diff --git a/app/src/main/java/com/example/greenwatch/MainActivity.java b/app/src/main/java/com/example/greenwatch/MainActivity.java
index 66cca92..1778dc4 100644
--- a/app/src/main/java/com/example/greenwatch/MainActivity.java
+++ b/app/src/main/java/com/example/greenwatch/MainActivity.java
@@ -1,54 +1,101 @@
 package com.example.greenwatch;
 
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.lifecycle.Observer;
+import androidx.lifecycle.ViewModelProvider;
 
 import android.content.Intent;
 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.MainActivityViewModel;
+
+import java.util.List;
 
 public class MainActivity extends AppCompatActivity {
 
+    private TextView tvstatusmessage;
     private Button audiodetectionButton;
     private Button videodetectionButton;
     private Button accelerometerButton;
     private Button audiodetectionAndAccelerometerButton;
     private Button videodetectionAndAccelerometerButton;
     private Button connectionButton;
+    private MainActivityViewModel mMainActivityViewModel;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
+        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();
+                //openAudiodetectionActivity();
+                mMainActivityViewModel.setDevice(mMainActivityViewModel.getLocalDeviceUUID(), "10:51", "12345", false, "Audio", 10);
             }
         });
         videodetectionButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                openVideodetectionActivity();
+                //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();
+                //openAccelerometerActivity();
+                mMainActivityViewModel.setSensorType(mMainActivityViewModel.getLocalDeviceUUID(), "Accelerometer");
+                mMainActivityViewModel.setTimeStamp(mMainActivityViewModel.getLocalDeviceUUID(), "24:00");
             }
         });
         audiodetectionAndAccelerometerButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                openAudiodetectionAndAccelerometerActivity();
+                //openAudiodetectionAndAccelerometerActivity();
+                mMainActivityViewModel.setSensorType(mMainActivityViewModel.getLocalDeviceUUID(), "AudiodetectionAndAccelerometer");
+                mMainActivityViewModel.setTimeStamp(mMainActivityViewModel.getLocalDeviceUUID(), "00:00");
+                mMainActivityViewModel.setDeviceID(mMainActivityViewModel.getLocalDeviceUUID(), "6789");
             }
         });
         videodetectionAndAccelerometerButton.setOnClickListener(new View.OnClickListener() {