Added Accelerometer to Project

app/src/main/AndroidManifest.xml

@@ -2,8 +2,6 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.example.greenwatch">
 
-    <uses-permission android:name="android.permission.INTERNET" />
-
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
@@ -11,6 +9,24 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.GreenWatch">
+        <activity
+            android:name=".ConnectionActivity"
+            android:exported="false" />
+        <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 +1,137 @@
+package com.example.greenwatch;
+
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.lifecycle.Observer;
+import androidx.lifecycle.ViewModelProvider;
+
+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.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);
+
+        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) {
+                StringBuilder sb = new StringBuilder();
+                sb.append("Time Stamp: ");
+                sb.append(mAccelerometerViewModel.getTimeStamp(mAccelerometerViewModel.getLocalDeviceUUID()));
+                sb.append(";\n");
+                sb.append("DeviceID: ");
+                sb.append(mAccelerometerViewModel.getDeviceID(mAccelerometerViewModel.getLocalDeviceUUID()));
+                sb.append(";\n");
+                sb.append("Sensor Status: ");
+                sb.append(mAccelerometerViewModel.getSensorStatus(mAccelerometerViewModel.getLocalDeviceUUID()));
+                sb.append(";\n");
+                sb.append("Sensor Type: ");
+                sb.append(mAccelerometerViewModel.getSensorType(mAccelerometerViewModel.getLocalDeviceUUID()));
+                sb.append(";\n");
+                sb.append("Sensor Massage: ");
+                sb.append(mAccelerometerViewModel.getSensorMassage(mAccelerometerViewModel.getLocalDeviceUUID()));
+                accelerometerStatusMessage.setText(sb);
+                Toast.makeText(AccelerometerActivity.this, "onChanged", Toast.LENGTH_LONG).show();
+            }
+        });
+
+        mAccelerometerViewModel.getMovementDetectedValue().observe(this, new Observer<Boolean>() {
+            @Override
+            public void onChanged(Boolean aBoolean) {
+                if (aBoolean) {
+                    mAccelerometerViewModel.setDevice(mAccelerometerViewModel.getLocalDeviceUUID(), mAccelerometerViewModel.getSystemTimeStamp(), mAccelerometerViewModel.getLocalDeviceUUID(), true, "Accelerometer", 10);
+                }
+                else {
+                    mAccelerometerViewModel.setDevice(mAccelerometerViewModel.getLocalDeviceUUID(), mAccelerometerViewModel.getSystemTimeStamp(), mAccelerometerViewModel.getLocalDeviceUUID(), 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/ConnectionActivity.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 ConnectionActivity extends AppCompatActivity {
+
+    private Button backToMainActivity;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_connection);
+
+        backToMainActivity = (Button) findViewById(R.id.connectionBackToMainActivity);
+
+        backToMainActivity.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                finish();
+            }
+        });
+    }
+}

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

@@ -1,56 +1,138 @@
 package com.example.greenwatch;
 
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.lifecycle.Observer;
+import androidx.lifecycle.ViewModelProvider;
 
-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.TextView;
-import java.net.SocketException;
+import android.widget.Toast;
+
+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 TextView tvstatusmessage;
+    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
+        tvstatusmessage = (TextView) findViewById(R.id.tvStatusmessage);
+        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);
+
+        mMainActivityViewModel = new ViewModelProvider(this).get(MainActivityViewModel.class);
+        mMainActivityViewModel.init();
+        mMainActivityViewModel.getConnectedDeviceList().observe(this, new Observer<List<Device>>() {
+            @Override
+            public void onChanged(List<Device> devices) {
+                StringBuilder sb = new StringBuilder();
+                sb.append("Time Stamp: ");
+                sb.append(mMainActivityViewModel.getTimeStamp(mMainActivityViewModel.getLocalDeviceUUID()));
+                sb.append(";\n");
+                sb.append("DeviceID: ");
+                sb.append(mMainActivityViewModel.getDeviceID(mMainActivityViewModel.getLocalDeviceUUID()));
+                sb.append(";\n");
+                sb.append("Sensor Status: ");
+                sb.append(mMainActivityViewModel.getSensorStatus(mMainActivityViewModel.getLocalDeviceUUID()));
+                sb.append(";\n");
+                sb.append("Sensor Type: ");
+                sb.append(mMainActivityViewModel.getSensorType(mMainActivityViewModel.getLocalDeviceUUID()));
+                sb.append(";\n");
+                sb.append("Sensor Massage: ");
+                sb.append(mMainActivityViewModel.getSensorMassage(mMainActivityViewModel.getLocalDeviceUUID()));
+                tvstatusmessage.setText(sb);
+                Toast.makeText(MainActivity.this, "onChanged", Toast.LENGTH_LONG).show();
+            }
+        });
+
+        audiodetectionButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                //openAudiodetectionActivity();
+                mMainActivityViewModel.setDevice(mMainActivityViewModel.getLocalDeviceUUID(), "10:51", "12345", 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(), mMainActivityViewModel.getLocalDeviceUUID());
+            }
+        });
+        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);
+    }
+    public void openConnectionActivity(){
+        Intent intent = new Intent(this, ConnectionActivity.class);
+        startActivity(intent);
     }
 
