoolean) {
+                    mVideoDetectionViewModel.updateDevice(mVideoDetectionViewModel.getLocalDeviceUUID(), mVideoDetectionViewModel.getSystemTimeStamp(), true, "Video", 10);
+                }
+                else {
+                    mVideoDetectionViewModel.updateDevice(mVideoDetectionViewModel.getLocalDeviceUUID(), mVideoDetectionViewModel.getSystemTimeStamp(), false, "Video", 0);
+                }
+
+            }
+        });
+
+        final ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(this);
+        cameraProviderFuture.addListener(() -> {
+            try {
+                mVideoDetectionViewModel.bindImageAnalysis(cameraProviderFuture.get(), this, this);
+            } catch (ExecutionException | InterruptedException e) {
+                e.printStackTrace();
+            }
+        }, ContextCompat.getMainExecutor(this));
+    }
+}

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

@@ -0,0 +1,171 @@
+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;
+
+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/adapters/AlarmHistoryListAdapter.java

@@ -0,0 +1,62 @@
+package com.example.greenwatch.adapters;
+
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.example.greenwatch.R;
+import com.example.greenwatch.models.Device;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class AlarmHistoryListAdapter extends RecyclerView.Adapter<AlarmHistoryListAdapter.AlarmHistoryListHolder> {
+    private List<Device> alarmHistoryList = new ArrayList<>();
+
+
+    @NonNull
+    @Override
+    public AlarmHistoryListHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        View itemView = LayoutInflater.from(parent.getContext())
+                .inflate(R.layout.alarm_history_item, parent, false);
+        return new AlarmHistoryListHolder(itemView);
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull AlarmHistoryListHolder holder, int position) {
+        Device currentDevice = alarmHistoryList.get(position);
+        holder.textViewSensorType.setText(holder.itemView.getContext().getString(R.string.sensor_type_placeholder, currentDevice.getSensorType()));
+        holder.textViewDeviceID.setText(holder.itemView.getContext().getString(R.string.deviceID_placeholder, currentDevice.getDeviceID()));
+        holder.textViewTimeStamp.setText(holder.itemView.getContext().getString(R.string.sensor_time_stamp_placeholder, currentDevice.getTimeStamp()));
+        holder.textViewSensorMessage.setText(holder.itemView.getContext().getString(R.string.sensor_message_placeholder, currentDevice.getSensorMassage()));
+    }
+
+    @Override
+    public int getItemCount() {
+        return alarmHistoryList.size();
+    }
+
+    public void setAlarmHistoryList(List<Device> alarmHistoryList) {
+        this.alarmHistoryList = alarmHistoryList;
+        notifyDataSetChanged();
+    }
+
+    class AlarmHistoryListHolder extends RecyclerView.ViewHolder {
+        private TextView textViewSensorType;
+        private TextView textViewDeviceID;
+        private TextView textViewTimeStamp;
+        private TextView textViewSensorMessage;
+
+        public AlarmHistoryListHolder(View itemView) {
+            super(itemView);
+            textViewSensorType = (TextView) itemView.findViewById(R.id.tvAlarmHistoryDeviceSensorType);
+            textViewDeviceID = (TextView) itemView.findViewById(R.id.tvAlarmHistoryDeviceID);
+            textViewTimeStamp = (TextView) itemView.findViewById(R.id.tvAlarmHistoryDeviceTimeStamp);
+            textViewSensorMessage = (TextView) itemView.findViewById(R.id.tvAlarmHistoryDeviceSensorMassage);
+        }
+    }
+}

