Runnable test implementation

app/src/main/AndroidManifest.xml

@@ -3,6 +3,11 @@
     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.READ_MEDIA_AUDIO" />
+    <uses-permission android:name="android.permission.READ_MEDIA_VIDEO" />
+    <uses-permission android:name="android.permission.RECORD_AUDIO" />
+    <uses-permission android:name="android.permission.CAMERA" />
 
     <application
         android:allowBackup="true"
@@ -11,6 +16,21 @@
         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 +1,147 @@
+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);
+                Toast.makeText(AccelerometerActivity.this, "onChanged", Toast.LENGTH_LONG).show();
+            }
+        });
+
+        mAccelerometerViewModel.getAlarmHistoryList().observe(this, new Observer<List<Device>>() {
+            @Override
+            public void onChanged(List<Device> devices) {
+                alarmHistoryListAdapter.setAlarmHistoryList(devices);
+            }
+        });
+
+        mAccelerometerViewModel.getMovementDetectedValue().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/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/MainActivity.java

@@ -1,56 +1,147 @@
 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.annotation.SuppressLint;
+import android.content.Intent;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.Button;
-import android.widget.EditText;
+import android.widget.Toast;
-import android.widget.TextView;
+
-import java.net.SocketException;
+import com.example.greenwatch.adapters.AlarmHistoryListAdapter;
+import com.example.greenwatch.adapters.DeviceListAdapter;
+import com.example.greenwatch.models.Device;
+import com.example.greenwatch.viewmodels.MainActivityViewModel;
+
+import java.util.List;
 
 public class MainActivity extends AppCompatActivity {
-    WifiCommunication communication; //Member WifiCommunication
-    TextView tvReceivedData; //Test Textview um empfangene Daten anzuzeigen -> Gegen finale Textview in der Anzeige austauschen
-    //ToDo: Falls finale Textview zum Anzeigen der Nachricht anders heißt, muss das in der Klasse WifiCommunication.java angepasst werden!
-    // Wo anpassen: Receive Thread, Zeile 58
-    private EditText etSendMessage; //Test Edittext um eine Nachricht zu senden -> gegen Nachricht von den Sensoren austauschen
-    private Button btnSend; //Test Sendebutton
 
-    private String sendmsg = "default";
+    private Button audiodetectionButton;
+    private Button videodetectionButton;
+    private Button accelerometerButton;
+    private Button audiodetectionAndAccelerometerButton;
+    private Button videodetectionAndAccelerometerButton;
+    private Button connectionButton;
+    private MainActivityViewModel mMainActivityViewModel;
 
