app/src/main/AndroidManifest.xml

@@ -3,10 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools">
 
     <uses-feature android:name="android.hardware.camera"/>
-    <uses-permission android:name="android.permission.CAMERA" />
-    <uses-permission android:name="android.permission.RECORD_AUDIO" />
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
-    <uses-feature android:name="android.hardware.Camera"/>
+    <uses-permission android:name="android.permission.CAMERA"/>
 
     <application
         android:allowBackup="true"

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

@@ -10,20 +10,17 @@ import androidx.camera.core.ExperimentalGetImage;
 import android.Manifest;
 import android.content.pm.PackageManager;
 import android.os.Bundle;
-import android.util.Log;
 import android.view.View;
 import android.widget.TextView;
 import android.widget.Toast;
 import android.widget.ToggleButton;
-import android.widget.VideoView;
 
 import com.example.ueberwachungssystem.VideoDetection.VideoDetector;
 
 @ExperimentalGetImage
 public class MainActivity extends AppCompatActivity {
 
-    private static final int CAMERA_PERMISSION_REQUEST_CODE = 100;
-    private static final int RECORD_VIDEO_PERMISSION_REQUEST_CODE = 102;
+    private static final int CAMERA_PERMISSION_REQUEST_CODE = 101;
 
 
     @Override
@@ -34,7 +31,6 @@ public class MainActivity extends AppCompatActivity {
         TextView textView = findViewById(R.id.textView);
         PreviewView previewView = findViewById(R.id.previewView);
 
-        getCameraAccess();
 
         VideoDetector vd = new VideoDetector(this);
         vd.setPreviewView(previewView);
@@ -42,11 +38,27 @@ public class MainActivity extends AppCompatActivity {
             @Override
             public void onDetection(@NonNull DetectionReport detectionReport) {
                 detectionReport.log("OnDetection");
-                textView.setText("Alarm:\t[" + String.valueOf(detectionReport.detectedValue) + "]");
+                textView.setText(detectionReport.toString());
             }
         });
-        vd.startDetection();
+        //vd.startDetection();
 
+
+        ToggleButton toggleButton = findViewById(R.id.previewButton);
+        toggleButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                getCameraAccess();
+                if (isCameraAccessAllowed() && toggleButton.isChecked())
+                {
+                    vd.startDetection();
+                }
+                else {
+                    vd.stopDetection();
+                    textView.setText("");
+                }
+            }
+        });
     }
 
     private boolean isCameraAccessAllowed() {
@@ -65,9 +77,9 @@ public class MainActivity extends AppCompatActivity {
         if (requestCode == CAMERA_PERMISSION_REQUEST_CODE && grantResults.length > 0) {
             boolean cameraRights = grantResults[0] == PackageManager.PERMISSION_GRANTED;
             if (cameraRights) {
-                Toast.makeText(this, "permission granted", Toast.LENGTH_LONG).show();
+                Toast.makeText(this, "camera permission granted", Toast.LENGTH_LONG).show();
             } else {
-                Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
+                Toast.makeText(this, "camera permission denied", Toast.LENGTH_LONG).show();
             }
         }
     }

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

@@ -33,7 +33,7 @@ public class VideoDetector extends Detector {
     private PreviewView previewView = null;
     // Detect Violation
     private static final float PIXEL_THRESHOLD = 30f;  // Luminosity (brightness channel of YUV_420_888)
-    private static final float ALARM_THRESHOLD = 0.5f;   // Percent of pixels changed
+    private static final float ALARM_THRESHOLD = 1f;   // Percent of pixels changed
     private ByteBuffer previousBuffer = null;
 
 
@@ -117,7 +117,6 @@ public class VideoDetector extends Detector {
         if (previewView != null)
             preview.setSurfaceProvider(previewView.getSurfaceProvider());
 
-        cameraProvider.unbindAll();
         cameraProvider.bindToLifecycle((LifecycleOwner) context, cameraSelector, imageAnalysis, preview);
     }
 

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

@@ -14,21 +14,24 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text=""
-        android:textSize="30sp"
+        android:textSize="20dp"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
 
+    <ToggleButton
+        android:id="@+id/previewButton"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="ToggleButton" />
 
 
     <androidx.camera.view.PreviewView
         android:id="@+id/previewView"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:backgroundTint="@android:color/black">
-
-    </androidx.camera.view.PreviewView>
+        android:backgroundTint="@android:color/black"/>
 
 </LinearLayout>