app/src/main/java/com/example/greenwatch/adapters/DeviceListAdapter.java

@@ -0,0 +1,92 @@
+package com.example.greenwatch.adapters;
+
+import android.graphics.Color;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.example.greenwatch.R;
+import com.example.greenwatch.models.Device;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+public class DeviceListAdapter extends RecyclerView.Adapter<DeviceListAdapter.DeviceListHolder> {
+    private List<Device> devices = new ArrayList<>();
+
+
+    @NonNull
+    @Override
+    public DeviceListHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        View itemView = LayoutInflater.from(parent.getContext())
+                .inflate(R.layout.device_item, parent, false);
+        return new DeviceListHolder(itemView);
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull DeviceListHolder holder, int position) {
+        Device currentDevice = devices.get(position);
+        holder.textViewSensorType.setText(holder.itemView.getContext().getString(R.string.sensor_type_placeholder, currentDevice.getSensorType()));
+        holder.textViewDeviceID.setText(holder.itemView.getContext().getString(R.string.deviceID_placeholder, currentDevice.getDeviceID()));
+        holder.textViewTimeStamp.setText(holder.itemView.getContext().getString(R.string.sensor_time_stamp_placeholder, currentDevice.getTimeStamp()));
+        holder.textViewSensorMessage.setText(holder.itemView.getContext().getString(R.string.sensor_message_placeholder, currentDevice.getSensorMassage()));
+        holder.setDeviceSensorStatus(currentDevice);
+    }
+
+    @Override
+    public int getItemCount() {
+        return devices.size();
+    }
+
+    public void setDevices(List<Device> devices) {
+        this.devices = devices;
+        Collections.sort(this.devices, new Comparator<Device>() {
+
+            @Override
+            public int compare(Device device1, Device device2) {
+                if (device1.getSensorStatus() && !device2.getSensorStatus()) {
+                    return -1;
+                } else if (!device1.getSensorStatus() && device2.getSensorStatus()) {
+                    return 1;
+                } else {
+                    return 0;
+                }
+            }
+        });
+        notifyDataSetChanged();
+    }
+
+    class DeviceListHolder extends RecyclerView.ViewHolder {
+        private TextView textViewSensorType;
+        private TextView textViewSensorStatus;
+        private TextView textViewDeviceID;
+        private TextView textViewTimeStamp;
+        private TextView textViewSensorMessage;
+
+        public DeviceListHolder(View itemView) {
+            super(itemView);
+            textViewSensorType = (TextView) itemView.findViewById(R.id.tvDeviceSensorType);
+            textViewSensorStatus = (TextView) itemView.findViewById(R.id.tvDeviceSensorStatus);
+            textViewDeviceID = (TextView) itemView.findViewById(R.id.tvDeviceID);
+            textViewTimeStamp = (TextView) itemView.findViewById(R.id.tvDeviceTimeStamp);
+            textViewSensorMessage = (TextView) itemView.findViewById(R.id.tvDeviceSensorMassage);
+        }
+
+        public void setDeviceSensorStatus(Device device) {
+            if (device.getSensorStatus()) {
+                textViewSensorStatus.setText(itemView.getContext().getString(R.string.sensor_status_placeholder, "AN"));
+                itemView.setBackgroundColor(Color.RED);
+            }
+            else {
+                textViewSensorStatus.setText(itemView.getContext().getString(R.string.sensor_status_placeholder, "AUS"));
+                itemView.setBackgroundColor(Color.WHITE);
+            }
+        }
+    }
+}

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

@@ -0,0 +1,133 @@
+package com.example.greenwatch.communication;
+
+import com.example.greenwatch.repositories.DeviceRepository;
+
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.Inet4Address;
+import java.net.InetAddress;
+import java.net.NetworkInterface;
+import java.net.SocketException;
+import java.net.UnknownHostException;
+import java.util.Enumeration;
+
+public class WiFiCommunication {
+
+    private final InetAddress address;
+    private final DatagramSocket socket;
+    private final int port;
+    private String rxString;
+    private String sendMessage;
+    //private String sendMsg = "default";
+    private boolean isNewMessage;
+    volatile private boolean running;
+    private static WiFiCommunication wifiCommunicationInstance;
+    private DeviceRepository mDeviceRepository;
+
+    private WiFiCommunication() {
+        port = 1234;
+        try {
+            socket = new DatagramSocket(port);
+            socket.setBroadcast(true);
+            address = InetAddress.getByName("255.255.255.255");
+            running = true;
+            isNewMessage = false;
+            new ReceiveThread().start();
+            new SendThread().start();
+        } catch (SocketException | UnknownHostException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static synchronized WiFiCommunication getInstance() {
+        if (wifiCommunicationInstance == null){
+            wifiCommunicationInstance = new WiFiCommunication();
+        }
+        return wifiCommunicationInstance;
+    }
+
+    public void setDeviceRepository(DeviceRepository deviceRepository) {
+        this.mDeviceRepository = deviceRepository;
+    }
+
+    public void setNewMessage(String newMessage, boolean isNewMessage){
+        this.sendMessage = newMessage;
+        this.isNewMessage = isNewMessage;
+    }
+
+    public static String getLocalIpAddress() {
+        try {
+            for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
+                NetworkInterface networkInterface = (NetworkInterface) ((Enumeration<?>) en).nextElement();
+                for (Enumeration<InetAddress> addresses = networkInterface.getInetAddresses(); addresses.hasMoreElements();) {
+                    InetAddress inetAddress = addresses.nextElement();
+                    if (!inetAddress.isLoopbackAddress() && inetAddress instanceof Inet4Address) {
+                        return inetAddress.getHostAddress();
+                    }
+                }
+            }
+        } catch (SocketException ex) {
+            ex.printStackTrace();
+        }
+        return null;
+    }
+
+    public void stopCommunication() {
+        running = false;
+        socket.close();
+    }
+
+    private class SendThread extends Thread {
+        private int tmpCnt = 0;
+        @Override
+        public void run() {
+            try {
+                do {
+
+                    if(isNewMessage)
+                    {
+                        isNewMessage = false;
+                        //todo: adapt send String
+                        String txString = getLocalIpAddress() + " sends. #" + tmpCnt++ + sendMessage;
+                        byte[] txBuffer = txString.getBytes();
+
+                        DatagramPacket txPacket = new DatagramPacket(txBuffer, txBuffer.length, address, port);
+
+                        for(int i = 0; i < 20; i++) {
+                            socket.send(txPacket);
+                        }
+                    }
+                } while (running);
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    private class ReceiveThread extends Thread {
+        private String rxString = "";
+        private String previousRxString = "";
+        @Override
+        public void run() {
+            try {
+                do {
+                    byte[] rxBuffer = new byte[1024];
+                    DatagramPacket packet = new DatagramPacket(rxBuffer, rxBuffer.length);
+                    socket.receive(packet);
+                    rxString = new String(packet.getData(), 0, packet.getLength());
+
+                    if(!previousRxString.equals(rxString)){
+                        mDeviceRepository.getNewReceivedMessage(rxString);
+
+                    }
+                    previousRxString = rxString;
+
+                } while (running);
+            }
+            catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+}