-    @SuppressLint("MissingInflatedId")
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
-        xmlToJava(); //Funktionsaufruf, wo die Testbuttons etc angelegt sind
+        audiodetectionButton = (Button) findViewById(R.id.audiodetectionButton);
+        videodetectionButton = (Button) findViewById(R.id.videodetectionButton);
+        accelerometerButton = (Button) findViewById(R.id.accelerometerButton);
+        audiodetectionAndAccelerometerButton = (Button) findViewById(R.id.audiodetectionAndAccelerometerButton);
+        videodetectionAndAccelerometerButton = (Button) findViewById(R.id.videodetectionAndAccelerometerButton);
+        connectionButton = (Button) findViewById(R.id.connectionButton);
+
+        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.getConnectedDeviceList().observe(this, new Observer<List<Device>>() {
+            @Override
+            public void onChanged(List<Device> devices) {
+                deviceListAdapter.setDevices(devices);
+                Toast.makeText(MainActivity.this, "onChanged", Toast.LENGTH_LONG).show();
+            }
+        });
+
+        mMainActivityViewModel.getAlarmHistoryList().observe(this, new Observer<List<Device>>() {
+            @Override
+            public void onChanged(List<Device> devices) {
+                alarmHistoryListAdapter.setAlarmHistoryList(devices);
+            }
+        });
+
+        audiodetectionButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                //openAudiodetectionActivity();
+                mMainActivityViewModel.updateDevice(mMainActivityViewModel.getLocalDeviceUUID(), "10:51",  false, "Audio", 10);
+            }
+        });
+        videodetectionButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                //openVideodetectionActivity();
+                mMainActivityViewModel.setSensorType(mMainActivityViewModel.getLocalDeviceUUID(), "Video");
+                mMainActivityViewModel.setTimeStamp(mMainActivityViewModel.getLocalDeviceUUID(), "12:50");
+                mMainActivityViewModel.setDeviceID(mMainActivityViewModel.getLocalDeviceUUID(), "12345");
+            }
+        });
+        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) {
+                openConnectionActivity();
+            }
+        });
+    }
+    public void openAudiodetectionActivity(){
+        Intent intent = new Intent(this, AudiodetectionActivity.class);
+        startActivity(intent);
+    }
+    public void openVideodetectionActivity(){
+        Intent intent =  new Intent(this, VideodetectionActivity.class);
+        startActivity(intent);
+    }
+    public void openAccelerometerActivity(){
+        Intent intent = new Intent(this, AccelerometerActivity.class);
+        startActivity(intent);
+    }
+    public void openAudiodetectionAndAccelerometerActivity(){
+        Intent intent = new Intent(this, AudiodetectionAndAccelerometerActivity.class);
+        startActivity(intent);
+    }
+    public void openVideodetectionAndAccelerometerActivity(){
+        //Intent intent = new Intent(this, VideodetectionAndAccelerometerActivity.class);
+        //startActivity(intent);
+        mMainActivityViewModel.updateDevice(mMainActivityViewModel.getLocalDeviceUUID(), "24:00",  false, "Video", 0);
+    }
+    public void openConnectionActivity(){
+        //Intent intent = new Intent(this, ConnectionActivity.class);
+        //startActivity(intent);
+        mMainActivityViewModel.updateDevice(mMainActivityViewModel.getLocalDeviceUUID(), "10:51",  true, "Audio", 10);
     }
 
-    public void xmlToJava(){
-        tvReceivedData = findViewById(R.id.tvRecTxt);       //Test Textview
-        etSendMessage = findViewById(R.id.sendMessage);     //Test Nachricht
-        btnSend = findViewById(R.id.btnSend);               //Test Sendebefehl
-    }
-
-    public void onClickSend(View view) throws SocketException{  //ToDo: Sendebefehl mit boolscher Variable lösen --> wo setzen?
-        sendmsg = etSendMessage.getText().toString();           //ToDo: hier String von Sensoren übergeben
-        communication.setMessage(sendmsg, true);    //übergibt zu sendenden String und setzt die entscheidende Boolsche Variable fürs Senden
-    }
-
-    @Override
-    protected void onResume() {
-        super.onResume();
-        //Erstellen des Members
-        communication = new WifiCommunication(MainActivity.this, MainActivity.this, 1234);
-    }
-
-    @Override
-    protected void onPause() {
-        super.onPause();
-        //schließt socket
-        communication.stopCommunication();
-    }
 }

app/src/main/java/com/example/greenwatch/VideodetectionActivity.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 VideodetectionActivity extends AppCompatActivity {
+
+    private Button backToMainActivity;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_videodetection);
+
+        backToMainActivity = (Button) findViewById(R.id.videodetectorBackToMainActivity);
+
+        backToMainActivity.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                finish();
+            }
+        });
+    }
+}

app/src/main/java/com/example/greenwatch/VideodetectionAndAccelerometerActivity.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 VideodetectionAndAccelerometerActivity extends AppCompatActivity {
+
+    private Button backToMainActivity;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_videodetection_and_accelerometer);
+
+        backToMainActivity = (Button) findViewById(R.id.videodetectionAndAccelerometerBackToMainActivity);
+
+        backToMainActivity.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                finish();
+            }
+        });
+    }
+}

