Rebuild Demo in Main Activity

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

 
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
-import androidx.camera.core.Camera;
-import androidx.camera.core.CameraSelector;
-import androidx.camera.core.Preview;
-import androidx.camera.lifecycle.ProcessCameraProvider;
 import androidx.camera.view.PreviewView;
 import androidx.core.app.ActivityCompat;
 import androidx.core.content.ContextCompat;
 import androidx.camera.core.ExperimentalGetImage;
-import androidx.lifecycle.LifecycleOwner;
 
 import android.Manifest;
 import android.content.pm.PackageManager;
+import android.graphics.Color;
 import android.os.Bundle;
-import android.util.Log;
 import android.view.View;
-import android.widget.Button;
 import android.widget.TextView;
 import android.widget.Toast;
+import android.widget.ToggleButton;
 
 import com.example.ueberwachungssystem.VideoDetection.DetectionReport;
 import com.example.ueberwachungssystem.VideoDetection.VideoDetector;
-import com.google.common.util.concurrent.ListenableFuture;
-
-import java.util.Calendar;
-import java.util.concurrent.ExecutionException;
 
 @ExperimentalGetImage
 public class MainActivity extends AppCompatActivity {
     private static final int CAMERA_PERMISSION_REQUEST_CODE = 101;
     private PreviewView previewView;
     private TextView textView;
-    private Button previewButton;
+    private ToggleButton toggleButton;
     private Boolean cameraPreviewIsRunning = false;
     private Boolean isPressed = false;
 
 
         textView = findViewById(R.id.textView);
         previewView = findViewById(R.id.previewView);
-        previewButton = findViewById(R.id.previewButton);
+        toggleButton = findViewById(R.id.previewButton);
 
 
         VideoDetector vd = new VideoDetector(this);
             @Override
             public void onDetection(DetectionReport detectionReport) {
                 detectionReport.log("OnDetection");
+                textView.setText(detectionReport.toString());
             }
         });
-        vd.startDetection();
+        //vd.startDetection();
 
 
-        previewButton.setOnClickListener(new View.OnClickListener() {
+        toggleButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 getCameraAccess();
-                if (isCameraAccessAllowed() && !isPressed)
+                if (isCameraAccessAllowed() && toggleButton.isChecked())
                 {
-                    vd.stopDetection();
-                    isPressed = true;
-                }
-                else if (isCameraAccessAllowed() && isPressed) {
                     vd.startDetection();
-                    isPressed = false;
+                }
+                else {
+                    vd.stopDetection();
                 }
             }
         });

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

         this.detectorID = detectorID;
     }
 
+
+    /** Get Detection Report in String format */
+    public String toString() {
+        String time = "Time: " + "[" + this.timeStamp + "]";
+        String type = "Type: " + "[" + this.detectionType + "]";
+        String value = "Value: " + "[" + this.detectedValue + "]";
+        String id = "ID: " + "[" + this.detectorID + "]";
+
+        return String.join("\t", time, type, value, id);
+    }
+
     /** Debug Report */
     public void log(String tag) {
-        String time = "Time: [" + this.timeStamp + "]";
-        String type = "Type: [" + this.detectionType + "]";
-        String value = "Value: [" + this.detectedValue + "]";
-        String id = "ID: [" + this.detectorID + "]";
-
-        String message = String.join("\t", time, type, value, id);
-        Log.d(tag, message);
+        Log.d(tag, this.toString());
     }
 }

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

     // Preview Camera Image
     private PreviewView previewView = null;
     // Check Violation
-    private final float DELTA_LUMINOSITY_THRESHOLD = 0.5f;
-    private float previousLuminosity = 0f;
+    private final float DELTA_LUMINOSITY_THRESHOLD = 0.3f;
+    private Float previousLuminosity = null;
     // On Detection Listener
     private OnDetectionListener listener;
 
                     // Analyze frame
                     float luminosity = calculateLuminosity(image);
                     Log.d("Video Detector", String.valueOf(luminosity));
-                    checkForViolation(luminosity, previousLuminosity);
+                    if (previousLuminosity != null)
+                        checkForViolation(luminosity, previousLuminosity);
                     previousLuminosity = luminosity;
                 }
                 imageProxy.close();
             preview.setSurfaceProvider(previewView.getSurfaceProvider());
 
         cameraProvider.bindToLifecycle((LifecycleOwner) context, cameraSelector, imageAnalysis, preview);
+        stopDetection();
     }
 
 

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

         android:id="@+id/textView"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
+        android:text=""
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
-    <Button
+
+    <ToggleButton
         android:id="@+id/previewButton"
-        android:layout_width="wrap_content"
+        android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:text="Button"
-        tools:layout_editor_absoluteX="156dp"
-        tools:layout_editor_absoluteY="189dp" />
+        android:text="ToggleButton" />
+
 
     <androidx.camera.view.PreviewView
         android:id="@+id/previewView"
         android:layout_width="match_parent"
-        android:layout_height="match_parent" />
+        android:layout_height="match_parent"
+        android:backgroundTint="@android:color/black"/>
 
 </LinearLayout>