app/src/main/java/com/example/greenwatch/models/Device.java

@@ -0,0 +1,57 @@
+package com.example.greenwatch.models;
+
+
+public class Device {
+
+    private String timeStamp;
+    private String deviceID;
+    private boolean sensorStatus;
+    private String sensorType;
+    private int sensorMassage;
+
+    public Device(String timeStamp, String deviceID, boolean sensorStatus, String sensorType, int sensorMassage) {
+        this.timeStamp = timeStamp;
+        this.deviceID = deviceID;
+        this.sensorStatus = sensorStatus;
+        this.sensorType = sensorType;
+        this.sensorMassage = sensorMassage;
+    }
+    public void setTimeStamp(String timeStamp) {
+        this.timeStamp = timeStamp;
+    }
+
+    public String getTimeStamp() {
+        return timeStamp;
+    }
+
+    public void setDeviceID(String deviceID) {
+        this.deviceID = deviceID;
+    }
+
+    public String getDeviceID() {
+        return deviceID;
+    }
+    public void setSensorType(String sensorType) {
+        this.sensorType = sensorType;
+    }
+
+    public String getSensorType() {
+        return sensorType;
+    }
+
+    public void setSensorStatus(boolean sensorStatus) {
+        this.sensorStatus = sensorStatus;
+    }
+
+    public Boolean getSensorStatus() {
+        return sensorStatus;
+    }
+
+    public void setSensorMassage(int sensorMassage) {
+        this.sensorMassage = sensorMassage;
+    }
+
+    public int getSensorMassage() {
+        return sensorMassage;
+    }
+}