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/alarmrecorder/AlarmRecorder.java

@@ -0,0 +1,246 @@
+package com.example.greenwatch.alarmrecorder;
+
+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.widget.Toast;
+
+import com.example.greenwatch.MainActivity;
+import com.example.greenwatch.alarmrecorder.runnables.AudioRecorder;
+import com.example.greenwatch.alarmrecorder.runnables.VideoRecorder;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+public class AlarmRecorder {
+
+    private boolean isRecording;
+    private String videoPath;
+    private String audioPath;
+    private MediaFormat videoFormat;
+    private MediaFormat audioFormat;
+    private MediaExtractor videoExtractor;
+    private MediaExtractor audioExtractor;
+    private Runnable audioRecorderRunnable;
+    private Runnable videoRecorderRunnable;
+    private MediaRecorder videoRecorder;
+    private MediaRecorder audioRecorder;
+    private Thread videoThread; // Video-Thread als Instanzvariable
+    private Thread audioThread; // Audio-Thread als Instanzvariable
+
+    public AlarmRecorder() {
+        audioRecorder = new MediaRecorder();
+        videoRecorder = new MediaRecorder();
+        videoExtractor = new MediaExtractor();
+        audioExtractor = new MediaExtractor();
+    }
+
+
+    private void startRecording() {
+        createStoragePaths(); //Speicherort und -namen für Audio- und Video-Datei
+
+        audioRecorderRunnable = new AudioRecorder(audioRecorder, audioPath);
+        videoRecorderRunnable = new VideoRecorder(videoRecorder, videoPath);
+        audioThread = new Thread(audioRecorderRunnable);
+        videoThread = new Thread(videoRecorderRunnable);
+
+        //Threads starten
+        videoThread.start();
+        audioThread.start();
+    }
+
+    private void stopRecording() {
+        isRecording = false;
+        try {
+            stopVideoRecording();
+            stopAudioRecording();
+
+            runOnUiThread(new Runnable() {
+                @Override
+                public void run() {
+                    Toast.makeText(MainActivity.this, "Video- und Audioaufzeichnung beendet", Toast.LENGTH_SHORT).show();
+                }
+            });
+
+            waitTillThreadsStopped();
+            File videoFile = new File(videoPath); //Speichere das aufgenommene Video
+            File audioFile = new File(audioPath); //Speichere die aufgenommene Audio
+
+            if (videoFile.exists() && audioFile.exists()) {
+                //Wenn Video- und Audioaufzeichnung gestoppt und abgespeichert sind, beginne mit dem Mergeprozess der beiden
+                mergeVideoWithAudio();
+            } else {
+                Toast.makeText(MainActivity.this, "Dateien wurden nicht gefunden!", Toast.LENGTH_SHORT).show();
+            }
+        } catch (RuntimeException stopException) {
+            stopException.printStackTrace();
+        }
+    }
+
+    private void createStoragePaths(){
+        //Pfade zum Zwischenspeichern der aufgenommenen Audio und Video-Datei
+        isRecording = true;
+        String externalStorageDirectory = Environment.getExternalStorageDirectory().getAbsolutePath();
+        String dcimDirectory = externalStorageDirectory + "/DCIM";
+        videoPath = dcimDirectory + "/video.mp4";
+        audioPath = dcimDirectory + "/audio.mp3";
+    }
+
+    private void stopVideoRecording(){
+        if (videoRecorder != null) {
+            videoRecorder.stop();
+            videoRecorder.release();
+            videoRecorder = null;
+        }
+    }
+
+    private void stopAudioRecording(){
+        if (audioRecorder != null) {
+            audioRecorder.stop();
+            audioRecorder.release();
+            audioRecorder = null;
+        }
+    }
+
+    private void waitTillThreadsStopped(){
+        try {
+            videoThread.join();
+            audioThread.join();
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private void mergeVideoWithAudio() {
+        try {
+            setVideoExtractorDataSource(); //extrahieren der Video Datei, die zuvor zwischengespeichert wurde
+            setAudioExtractorDataSource(); //extrahieren der Audio Datei, die zuvor zwischengespeichert wurde
+
+            //Speicherort der später zusammengeführten Datei
+            String outputFilePath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES).getAbsolutePath() + "/merged_video.mp4";
