Move the acceleration sensor to its own class

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

             }
         });
 
-        mAccelerometerViewModel.getMovementDetectedValue().observe(this, new Observer<Boolean>() {
+        mAccelerometerViewModel.getAccelerometerAlarmDetected().observe(this, new Observer<Boolean>() {
             @Override
             public void onChanged(Boolean aBoolean) {
                 if (aBoolean) {

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

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

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

     }
 
     public MutableLiveData<Boolean> getVideoAlarmDetectedValue() {
-        setMutableLiveDataVideoMovementDetected();
+        setMutableLiveDataVideoAlarmDetected();
         return mVideoAlarmDetected;
     }
 
-    private void setMutableLiveDataVideoMovementDetected() {
+    private void setMutableLiveDataVideoAlarmDetected() {
         mVideoAlarmDetected.setValue(videoAlarmDetected);
     }
 
 
     public void checkAlarmCondition() {
         if (videoAlarmDetected && !mVideoAlarmDetected.getValue()) {
-            setMutableLiveDataVideoMovementDetected();
+            setMutableLiveDataVideoAlarmDetected();
         }
         else if (!videoAlarmDetected && mVideoAlarmDetected.getValue()){
-            setMutableLiveDataVideoMovementDetected();
+            setMutableLiveDataVideoAlarmDetected();
         }
     }
 }

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

 
 import com.example.greenwatch.models.Device;
 import com.example.greenwatch.repositories.DeviceRepository;
+import com.example.greenwatch.sensors.AccelerometerSensor;
 
-import java.text.SimpleDateFormat;
-import java.util.ArrayList;
-import java.util.Date;
 import java.util.List;
 
 public class AccelerometerViewModel extends ViewModel implements ViewModelInterface {
 
     private MutableLiveData<List<Device>> mDeviceList;
-    private MutableLiveData<Boolean> mMovementDetected = new MutableLiveData<>();
+    private MutableLiveData<Boolean> mAccelerometerAlarmDetected;
     private MutableLiveData<List<Device>> mAlarmHistoryList;
     private MutableLiveData<Boolean> mStartAlarmRecording;
+    private AccelerometerSensor mAccelerometerSensor;
     private 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) {
+        if (mDeviceRepository == null) {
             mDeviceRepository = DeviceRepository.getInstance();
+        }
+        if (mAccelerometerSensor == null) {
+            mAccelerometerSensor = AccelerometerSensor.getInstance();
+        }
+        if (mDeviceList == null) {
             mDeviceList = mDeviceRepository.getConnectedDeviceList();
+        }
+        if (mAlarmHistoryList == null) {
             mAlarmHistoryList = mDeviceRepository.getAlarmHistoryDeviceList();
+        }
+        if (mStartAlarmRecording == null) {
             mStartAlarmRecording = mDeviceRepository.getStartAlarmRecording();
         }
-        initGesamtBE();
-        mMovementDetected.setValue(false);
-        functionCallCount = 0;
-        meanValue = 0f;
-        offsetValue = 0.1f;
-        thresholdValue = 0.15f;
-        startMeasuring = false;
-    }
-
-    public void initGesamtBE() {
-        Gesamt_be = new ArrayList<>(arraySize);
-        for (int i = 0; i < arraySize; i++) {
-            Gesamt_be.add(0f);
+        if (mAccelerometerAlarmDetected == null) {
+            mAccelerometerAlarmDetected = mAccelerometerSensor.getAccelerometerAlarmDetected();
         }
     }
 
     public void addValueToGesamtBE(float newValue) {
-        if (Gesamt_be.size() == arraySize) {
-            Gesamt_be.remove(Gesamt_be.size() -1);
-        }
-        Gesamt_be.add(0, newValue);
-        functionCallCount++;
+        mAccelerometerSensor.addValueToGesamtBE(newValue);
     }
 
     public void meanValueCalculation() {
-        for (float element : Gesamt_be) {
-            meanValue += Math.abs(element);
-        }
-        meanValue = meanValue/arraySize;
+        mAccelerometerSensor.meanValueCalculation();
     }
 
     public void calibrateAccelerometerSensor() {
-        if (functionCallCount <= arraySize) {
-            offsetValue = meanValue;
-        }
-        else {
-            startMeasuring = true;
-        }
+        mAccelerometerSensor.calibrateAccelerometerSensor();
     }
 
     public void checkAlarmCondition() {
-        if (meanValue > (thresholdValue + offsetValue) && startMeasuring && !mMovementDetected.getValue()) {
-            mMovementDetected.setValue(true);
-        }
-        else if (meanValue < (thresholdValue + offsetValue) && mMovementDetected.getValue()){
-            mMovementDetected.setValue(false);
-        }
+        mAccelerometerSensor.checkAlarmCondition();
     }
 
-    public LiveData<Boolean> getMovementDetectedValue() {
-        return mMovementDetected;
+    public LiveData<Boolean> getAccelerometerAlarmDetected() {
+        return mAccelerometerAlarmDetected;
     }
 
     @Override