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

@@ -0,0 +1,322 @@
+package com.example.greenwatch.repositories;
+
+
+import androidx.lifecycle.MutableLiveData;
+
+import com.example.greenwatch.models.Device;
+import com.example.greenwatch.communication.WiFiCommunication;
+
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.List;
+import java.util.UUID;
+
+public class DeviceRepository {
+
+    private final int maxAlarmHistoryListSize = 20;
+    private final String delimiter = ", ";
+    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<>();
+    private HashMap<String, String> deviceIDMapper = new HashMap<>();
+    private List<Device> alarmHistoryDeviceList = new ArrayList<>();
+
+    private DeviceRepository() {
+        setLocalDeviceUUID();
+        startAlarmRecordingValue = false;
+    }
+
+    public static synchronized DeviceRepository getInstance() {
+        if (deviceRepositoryInstance == null){
+            deviceRepositoryInstance = new DeviceRepository();
+        }
+        return deviceRepositoryInstance;
+    }
+
+    public void setWiFiCommunication(WiFiCommunication wiFiCommunication) {
+        this.mWiFiCommunication = wiFiCommunication;
+    }
+
+    public MutableLiveData<List<Device>> getConnectedDeviceList() {
+        setMutableLiveDataDeviceList();
+        return deviceList;
+    }
+
+    public MutableLiveData<List<Device>> getAlarmHistoryDeviceList() {
+        setMutableLiveDataAlarmHistoryList();
+        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();
+    }
+
+    public void getNewReceivedMessage(String newMessage) {
+        String[] messageString = messageStringSplitter(newMessage);
+        String timeStamp = messageString[0];
+        String deviceID = messageString[1];
+        boolean sensorStatus = convertSensorStatus(messageString[2]);
+        String sensorType = messageString[3];
+        int sensorMassage = Integer.valueOf(messageString[4]);
+
+        if (deviceID.equals(checkDeviceID(localDeviceUUID))) {
+            return;
+        }
+
+        if(!connectedDevicesList.containsKey(deviceID)) {
+            createNewDevice(timeStamp, deviceID, sensorStatus, sensorType, sensorMassage);
+        }
+        else {
+            updateDevice(deviceID, timeStamp, sensorStatus, sensorType, sensorMassage);
+        }
+    }
+
+    private String messageStringBuilder(String deviceID) {
+        StringBuilder message = new StringBuilder();
+        Device device = connectedDevicesList.get(deviceID);
+        if(device != null) {
+            message.append(device.getTimeStamp())
+                    .append(delimiter)
+                    .append(device.getDeviceID())
+                    .append(delimiter)
+                    .append(device.getSensorStatus())
+                    .append(delimiter)
+                    .append(device.getSensorType())
+                    .append(delimiter)
+                    .append(device.getSensorMassage());
+        }
+        else {
+            message.append("")
+                    .append(delimiter)
+                    .append("")
+                    .append(delimiter)
+                    .append("")
+                    .append(delimiter)
+                    .append("")
+                    .append(delimiter)
+                    .append("");
+        }
+        return message.toString();
+    }
+
+    public String getLocalDeviceUUID() {
+        return localDeviceUUID;
+    }
+
+    public void updateDevice(String deviceID, String timeStamp, boolean sensorStatus, String sensorType, int sensorMassage) {
+        String checkedDeviceID = checkDeviceID(deviceID);
+        Device device = connectedDevicesList.get(checkedDeviceID);
+        if(device != null) {
+            device.setTimeStamp(timeStamp);
+            device.setSensorType(sensorType);
+            device.setSensorMassage(sensorMassage);
+            if (!device.getSensorStatus() && sensorStatus) {
+                setAlarmHistoryDeviceList(device);
+            }
+            device.setSensorStatus(sensorStatus);
+            boolean newStartAlarmRecordingValue = checkDeviceStatus();
+            if (startAlarmRecordingValue != newStartAlarmRecordingValue) {
+                startAlarmRecordingValue = newStartAlarmRecordingValue;
+                setMutableLiveDataStartAlarmRecording();
+            }
+            addToConnectedDeviceList(checkedDeviceID, device);
+            setMutableLiveDataDeviceList();
+        }
+    }
+
+    public void setTimeStamp(String deviceID, String timeStamp) {
+        String checkedDeviceID = checkDeviceID(deviceID);
+        Device device = connectedDevicesList.get(checkedDeviceID);
+        if(device != null) {
+            device.setTimeStamp(timeStamp);
+            addToConnectedDeviceList(checkedDeviceID, device);
+            setMutableLiveDataDeviceList();
+        }
+    }
+
+    public String getTimeStamp(String deviceID) {
+        String checkedDeviceID = checkDeviceID(deviceID);
+        Device device = connectedDevicesList.get(checkedDeviceID);
+        if(device != null) {
+            return device.getTimeStamp();
+        }
+        return "";
+    }
+
+    public void setDeviceID(String deviceID, String newDeviceID) {
+        String checkedDeviceID = checkDeviceID(deviceID);
+        Device device = connectedDevicesList.get(checkedDeviceID);
+        if(device != null) {
+            device.setDeviceID(newDeviceID);
+            setDeviceIDMapper(newDeviceID);
+            connectedDevicesList.remove(checkedDeviceID);
+            addToConnectedDeviceList(newDeviceID, device);
+            setMutableLiveDataDeviceList();
+        }
+    }
+
+    public String getDeviceID(String deviceID) {
+        String checkedDeviceID = checkDeviceID(deviceID);
+        Device device = connectedDevicesList.get(checkedDeviceID);
+        if(device != null) {
+            return device.getDeviceID();
+        }
+        return "";
+    }
+
+    public void setSensorStatus(String deviceID, boolean sensorStatus) {
+        String checkedDeviceID = checkDeviceID(deviceID);
+        Device device = connectedDevicesList.get(checkedDeviceID);
+        if(device != null) {
+            if (!device.getSensorStatus() && sensorStatus) {
+                setAlarmHistoryDeviceList(device);
+            }
+            device.setSensorStatus(sensorStatus);
+            boolean newStartAlarmRecordingValue = checkDeviceStatus();
+            if (startAlarmRecordingValue != newStartAlarmRecordingValue) {
+                startAlarmRecordingValue = newStartAlarmRecordingValue;
+                setMutableLiveDataStartAlarmRecording();
+            }
+            addToConnectedDeviceList(checkedDeviceID, device);
+            setMutableLiveDataDeviceList();
+
+        }
+    }
+
+    public boolean getSensorStatus(String deviceID) {
+        String checkedDeviceID = checkDeviceID(deviceID);
+        Device device = connectedDevicesList.get(checkedDeviceID);
+        if(device != null) {
+            return device.getSensorStatus();
+        }
+        return false;
+    }
+
+    public void setSensorType(String deviceID, String sensorType) {
+        String checkedDeviceID = checkDeviceID(deviceID);
+        Device device = connectedDevicesList.get(checkedDeviceID);
+        if(device != null) {
+            device.setSensorType(sensorType);
+            addToConnectedDeviceList(checkedDeviceID, device);
+            setMutableLiveDataDeviceList();
+        }
+    }
+
+    public String getSensorType(String deviceID) {
+        String checkedDeviceID = checkDeviceID(deviceID);
+        Device device = connectedDevicesList.get(checkedDeviceID);
+        if(device != null) {
+            return device.getSensorType();
+        }
+        return "";
+    }
+
+    public void setSensorMassage(String deviceID, int sensorMessage) {
+        String checkedDeviceID = checkDeviceID(deviceID);
+        Device device = connectedDevicesList.get(checkedDeviceID);
+        if(device != null) {
+            device.setSensorMassage(sensorMessage);
+            addToConnectedDeviceList(checkedDeviceID, device);
+            setMutableLiveDataDeviceList();
+        }
+    }
+
+    public int getSensorMassage(String deviceID) {
+        String checkedDeviceID = checkDeviceID(deviceID);
+        Device device = connectedDevicesList.get(checkedDeviceID);
+        if(device != null) {
+            return device.getSensorMassage();
+        }
+        return 0;
+    }
+
+    public String getSystemTimeStamp() {
+        SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss");
+        Date date = new Date(System.currentTimeMillis());
+        return formatter.format(date);
+    }
+
+    private void setMutableLiveDataDeviceList() {
+        List<Device> list = new ArrayList<>(connectedDevicesList.values());
+        deviceList.setValue(list);
+    }
+
+    private void setMutableLiveDataAlarmHistoryList() {
+        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))) {
+            mWiFiCommunication.setNewMessage(messageStringBuilder(device.getDeviceID()),true);
+        }
+    }
+
+    private String checkDeviceID(String deviceID) {
+        if(!deviceIDMapper.isEmpty() && deviceID.equals(localDeviceUUID)) {
+            return deviceIDMapper.get(deviceID);
+        }
+        return deviceID;
+    }
+
+    private void setDeviceIDMapper(String deviceID) {
+        deviceIDMapper.put(localDeviceUUID, deviceID);
+    }
+
+    private void setLocalDeviceUUID(){
+        this.localDeviceUUID = UUID.randomUUID().toString();
+    }
+
+    private String[] messageStringSplitter(String message) {
+        return message.split(delimiter);
+    }
+
+    private boolean convertSensorStatus(String status) {
+        return status.equals(sensorStatusKey);
+    }
+
+    private void setAlarmHistoryDeviceList(Device device) {
+        if (alarmHistoryDeviceList.size() == maxAlarmHistoryListSize) {
+            alarmHistoryDeviceList.remove(alarmHistoryDeviceList.size() -1);
+        }
+        Device alarmHistoryDevice = new Device(device.getTimeStamp(), device.getDeviceID(), device.getSensorStatus(), device.getSensorType(), device.getSensorMassage());
+        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