-    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/WifiCommunication.java

@@ -1,124 +0,0 @@
-package com.example.greenwatch;
-
-import android.annotation.SuppressLint;
-import android.content.Context;
-import android.widget.Toast;
-
-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 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;
-    volatile private boolean running;
-    @SuppressLint("SetTextI18n")
-    public WifiCommunication(MainActivity mainActivity, Context context, int port) {
-        this.mainActivity = mainActivity;
-        this.port = port;
-        this.context = context;
-        try {
-            socket = new DatagramSocket(this.port);
-            socket.setBroadcast(true);
-            address = InetAddress.getByName("255.255.255.255");
-            running = true;
-            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];
-                    DatagramPacket packet = new DatagramPacket(rxBuffer, rxBuffer.length);
-                    socket.receive(packet);
-                    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();
-            }
-        }
-    }
-
-    public String showMessage(){
-        return rxString;
-    }
-    public void setMessage(String message, boolean newMsg){
-        this.sendMsg=message;
-        this.newMsg = newMsg;
-    }
-    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();) {
-                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();
-    }
-}

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 +1,216 @@
+package com.example.greenwatch.repositories;
+
+
+import androidx.lifecycle.MutableLiveData;
+
+import com.example.greenwatch.models.Device;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.UUID;
+
+public class DeviceRepository {
+
+    private String delimiter = ", ";
+    private String deviceUUID;
+    private static DeviceRepository deviceRepositoryInstance;
+    private MutableLiveData<List<Device>> deviceList = new MutableLiveData<>();
+    private HashMap<String, Device> connectedDevicesList = new HashMap<>();
+    private HashMap<String, String> deviceIDMapper = new HashMap<>();
+
+    public static synchronized DeviceRepository getInstance() {
+        if (deviceRepositoryInstance == null){
+            deviceRepositoryInstance = new DeviceRepository();
+            deviceRepositoryInstance.setDeviceUUID();
+        }
+        return deviceRepositoryInstance;
+    }
+
+    public MutableLiveData<List<Device>> getConnectedDeviceList() {
+        setMutableLiveDataValue();
+        return deviceList;
+    }
+
+    public void createNewDevice(String timeStamp, String deviceID, boolean sensorStatus, String sensorType, int sensorMassage){
+        Device newDevice = new Device(timeStamp, deviceID, sensorStatus, sensorType, sensorMassage);
+        addToConnectedDeviceList(newDevice.getDeviceID(), newDevice);
+        setMutableLiveDataValue();
+    }
+
+    public void createNewRemoteDevice(String message) {
+        String[] messageString = messageStringSplitter(message);
+        String timeStamp = messageString[0];
+        String deviceID = messageString[1];
+        boolean sensorStatus = Boolean.valueOf(messageString[1]);
+        String sensorType = messageString[3];
+        int sensorMassage = Integer.valueOf(messageString[4]);
+
+        if(!connectedDevicesList.containsKey(deviceID)) {
+            createNewDevice(timeStamp, deviceID, sensorStatus, sensorType, sensorMassage);
+        }
+    }
+
+    public 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());
+            return message.toString();
+        }
+        return message.toString();
+    }
+
+    public String getLocalDeviceUUID() {
+        return deviceUUID;
+    }
+
+    public void setDevice(String deviceID, String timeStamp, String newDeviceID, boolean sensorStatus, String sensorType, int sensorMassage) {
+        String checkedDeviceID = checkDeviceID(deviceID);
+        Device device = connectedDevicesList.get(checkedDeviceID);
+        if(device != null) {
+            device.setTimeStamp(timeStamp);
+            device.setDeviceID(newDeviceID);
+            device.setSensorStatus(sensorStatus);
+            device.setSensorType(sensorType);
+            device.setSensorMassage(sensorMassage);
+            setDeviceIDMapper(newDeviceID);
+            connectedDevicesList.remove(checkedDeviceID);
+            addToConnectedDeviceList(newDeviceID, device);
+            setMutableLiveDataValue();
+        }
+    }
+
+    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);
+            setMutableLiveDataValue();
+        }
+    }
+
+    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);
+            setMutableLiveDataValue();
+        }
+    }
+
+    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) {
+            device.setSensorStatus(sensorStatus);
+            addToConnectedDeviceList(checkedDeviceID, device);
+            setMutableLiveDataValue();
+        }
+    }
+
+    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);
+            setMutableLiveDataValue();
+        }
+    }
+
+    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);
+            setMutableLiveDataValue();
+        }
+    }
+
+    public int getSensorMassage(String deviceID) {
+        String checkedDeviceID = checkDeviceID(deviceID);
+        Device device = connectedDevicesList.get(checkedDeviceID);
+        if(device != null) {
+            return device.getSensorMassage();
+        }
+        return 0;
+    }
+
+    private void setMutableLiveDataValue() {
+        List<Device> list = new ArrayList<>(connectedDevicesList.values());
+        deviceList.setValue(list);
+    }
+
+    private void addToConnectedDeviceList(String key, Device device) {
+        connectedDevicesList.put(key, device);
+    }
+
+    private String checkDeviceID(String deviceID) {
+        if(!deviceIDMapper.isEmpty() && deviceID.equals(deviceUUID)) {
+            return deviceIDMapper.get(deviceID);
+        }
+        return deviceID;
+    }
+
+    private void setDeviceIDMapper(String deviceID) {
+        deviceIDMapper.put(deviceUUID, deviceID);
+    }
+
+    private void setDeviceUUID(){
+        this.deviceUUID = UUID.randomUUID().toString();
+    }
+
+    private String[] messageStringSplitter(String message) {
+        return message.split(delimiter);
+    }
+}