+            //MediaMuxer zum Zusammenführen einer Audio- und einer Videodatei
+            MediaMuxer muxer = new MediaMuxer(outputFilePath, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
+            int videoTrack = muxer.addTrack(videoFormat);
+            int audioTrack = muxer.addTrack(audioFormat);
+            muxer.start();
+
+            ByteBuffer buffer = ByteBuffer.allocate(1024 * 1024);
+            MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
+
+            videoExtraction(buffer, videoTrack, bufferInfo, muxer);
+            audioExtraction(buffer, audioTrack, bufferInfo, muxer);
+
+            muxer.stop();
+            muxer.release();
+
+            runOnUiThread(new Runnable() {
+                @Override
+                public void run() {
+                    Toast.makeText(MainActivity.this, "Video und Audio erfolgreich zusammengeführt", Toast.LENGTH_SHORT).show();
+                }
+            });
+
+            // Löschen der separaten Video- und Audio-Dateien
+            deleteVideoFile();
+            deleteAudioFile();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private void setVideoExtractorDataSource() {
+        try {
+            videoExtractor.setDataSource(videoPath);
+            int videoTrackIndex = getTrackIndex(videoExtractor, "video/");
+            if (videoTrackIndex < 0) {
+                // Video-Track nicht gefunden
+                return;
+            }
+            videoExtractor.selectTrack(videoTrackIndex);
+            videoFormat = videoExtractor.getTrackFormat(videoTrackIndex);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private void setAudioExtractorDataSource() {
+        try {
+            audioExtractor.setDataSource(audioPath);
+            int audioTrackIndex = getTrackIndex(audioExtractor, "audio/");
+            if (audioTrackIndex < 0) {
+                // Audio-Track nicht gefunden
+                return;
+            }
+            audioExtractor.selectTrack(audioTrackIndex);
+            audioFormat = audioExtractor.getTrackFormat(audioTrackIndex);
+
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private int getTrackIndex(MediaExtractor extractor, String mimeType) {
+        int trackCount = extractor.getTrackCount();
+        for (int i = 0; i < trackCount; i++) {
+            MediaFormat format = extractor.getTrackFormat(i);
+            String trackMimeType = format.getString(MediaFormat.KEY_MIME);
+            if (trackMimeType.startsWith(mimeType)) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
+    private void videoExtraction(ByteBuffer buffer, int videoTrack, MediaCodec.BufferInfo bufferInfo, MediaMuxer muxer) {
+        videoExtractor.seekTo(0, MediaExtractor.SEEK_TO_CLOSEST_SYNC);
+        while (true) {
+            int sampleSize = videoExtractor.readSampleData(buffer, 0);
+            if (sampleSize < 0) {
+                break;
+            }
+            long presentationTimeUs = videoExtractor.getSampleTime();
+            bufferInfo.offset = 0;
+            bufferInfo.size = sampleSize;
+            bufferInfo.flags = MediaCodec.BUFFER_FLAG_KEY_FRAME;
+            bufferInfo.presentationTimeUs = presentationTimeUs;
+            muxer.writeSampleData(videoTrack, buffer, bufferInfo);
+            videoExtractor.advance();
+        }
+    }
+
+    private void audioExtraction(ByteBuffer buffer, int audioTrack, MediaCodec.BufferInfo bufferInfo, MediaMuxer muxer) {
+        audioExtractor.seekTo(0, MediaExtractor.SEEK_TO_CLOSEST_SYNC);
+        while (true) {
+            int sampleSize = audioExtractor.readSampleData(buffer, 0);
+            if (sampleSize < 0) {
+                break;
+            }
+            long presentationTimeUs = audioExtractor.getSampleTime();
+            bufferInfo.offset = 0;
+            bufferInfo.size = sampleSize;
+            bufferInfo.flags = 0; // or MediaCodec.BUFFER_FLAG_KEY_FRAME
+            bufferInfo.presentationTimeUs = presentationTimeUs;
+            muxer.writeSampleData(audioTrack, buffer, bufferInfo);
+            audioExtractor.advance();
+        }
+    }
+
+
+    private void deleteVideoFile(){
+        File videoFile = new File(videoPath);
+        if (videoFile.exists()) {
+            videoFile.delete();
+        }
+    }
+
+    private void deleteAudioFile(){
+        File audioFile = new File(audioPath);
+        if (audioFile.exists()) {
+            audioFile.delete();
+        }
+    }
+}