@@ -0,0 +1,126 @@
+package com.example.greenwatch.sensors;
+
+import android.content.Context;
+import android.graphics.ImageFormat;
+import android.media.Image;
+import android.util.Size;
+
+import androidx.camera.core.CameraSelector;
+import androidx.camera.core.ImageAnalysis;
+import androidx.camera.lifecycle.ProcessCameraProvider;
+import androidx.core.content.ContextCompat;
+import androidx.lifecycle.LifecycleOwner;
+import androidx.lifecycle.MutableLiveData;
+
+import java.nio.ByteBuffer;
+
+public class CameraSensor {
+    private final MutableLiveData<Boolean> mVideoAlarmDetected = new MutableLiveData<>();
+    private static CameraSensor cameraSensorInstance;
+    private boolean videoAlarmDetected;
+    private ByteBuffer previousBuffer;
+    private int previousWidth;
+    private int previousHeight;
+
+    private CameraSensor() {
+        videoAlarmDetected = false;
+    }
+
+    public static synchronized CameraSensor getInstance() {
+        if (cameraSensorInstance == null){
+            cameraSensorInstance = new CameraSensor();
+        }
+        return cameraSensorInstance;
+    }
+
+    public MutableLiveData<Boolean> getVideoAlarmDetectedValue() {
+        setMutableLiveDataVideoAlarmDetected();
+        return mVideoAlarmDetected;
+    }
+
+    private void setMutableLiveDataVideoAlarmDetected() {
+        mVideoAlarmDetected.setValue(videoAlarmDetected);
+    }
+
+    public void bindImageAnalysis(ProcessCameraProvider cameraProvider, LifecycleOwner lifecycleOwner, Context context) {
+        ImageAnalysis.Builder builder = new ImageAnalysis.Builder();
+        builder.setTargetResolution(new Size(640, 480));
+        builder.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST);
+        ImageAnalysis imageAnalysis = builder.build();
+        imageAnalysis.setAnalyzer(
+                ContextCompat.getMainExecutor(context),
+                imageProxy -> {
+
+                    int imageFormat = imageProxy.getFormat();
+
+                    if (imageFormat == ImageFormat.YUV_420_888) {
+
+                        Image currentImage = imageProxy.getImage();
+
+                        if (previousHeight != 0) {
+                            assert currentImage != null;
+                            videoAlarmDetected = compareFrames(currentImage);
+                        }
+
+                        assert currentImage != null;
+                        Image.Plane[] planes = currentImage.getPlanes();
+                        ByteBuffer buffer = planes[0].getBuffer().duplicate();
+                        previousBuffer = ByteBuffer.allocateDirect(buffer.remaining());
+                        previousBuffer.put(buffer);
+                        previousWidth = currentImage.getWidth();
+                        previousHeight = currentImage.getHeight();
+
+                        currentImage.close();
+
+                        checkAlarmCondition();
+
+                    }
+
+                    imageProxy.close();
+                });
+
+        CameraSelector cameraSelector = new CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build();
+
+        cameraProvider.bindToLifecycle(lifecycleOwner, cameraSelector, imageAnalysis);
+    }
+
+    private boolean compareFrames(Image currentImage) {
+
+        ByteBuffer currentBuffer = currentImage.getPlanes()[0].getBuffer();
+
+        int currentWidth = currentImage.getWidth();
+        int currentHeight = currentImage.getHeight();
+
+        if (previousWidth != currentWidth || previousHeight != currentHeight) {
+            return false;
+        }
+
+        for (int row = 0; row < previousHeight; row++) {
+            for (int col = 0; col < previousWidth; col++) {
+
+                int previousIndex = row * previousWidth + col;
+                int currentIndex = row * currentWidth + col;
+
+                int previousPixel = previousBuffer.get(previousIndex) & 0xFF;
+                int currentPixel = currentBuffer.get(currentIndex) & 0xFF;
+
+                int pixelDifference = Math.abs(previousPixel - currentPixel);
+                int threshold = 120;
+
+                if (pixelDifference > threshold) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
+    public void checkAlarmCondition() {
+        if (videoAlarmDetected && !mVideoAlarmDetected.getValue()) {
+            setMutableLiveDataVideoAlarmDetected();
+        }
+        else if (!videoAlarmDetected && mVideoAlarmDetected.getValue()){
+            setMutableLiveDataVideoAlarmDetected();
+        }
+    }
+}