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 java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+
+public class AccelerometerViewModel extends ViewModel {
+
+    private MutableLiveData<List<Device>> mDeviceList;
+    private MutableLiveData<Boolean> mMovementDetected = new MutableLiveData<>();
+    private DeviceRepository mDeviceRepository;
+    private ArrayList<Float> Gesamt_be;
+    int arraySize = 500;
+    int functionCallCount;
+    float meanValue;
+    float offsetValue;
+    float thresholdValue;
+    boolean startMeasuring;
+
+    public void init() {
+        if (mDeviceList == null) {
+            mDeviceRepository = DeviceRepository.getInstance();
+            mDeviceList = mDeviceRepository.getConnectedDeviceList();
+        }
+        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() {
+        SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss");
+        Date date = new Date(System.currentTimeMillis());
+        return formatter.format(date);
+    }
+
+    public LiveData<Boolean> getMovementDetectedValue() {
+        return mMovementDetected;
+    }
+
+    public LiveData<List<Device>> getConnectedDeviceList() {
+        return mDeviceList;
+    }
+
+    public void setDevice(String deviceID, String timeStamp, String newDeviceID, boolean sensorStatus, String sensorType, int sensorMassage) {
+        mDeviceRepository.setDevice(deviceID, timeStamp,newDeviceID, sensorStatus, sensorType, sensorMassage);
+    }
+
+    public void setTimeStamp(String deviceID, String timeStamp) {
+        mDeviceRepository.setTimeStamp(deviceID, timeStamp);
+    }
+
+    public String getTimeStamp(String deviceID) {
+        return mDeviceRepository.getTimeStamp(deviceID);
+    }
+
+    public void setDeviceID(String deviceID, String newDeviceID) {
+        mDeviceRepository.setDeviceID(deviceID, newDeviceID);
+    }
+
+    public String getDeviceID(String deviceID) {
+        return mDeviceRepository.getDeviceID(deviceID);
+    }
+
+    public void setSensorStatus(String deviceID, boolean sensorStatus) {
+        mDeviceRepository.setSensorStatus(deviceID, sensorStatus);
+    }
+
+    public boolean getSensorStatus(String deviceID) {
+        return mDeviceRepository.getSensorStatus(deviceID);
+    }
+
+    public void setSensorType(String deviceID, String sensorType) {
+        mDeviceRepository.setSensorType(deviceID, sensorType);
+    }
+
+    public String getSensorType(String deviceID) {
+        return mDeviceRepository.getSensorType(deviceID);
+    }
+
+    public void setSensorMassage(String deviceID, int sensorMessage) {
+        mDeviceRepository.setSensorMassage(deviceID, sensorMessage);
+    }
+
+    public int getSensorMassage(String deviceID) {
+        return mDeviceRepository.getSensorMassage(deviceID);
+    }
+
+    public String getLocalDeviceUUID() {
+        return mDeviceRepository.getLocalDeviceUUID();
+    }
+}

