Refactor

app/src/main/java/com/example/ueberwachungssystem/Detection/DetectorService.java

 package com.example.ueberwachungssystem.Detection;
 
+import android.Manifest;
+import android.app.Activity;
 import android.content.Intent;
+import android.content.pm.PackageManager;
 import android.os.Binder;
 import android.os.IBinder;
 import android.util.Log;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.camera.core.ExperimentalGetImage;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
 import androidx.lifecycle.LifecycleService;
 
 @ExperimentalGetImage
 
     public TestBinder testBinder = new TestBinder();
     private DetectorService.OnDetectionListener listener;
+    private boolean isServiceRunning = false;
 
     VideoDetector videoDetector = null;
     AudioRecorder audioRecorder = null;
 
     @Override
     public int onStartCommand(Intent intent, int flags, int startId) {
+        if (isServiceRunning)
+            return START_NOT_STICKY;
         videoDetector = new VideoDetector(this);
         videoDetector.setOnDetectionListener(new Detector.OnDetectionListener() {
             @Override
         });
 
         audioRecorder = new AudioRecorder(this);
+
+
+        isServiceRunning = true;
+
         return super.onStartCommand(intent, flags, startId);
     }
 
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        isServiceRunning = false;
+    }
+
     /** Service methods */
     public class TestBinder extends Binder {
         public DetectorService getBoundService() {

app/src/main/java/com/example/ueberwachungssystem/Detection/VideoDetector.java

 
     // Recorder
     private File outputDir;      // Default: in app files directory
-    private int rotation = 0;
 
 
     // Parameters
     private static final float ALARM_THRESHOLD = 0.5f;   // Percent of pixels changed
     private static final float START_DELAY = 20000;   // milliseconds
-    private static final android.util.Size IMAGE_RES = new android.util.Size(640, 480);
+    private static final android.util.Size IMAGE_RES = new android.util.Size(480, 360);
 
 
 

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

 import androidx.appcompat.app.AppCompatActivity;
 import androidx.camera.core.ExperimentalGetImage;
 import androidx.camera.view.PreviewView;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
 
+import android.Manifest;
+import android.app.Activity;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.ServiceConnection;
+import android.content.pm.PackageManager;
 import android.os.Bundle;
 import android.os.IBinder;
 import android.util.Log;
         @Override
         public void onServiceDisconnected(ComponentName name) {}
     };
+
+
+    private boolean hasPermissions() {
+        return ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED &&
+                ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED;
+    }
+    private void getPermissions() {
+        if (!hasPermissions())
+            ActivityCompat.requestPermissions((Activity) this, new String[]{android.Manifest.permission.CAMERA, Manifest.permission.RECORD_AUDIO}, 12345);
+    }
 }