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

@@ -0,0 +1,143 @@
+package com.example.greenwatch.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.greenwatch.models.Device;
+import com.example.greenwatch.repositories.DeviceRepository;
+import com.example.greenwatch.sensors.AccelerometerSensor;
+
+import java.util.List;
+
+public class AccelerometerViewModel extends ViewModel implements ViewModelInterface {
+
+    private MutableLiveData<List<Device>> mDeviceList;
+    private MutableLiveData<Boolean> mAccelerometerAlarmDetected;
+    private MutableLiveData<List<Device>> mAlarmHistoryList;
+    private MutableLiveData<Boolean> mStartAlarmRecording;
+    private AccelerometerSensor mAccelerometerSensor;
+    private DeviceRepository mDeviceRepository;
+
+    @Override
+    public void init() {
+        if (mDeviceRepository == null) {
+            mDeviceRepository = DeviceRepository.getInstance();
+        }
+        if (mAccelerometerSensor == null) {
+            mAccelerometerSensor = AccelerometerSensor.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();
+        }
+    }
+
+    public void addValueToGesamtBE(float newValue) {
+        mAccelerometerSensor.addValueToGesamtBE(newValue);
+    }
+
+    public void meanValueCalculation() {
+        mAccelerometerSensor.meanValueCalculation();
+    }
+
+    public void calibrateAccelerometerSensor() {
+        mAccelerometerSensor.calibrateAccelerometerSensor();
+    }
+
+    public void checkAlarmCondition() {
+        mAccelerometerSensor.checkAlarmCondition();
+    }
+
+    public LiveData<Boolean> getAccelerometerAlarmDetected() {
+        return mAccelerometerAlarmDetected;
+    }
+
+    @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/MainActivityViewModel.java

@@ -0,0 +1,131 @@
+package com.example.greenwatch.viewmodels;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.pm.PackageManager;
+
+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.communication.WiFiCommunication;
+import com.example.greenwatch.models.Device;
+import com.example.greenwatch.repositories.DeviceRepository;
+
+import java.util.List;
+
+public class MainActivityViewModel extends ViewModel implements ViewModelInterface {
+
+    private MutableLiveData<List<Device>> mDeviceList;
+    private MutableLiveData<List<Device>> mAlarmHistoryList;
+    private MutableLiveData<Boolean> mStartAlarmRecording;
+    private DeviceRepository mDeviceRepository;
+    private static final int RIGHTS_REQUEST_CAMERA = 10;
+
+    @Override
+    public void init() {
+        WiFiCommunication mWiFiCommunication;
+        if(mDeviceList != null) {
+            return;
+        }
+        //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);
+        mDeviceList = mDeviceRepository.getConnectedDeviceList();
+        mAlarmHistoryList = mDeviceRepository.getAlarmHistoryDeviceList();
+        mStartAlarmRecording = mDeviceRepository.getStartAlarmRecording();
+    }
+
+    public boolean isCameraAccessAllowed(Context context) {
+        return ContextCompat.checkSelfPermission(context, android.Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED;
+    }
+
+    public void accessRequestCamera(Activity activity) {
+        ActivityCompat.requestPermissions(activity, new String[]{android.Manifest.permission.CAMERA}, RIGHTS_REQUEST_CAMERA);
+    }
+
+    @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 null;
+    }
+}