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

@@ -0,0 +1,77 @@
+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.util.List;
+
+public class MainActivityViewModel extends ViewModel {
+
+    private MutableLiveData<List<Device>> mDeviceList;
+    private DeviceRepository mDeviceRepository;
+
+    public void init() {
+        if(mDeviceList != null) {
+            return;
+        }
+        mDeviceRepository = DeviceRepository.getInstance();
+        mDeviceRepository.createNewDevice("", mDeviceRepository.getLocalDeviceUUID(), false, "", 0);
+        mDeviceList = mDeviceRepository.getConnectedDeviceList();
+    }
+
+    public LiveData<List<Device>> getConnectedDeviceList() {
+        return mDeviceList;
+    }
+
+    public void setDevice(String deviceID, String timeStamp, String newDeviceID, boolean sensorStatus, String sensorType, int sensorMassage) {
+        mDeviceRepository.setDevice(deviceID, timeStamp,newDeviceID, sensorStatus, sensorType, sensorMassage);
+    }
+
+    public void setTimeStamp(String deviceID, String timeStamp) {
+        mDeviceRepository.setTimeStamp(deviceID, timeStamp);
+    }
+
+    public String getTimeStamp(String deviceID) {
+        return mDeviceRepository.getTimeStamp(deviceID);
+    }
+
+    public void setDeviceID(String deviceID, String newDeviceID) {
+        mDeviceRepository.setDeviceID(deviceID, newDeviceID);
+    }
+
+    public String getDeviceID(String deviceID) {
+        return mDeviceRepository.getDeviceID(deviceID);
+    }
+
+    public void setSensorStatus(String deviceID, boolean sensorStatus) {
+        mDeviceRepository.setSensorStatus(deviceID, sensorStatus);
+    }
+
+    public boolean getSensorStatus(String deviceID) {
+        return mDeviceRepository.getSensorStatus(deviceID);
+    }
+
+    public void setSensorType(String deviceID, String sensorType) {
+        mDeviceRepository.setSensorType(deviceID, sensorType);
+    }
+
+    public String getSensorType(String deviceID) {
+        return mDeviceRepository.getSensorType(deviceID);
+    }
+
+    public void setSensorMassage(String deviceID, int sensorMessage) {
+        mDeviceRepository.setSensorMassage(deviceID, sensorMessage);
+    }
+
+    public int getSensorMassage(String deviceID) {
+        return mDeviceRepository.getSensorMassage(deviceID);
+    }
+
+    public String getLocalDeviceUUID() {
+        return mDeviceRepository.getLocalDeviceUUID();
+    }
+}

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

@@ -0,0 +1,39 @@
+<?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>

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_connection.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=".ConnectionActivity">
+
+    <TextView
+        android:id="@+id/tvConnectionStatusmessage"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Connection Activity">
+    </TextView>
+
+    <Button
+        android:id="@+id/connectionBackToMainActivity"
+        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 +1,75 @@
 <?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
-        android:id="@+id/tvRecTxt"
+        android:id="@+id/tvStatusmessage"
-        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:text="Hello World!"
-        app:layout_constraintTop_toBottomOf="@id/sendMessage"
+        android:layout_weight="1">
-        app:layout_constraintStart_toStartOf="parent"/>
+    </TextView>
     
-    <EditText
+    <LinearLayout
-        android:id="@+id/sendMessage"
+        android:layout_width="match_parent"
-        android:layout_width="wrap_content"
+        android:layout_height="match_parent"
-        android:layout_height="50dp"
+        android:orientation="vertical"
-        android:ems="10"
+        android:layout_weight="1">
-        android:inputType="textPersonName"
-        android:text="Send Message"
-        app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintStart_toStartOf="parent"/>
 
-    <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>