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

@@ -0,0 +1,33 @@
+package com.example.greenwatch.alarmrecorder.runnables;
+
+import android.media.MediaRecorder;
+import android.widget.Toast;
+
+import com.example.greenwatch.MainActivity;
+
+import java.io.IOException;
+
+public class AudioRecorder implements Runnable {
+
+    private final MediaRecorder audioRecorder;
+    private final String audioPath;
+    public AudioRecorder(MediaRecorder audioRecorder, String audioPath) {
+        this.audioRecorder = audioRecorder;
+        this.audioPath = audioPath;
+    }
+    @Override
+    public void run() {
+        audioRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
+        audioRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
+        audioRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
+        audioRecorder.setOutputFile(audioPath);
+
+        try {
+            audioRecorder.prepare();
+            audioRecorder.start();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+}

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

@@ -0,0 +1,35 @@
+package com.example.greenwatch.alarmrecorder.runnables;
+
+import android.media.MediaRecorder;
+
+import com.example.greenwatch.viewmodels.ViewModelInterface;
+
+import java.io.IOException;
+
+public class VideoRecorder implements Runnable{
+    private final MediaRecorder videoRecorder;
+    private final String videoPath;
+
+    public VideoRecorder(MediaRecorder videoRecorder, String videoPath) {
+        this.videoRecorder = videoRecorder;
+        this.videoPath = videoPath;
+    }
+    @Override
+    public void run() {
+        videoRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
+        videoRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
+        videoRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);
+        videoRecorder.setOutputFile(videoPath);
+        videoRecorder.setOrientationHint(90);
+        //todo find solution for videoView
+        videoRecorder.setPreviewDisplay(videoView.getHolder().getSurface());
+
+        try {
+            videoRecorder.prepare();
+            videoRecorder.start();
+
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

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

@@ -1,8 +1,6 @@
-package com.example.greenwatch;
+package com.example.greenwatch.communication;
 
-import android.annotation.SuppressLint;
+import com.example.greenwatch.repositories.DeviceRepository;
-import android.content.Context;
-import android.widget.Toast;
 
 import java.io.IOException;
 import java.net.DatagramPacket;
@@ -14,93 +12,50 @@ import java.net.SocketException;
 import java.net.UnknownHostException;
 import java.util.Enumeration;
 
-public class WifiCommunication {
+public class WiFiCommunication {
-    private final MainActivity mainActivity;
+
     private final InetAddress address;
-    private final int port;
-    private final Context context;
-    private boolean newMsg;
-    private String rxString;
-    private String sendMsg;
-    //private String sendMsg = "default";
     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;
-    @SuppressLint("SetTextI18n")
+    private static WiFiCommunication wifiCommunicationInstance;
-    public WifiCommunication(MainActivity mainActivity, Context context, int port) {
+    private DeviceRepository mDeviceRepository;
-        this.mainActivity = mainActivity;
+
-        this.port = port;
+    private WiFiCommunication() {
-        this.context = context;
+        port = 1234;
         try {
-            socket = new DatagramSocket(this.port);
+            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);
         }
-        mainActivity.runOnUiThread(() -> Toast.makeText(context,"Communication running", Toast.LENGTH_SHORT).show());
     }
-    private class ReceiveThread extends Thread {
-        private String rxString = "";
-        private String previousRxString = "";
-        @Override
-        public void run() {
-            try {
-                do {
 