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

@@ -0,0 +1,140 @@
+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.ViewModel;
+
+import com.example.greenwatch.models.Device;
+import com.example.greenwatch.repositories.DeviceRepository;
+import com.example.greenwatch.sensors.CameraSensor;
+
+import java.util.List;
+
+public class VideodetectionViewModel extends ViewModel implements ViewModelInterface {
+
+    private MutableLiveData<List<Device>> mDeviceList;
+    private MutableLiveData<Boolean> mVideoAlarmDetected;
+    private MutableLiveData<List<Device>> mAlarmHistoryList;
+    private MutableLiveData<Boolean> mStartAlarmRecording;
+    private DeviceRepository mDeviceRepository;
+    private CameraSensor mCameraSensor;
+
+
+    public LiveData<Boolean> getVideoMovementDetectedValue() {
+        return mVideoAlarmDetected;
+    }
+
+    @Override
+    public void init() {
+        if (mDeviceRepository == null) {
+            mDeviceRepository = DeviceRepository.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 (mVideoAlarmDetected == null) {
+            mVideoAlarmDetected = mCameraSensor.getVideoAlarmDetectedValue();
+        }
+    }
+
+    public void bindImageAnalysis(ProcessCameraProvider cameraProvider, LifecycleOwner lifecycleOwner, Context context) {
+        mCameraSensor.bindImageAnalysis(cameraProvider, lifecycleOwner, context);
+    }
+
+    public LiveData<Boolean> getVideoAlarmDetectedValue() {
+        return mVideoAlarmDetected;
+    }
+
+    @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/ViewModelInterface.java

@@ -0,0 +1,27 @@
+package com.example.greenwatch.viewmodels;
+
+import androidx.lifecycle.LiveData;
+
+import com.example.greenwatch.models.Device;
+
+import java.util.List;
+
+public interface ViewModelInterface {
+    void init();
+    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);
+    void setDeviceID(String deviceID, String newDeviceID);
+    String getDeviceID(String deviceID);
+    void setSensorStatus(String deviceID, boolean sensorStatus);
+    boolean getSensorStatus(String deviceID);
+    void setSensorType(String deviceID, String sensorType);
+    String getSensorType(String deviceID);
+    void setSensorMassage(String deviceID, int sensorMessage);
+    int getSensorMassage(String deviceID);
+    String getLocalDeviceUUID();
+    String getSystemTimeStamp();
+}

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

@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:padding="10dp"
+    tools:context=".AccelerometerActivity">
+
+    <TextView
+        android:id="@+id/tvAccelerometerStatusmessage"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="">
+    </TextView>
+
+    <TextView
+        android:id="@+id/tvAccelerometerData"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="">
+    </TextView>
+
+    <TextView
+        android:id="@+id/tvAccelerometerWarning"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="">
+    </TextView>
+
+    <Button
+        android:id="@+id/accelerometerBackToMainActivity"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        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>

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

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:padding="10dp"
+    tools:context=".AudiodetectionActivity">
+
+    <TextView
+        android:id="@+id/tvAudiodetectionStatusmessage"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Audiodetection Activity">
+    </TextView>
+
+    <Button
+        android:id="@+id/audiodetectorBackToMainActivity"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Back to MainActivity">
+    </Button>
+
+</LinearLayout>

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

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:padding="10dp"
+    tools:context=".AudiodetectionAndAccelerometerActivity">
+
+    <TextView
+        android:id="@+id/tvAudiodetectionAndAccelerometerStatusmessage"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Audiodetection + Accelerometer Activity">
+    </TextView>
+
+    <Button
+        android:id="@+id/audiodetectionAndAccelerometerBackToMainActivity"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Back to MainActivity">
+    </Button>
+
+</LinearLayout>

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

@@ -1,31 +1,83 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:padding="10dp"
     tools:context=".MainActivity">
 
-    <TextureView
+    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/textureView"
+        android:id="@+id/alarmHistoryListRecyclerView"
-        android:layout_width="1sp"
+        android:layout_width="match_parent"
-        android:layout_height="1sp"
+        android:layout_height="match_parent"
-        android:visibility="visible"
+        android:layout_weight="3"
-        app:layout_constraintBottom_toBottomOf="parent"
+        tools:listitem="@layout/alarm_history_item">
-        app:layout_constraintEnd_toEndOf="parent"
+    </androidx.recyclerview.widget.RecyclerView>
-        app:layout_constraintHorizontal_bias="1.0"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/button"
-        app:layout_constraintVertical_bias="0.0" />
 
-    <Button
+    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/button"
+        android:id="@+id/deviceListRecyclerView"
-        android:layout_width="wrap_content"
+        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
+        android:layout_height="match_parent"
-        android:layout_marginEnd="339dp"
+        android:layout_weight="3"
-        android:text="Record Video"
+        tools:listitem="@layout/device_item">
-        app:layout_constraintHorizontal_bias="0.5"
+    </androidx.recyclerview.widget.RecyclerView>
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent"/>
     
