Readded main and main xml

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

@@ -1,14 +1,88 @@
 package com.example.ueberwachungssystem;
 
+import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.camera.view.PreviewView;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
+import androidx.camera.core.ExperimentalGetImage;
 
+import android.Manifest;
+import android.content.pm.PackageManager;
 import android.os.Bundle;
+import android.view.View;
+import android.widget.TextView;
+import android.widget.Toast;
+import android.widget.ToggleButton;
 
+import com.example.ueberwachungssystem.Detection.DetectionReport;
+import com.example.ueberwachungssystem.Detection.Detector;
+import com.example.ueberwachungssystem.Detection.VideoDetector;
+
+@ExperimentalGetImage
 public class MainActivity extends AppCompatActivity {
 
+    private static final int CAMERA_PERMISSION_REQUEST_CODE = 101;
+
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+
+        TextView textView = findViewById(R.id.textView);
+        PreviewView previewView = findViewById(R.id.previewView);
+
+
+        VideoDetector vd = new VideoDetector(this);
+        vd.setPreviewView(previewView);
+        vd.setOnDetectionListener(new Detector.OnDetectionListener(){
+            @Override
+            public void onDetection(@NonNull DetectionReport detectionReport) {
+                detectionReport.log("OnDetection");
+                textView.setText(detectionReport.toString());
+            }
+        });
+        //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() {
+        return ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED;
+    }
+
+    private void getCameraAccess() {
+        if (!isCameraAccessAllowed())
+            ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.CAMERA}, CAMERA_PERMISSION_REQUEST_CODE);
+    }
+
+    @Override
+    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+
+        if (requestCode == CAMERA_PERMISSION_REQUEST_CODE && grantResults.length > 0) {
+            boolean cameraRights = grantResults[0] == PackageManager.PERMISSION_GRANTED;
+            if (cameraRights) {
+                Toast.makeText(this, "camera permission granted", Toast.LENGTH_LONG).show();
+            } else {
+                Toast.makeText(this, "camera permission denied", Toast.LENGTH_LONG).show();
+            }
+        }
     }
 }

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

@@ -1,18 +1,37 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:layout_gravity="center"
+    android:gravity="center"
+    android:orientation="vertical"
     tools:context=".MainActivity">
 
     <TextView
+        android:id="@+id/textView"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
+        android:text=""
+        android:textSize="15dp"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
-</androidx.constraintlayout.widget.ConstraintLayout>
+
+    <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"/>
+
+</LinearLayout>