-                    byte[] rxBuffer = new byte[1024];
+    public static synchronized WiFiCommunication getInstance() {
-                    DatagramPacket packet = new DatagramPacket(rxBuffer, rxBuffer.length);
+        if (wifiCommunicationInstance == null){
-                    socket.receive(packet);
+            wifiCommunicationInstance = new WiFiCommunication();
-                    rxString = new String(packet.getData(), 0, packet.getLength());
-
-                    if(!previousRxString.equals(rxString))
-                        mainActivity.runOnUiThread(() -> mainActivity.tvReceivedData.setText(rxString));
-
-                    previousRxString = rxString;
-
-                } while (running);
-            }
-            catch (IOException e) {
-                e.printStackTrace();
-            }
         }
+        return wifiCommunicationInstance;
     }
 
-    public String showMessage(){
+    public void setDeviceRepository(DeviceRepository deviceRepository) {
-        return rxString;
+        this.mDeviceRepository = deviceRepository;
     }
-    public void setMessage(String message, boolean newMsg){
+
-        this.sendMsg=message;
+    public void setNewMessage(String newMessage, boolean isNewMessage){
-        this.newMsg = newMsg;
+        this.sendMessage = newMessage;
+        this.isNewMessage = isNewMessage;
     }
-    private class SendThread extends Thread {
-        private int tmpCnt = 0;
-        @Override
-        public void run() {
-            try {
-                do {
 
-                    if(newMsg == true)
-                    {
-                        newMsg = false;
-
-                        String txString = getLocalIpAddress() + " sends. #" + tmpCnt++ + sendMsg;
-                        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();
-            }
-        }
-    }
     public static String getLocalIpAddress() {
         try {
             for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
@@ -117,8 +72,62 @@ public class WifiCommunication {
         }
         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 +1,286 @@
+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 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();
+    }
+
+    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 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);
+        }
+        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);
+            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);
+            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 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();
+    }
+}

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

@@ -0,0 +1,162 @@
+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 java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+
+public class AccelerometerViewModel extends ViewModel implements ViewModelInterface {
+
+    private MutableLiveData<List<Device>> mDeviceList;
+    private MutableLiveData<Boolean> mMovementDetected = new MutableLiveData<>();
+    private MutableLiveData<List<Device>> mAlarmHistoryList;
+    private DeviceRepository mDeviceRepository;
+    private ArrayList<Float> Gesamt_be;
+    int arraySize = 500;
+    int functionCallCount;
+    float meanValue;
+    float offsetValue;
+    float thresholdValue;
+    boolean startMeasuring;
+
+    @Override
+    public void init() {
+        if (mDeviceList == null) {
+            mDeviceRepository = DeviceRepository.getInstance();
+            mDeviceList = mDeviceRepository.getConnectedDeviceList();
+            mAlarmHistoryList = mDeviceRepository.getAlarmHistoryDeviceList();
+        }
+        initGesamtBE();
+        mMovementDetected.setValue(false);
+        functionCallCount = 0;
+        meanValue = 0f;
+        offsetValue = 0.1f;
+        thresholdValue = 0.15f;
+        startMeasuring = false;
+    }
+
+    public void initGesamtBE() {
+        Gesamt_be = new ArrayList<>(arraySize);
+        for (int i = 0; i < arraySize; i++) {
+            Gesamt_be.add(0f);
+        }
+    }
+
+    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 && !mMovementDetected.getValue()) {
+            mMovementDetected.setValue(true);
+        }
+        else if (meanValue < (thresholdValue + offsetValue) && mMovementDetected.getValue()){
+            mMovementDetected.setValue(false);
+        }
+    }
+
+    public String getSystemTimeStamp() {
+        return mDeviceRepository.getSystemTimeStamp();
+    }
+
+    public LiveData<Boolean> getMovementDetectedValue() {
+        return mMovementDetected;
+    }
+
+    @Override
+    public LiveData<List<Device>> getConnectedDeviceList() {
+        return mDeviceList;
+    }
+
+    @Override
+    public LiveData<List<Device>> getAlarmHistoryList() {
+        return mAlarmHistoryList;
+    }
+
+    @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();
+    }
+}