-</androidx.constraintlayout.widget.ConstraintLayout>
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical"
+        android:layout_weight="3">
+
+        <Button
+            android:id="@+id/audiodetectionButton"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="Audiodetection">
+        </Button>
+
+        <Button
+            android:id="@+id/videodetectionButton"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="Videodetection">
+        </Button>
+
+        <Button
+            android:id="@+id/accelerometerButton"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="Accelerometer">
+        </Button>
+
+        <Button
+            android:id="@+id/audiodetectionAndAccelerometerButton"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="Audiodetection + Accelerometer">
+        </Button>
+
+        <Button
+            android:id="@+id/videodetectionAndAccelerometerButton"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="Videodetection + Accelerometer">
+        </Button>
+
+        <Button
+            android:id="@+id/connectionButton"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="Connect to Devices">
+        </Button>
+
+    </LinearLayout>
+
+</LinearLayout>

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

@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:padding="10dp"
+    tools:context=".VideodetectionActivity">
+
+    <TextView
+        android:id="@+id/tvVideodetectionStatusmessage"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Videodetection Activity">
+    </TextView>
+
+    <Button
+        android:id="@+id/videodetectorBackToMainActivity"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        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>

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

@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:padding="10dp"
+    tools:context=".VideodetectionAndAccelerometerActivity">
+
+    <TextView
+        android:id="@+id/tvvideodetectionAndAccelerometerStatusmessage"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        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
+        android:id="@+id/videodetectionAndAccelerometerBackToMainActivity"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        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>

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

@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_marginEnd="8dp"
+    android:layout_marginStart="8dp"
+    android:layout_marginTop="8dp">
+
+    <RelativeLayout
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:padding="8dp">
+
+        <TextView
+            android:id="@+id/tvAlarmHistoryDeviceSensorType"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/sensor_type_placeholder"
+            android:textAppearance="@style/TextAppearance.AppCompat.Large"
+            android:maxLines="1"
+            android:layout_alignParentStart="true"
+            android:ellipsize="end">
+        </TextView>
+
+        <TextView
+            android:id="@+id/tvAlarmHistoryDeviceID"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_below="@id/tvAlarmHistoryDeviceSensorType"
+            android:text="@string/deviceID_placeholder">
+        </TextView>
+
+        <TextView
+            android:id="@+id/tvAlarmHistoryDeviceTimeStamp"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_below="@id/tvAlarmHistoryDeviceID"
+            android:text="@string/sensor_time_stamp_placeholder">
+        </TextView>
+
+        <TextView
+            android:id="@+id/tvAlarmHistoryDeviceSensorMassage"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_below="@id/tvAlarmHistoryDeviceTimeStamp"
+            android:text="@string/sensor_message_placeholder">
+        </TextView>
+
+    </RelativeLayout>
+
+</androidx.cardview.widget.CardView>

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

@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_marginEnd="8dp"
+    android:layout_marginStart="8dp"
+    android:layout_marginTop="8dp">
+    
+    <RelativeLayout
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:padding="8dp">
+        
+        <TextView
+            android:id="@+id/tvDeviceSensorStatus"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_alignParentEnd="true"
+            android:text="@string/sensor_status_placeholder"
+            android:textAppearance="@style/TextAppearance.AppCompat.Large">
+        </TextView>
+
+        <TextView
+            android:id="@+id/tvDeviceSensorType"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/sensor_type_placeholder"
+            android:textAppearance="@style/TextAppearance.AppCompat.Large"
+            android:maxLines="1"
+            android:layout_toStartOf="@id/tvDeviceSensorStatus"
+            android:layout_alignParentStart="true"
+            android:ellipsize="end">
+        </TextView>
+
+        <TextView
+            android:id="@+id/tvDeviceID"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_below="@id/tvDeviceSensorType"
+            android:text="@string/deviceID_placeholder">
+        </TextView>
+
+        <TextView
+            android:id="@+id/tvDeviceTimeStamp"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_below="@id/tvDeviceID"
+            android:text="@string/sensor_time_stamp_placeholder">
+        </TextView>
+
+        <TextView
+            android:id="@+id/tvDeviceSensorMassage"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_below="@id/tvDeviceTimeStamp"
+            android:text="@string/sensor_message_placeholder">
+        </TextView>
+
+    </RelativeLayout>
+
+</androidx.cardview.widget.CardView>

app/src/main/res/values/strings.xml

@@ -1,3 +1,8 @@
 <resources>
     <string name="app_name">GreenWatch</string>
+    <string name="sensor_type_placeholder">Sensortyp: %s</string>
+    <string name="sensor_status_placeholder">Sensorstatus: %s</string>
+    <string name="deviceID_placeholder">Sensor-ID: %s</string>
+    <string name="sensor_time_stamp_placeholder">Timestamp: %s</string>
+    <string name="sensor_message_placeholder">Sensormessage: %d</string>
 </resources>