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

@@ -0,0 +1,105 @@
+package com.example.greenwatch.viewmodels;
+
+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 DeviceRepository mDeviceRepository;
+
+    @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);
+        mDeviceRepository.createNewDevice("00:00", "1234", true, "Test", 21);
+        mDeviceList = mDeviceRepository.getConnectedDeviceList();
+        mAlarmHistoryList = mDeviceRepository.getAlarmHistoryDeviceList();
+    }
+
+    @Override
+    public LiveData<List<Device>> getConnectedDeviceList() {
+        return mDeviceList;
+    }
+
+    @Override
+    public LiveData<List<Device>> getAlarmHistoryList() {
+        return mAlarmHistoryList;
+    }
+
+    @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();
+    }
+}

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

@@ -0,0 +1,25 @@
+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();
+    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();
+}

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

@@ -1,36 +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">
 
-    <TextView
+    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/tvRecTxt"
+        android:id="@+id/alarmHistoryListRecyclerView"
-        android:layout_width="wrap_content"
+        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
+        android:layout_height="match_parent"
-        android:text="Received Message"
+        android:layout_weight="3"
-        app:layout_constraintTop_toBottomOf="@id/sendMessage"
+        tools:listitem="@layout/alarm_history_item">
-        app:layout_constraintStart_toStartOf="parent"/>
+    </androidx.recyclerview.widget.RecyclerView>
 
-    <EditText
+    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/sendMessage"
+        android:id="@+id/deviceListRecyclerView"
-        android:layout_width="wrap_content"
+        android:layout_width="match_parent"
-        android:layout_height="50dp"
+        android:layout_height="match_parent"
-        android:ems="10"
+        android:layout_weight="3"
-        android:inputType="textPersonName"
+        tools:listitem="@layout/device_item">
-        android:text="Send Message"
+    </androidx.recyclerview.widget.RecyclerView>
-        app:layout_constraintTop_toTopOf="parent"
+    
-        app:layout_constraintStart_toStartOf="parent"/>
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical"
+        android:layout_weight="3">
 
-    <Button
+        <Button
-        android:id="@+id/btnSend"
+            android:id="@+id/audiodetectionButton"
-        android:layout_width="wrap_content"
+            android:layout_width="match_parent"
-        android:layout_height="wrap_content"
+            android:layout_height="wrap_content"
-        android:text="Send"
+            android:layout_weight="1"
-        android:onClick="onClickSend"
+            android:text="Audiodetection">
-        app:layout_constraintTop_toTopOf="parent"
+        </Button>
-        app:layout_constraintStart_toEndOf="@id/sendMessage"/>
 
-</androidx.constraintlayout.widget.ConstraintLayout>
+        <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 +1,25 @@
+<?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=".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>

app/src/main/res/layout/activity_videodetection_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=".VideodetectionAndAccelerometerActivity">
+
+    <TextView
+        android:id="@+id/tvVideodetectionAndAccelerometerStatusmessage"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Videodetection + Accelerometer Activity">
+    </TextView>
+
+    <Button
+        android:id="@+id/videodetectionAndAccelerometerBackToMainActivity"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Back to MainActivity">
+    </Button>
+
+</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>