app/build.gradle

@@ -36,13 +36,4 @@ dependencies {
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.5'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
-
-    // Required for CameraX
-    def camerax_version = "1.2.2"
-    implementation "androidx.camera:camera-core:${camerax_version}"
-    implementation "androidx.camera:camera-camera2:${camerax_version}"
-    implementation "androidx.camera:camera-lifecycle:${camerax_version}"
-    implementation "androidx.camera:camera-video:${camerax_version}"
-    implementation "androidx.camera:camera-view:${camerax_version}"
-    implementation "androidx.camera:camera-extensions:${camerax_version}"
 }

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

@@ -2,69 +2,38 @@ package com.example.ueberwachungssystem;
 
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
-import androidx.camera.core.Camera;
-import androidx.camera.core.CameraSelector;
-import androidx.camera.core.ImageAnalysis;
-import androidx.camera.core.ImageProxy;
-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.app.AlertDialog;
+import android.content.DialogInterface;
 import android.content.pm.PackageManager;
-import android.graphics.ImageFormat;
-import android.media.Image;
 import android.os.Bundle;
-import android.util.Log;
-import android.util.Size;
 import android.view.View;
 import android.widget.Button;
-import android.widget.TextView;
 import android.widget.Toast;
 
-import com.google.common.util.concurrent.ListenableFuture;
-
-import java.nio.ByteBuffer;
-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 Boolean cameraPreviewIsRunning = false;
-
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
-        textView = findViewById(R.id.textView);
-        previewView = findViewById(R.id.previewView);
-        previewButton = findViewById(R.id.previewButton);
 
-
+        Button B1 = findViewById(R.id.B1);
-        VideoDetector vd = new VideoDetector(this);
+        B1.setOnClickListener(new View.OnClickListener() {
-
-        previewButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                getCameraAccess();
+                    getCameraAccess();
-                if (isCameraAccessAllowed())
-                    vd.runImageAnalysis();
             }
         });
     }
 
 
-
     private boolean isCameraAccessAllowed() {
         return ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED;
     }
@@ -88,38 +57,17 @@ public class MainActivity extends AppCompatActivity {
         }
     }
 
-
+    private void showDialogue(String message) {
-    private void previewCamera() {
+        new AlertDialog.Builder(this)
-        // Request Camera Access
+                .setMessage(message)
-        getCameraAccess();
+                .setPositiveButton("OK", new DialogInterface.OnClickListener() {
-        // Return when Camera Access not allowed or Camera Preview is running
+                    @Override
-        if (!isCameraAccessAllowed() || cameraPreviewIsRunning)
+                    public void onClick(DialogInterface dialog, int which) {
-            return;
+                        requestPermissions(new String[] {Manifest.permission.CAMERA}, CAMERA_PERMISSION_REQUEST_CODE);
-        // Camera Preview is running
-        cameraPreviewIsRunning = true;
-        // Request Camera Provider
-        final ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(this);
-        //Check for Camera availability
-        cameraProviderFuture.addListener(new Runnable() {
-                @Override
-                public void run() {
-                    try {
-                        ProcessCameraProvider cameraProvider = cameraProviderFuture.get();
-                        bindPreview(cameraProvider);
-                    } catch (ExecutionException | InterruptedException e) {
-                        // No errors need to be handled for this Future. This should never be reached.
                     }
-                }
+                })
-            },ContextCompat.getMainExecutor(this));
+                .setNegativeButton("Cancel", null)
-    }
+                .create()
-
+                .show();
-    private void bindPreview(@NonNull ProcessCameraProvider cameraProvider) {
-        // Create Preview
-        Preview preview = new Preview.Builder().build();
-        // Specify which Camera to use
-        CameraSelector cameraSelector = new CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build();
-        // Connect Preview to PreviewView
-        preview.setSurfaceProvider(previewView.getSurfaceProvider());
-        Camera camera = cameraProvider.bindToLifecycle((LifecycleOwner)this, cameraSelector, preview);
     }
 }

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

@@ -1,106 +0,0 @@
-package com.example.ueberwachungssystem;
-
-import android.content.Context;
-import android.graphics.ImageFormat;
-import android.media.Image;
-import android.util.Log;
-import android.util.Size;
-
-import androidx.annotation.NonNull;
-import androidx.camera.core.CameraSelector;
-import androidx.camera.core.ExperimentalGetImage;
-import androidx.camera.core.ImageAnalysis;
-import androidx.camera.core.ImageProxy;
-import androidx.camera.core.Preview;
-import androidx.camera.lifecycle.ProcessCameraProvider;
-import androidx.core.content.ContextCompat;
-import androidx.lifecycle.LifecycleOwner;
-
-import com.google.common.util.concurrent.ListenableFuture;
-
-import java.nio.ByteBuffer;
-import java.util.concurrent.ExecutionException;
-
-
-@ExperimentalGetImage
-public class VideoDetector {
-
-    private final Context context;
-    private float currentLuminosity;
-
-
-    public VideoDetector(Context context) {
-        this.context = context;
-    }
-
-    public void runImageAnalysis() {
-        // Request Camera Provider
-        final ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(context);
-        //Check for Camera availability
-        cameraProviderFuture.addListener(new Runnable() {
-            @Override
-            public void run() {
-                try {
-                    ProcessCameraProvider cameraProvider = cameraProviderFuture.get();
-                    bindImageAnalysis(cameraProvider);
-                } catch (ExecutionException | InterruptedException e) {
-                    // No errors need to be handled for this Future. This should never be reached.
-                }
-            }
-        },ContextCompat.getMainExecutor(context));
-    }
-
-    private void bindImageAnalysis(@NonNull ProcessCameraProvider cameraProvider) {
-        // Configure and create Image Analysis
-        ImageAnalysis.Builder builder = new ImageAnalysis.Builder();
-        builder.setTargetResolution(new Size(640, 480));
-        builder.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST);
-        ImageAnalysis imageAnalysis = builder.build();
-
-        // Set Analyzer
-        imageAnalysis.setAnalyzer(ContextCompat.getMainExecutor(context), new ImageAnalysis.Analyzer() {
-            @Override
-            public void analyze(@NonNull ImageProxy imageProxy) {
-                if (imageProxy.getFormat() == ImageFormat.YUV_420_888) {
-                    Image image = imageProxy.getImage();
-                    assert image != null;
-
-                    float luminosity = calculateLuminosity(image);
-                    currentLuminosity = luminosity;
-                    Log.d("Video Detector", String.valueOf(luminosity));
-                }
-                imageProxy.close();
-            }
-        });
-        // Create Preview
-        Preview preview = new Preview.Builder().build();
-        // Specify which Camera to use
-        CameraSelector cameraSelector = new CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build();
-        // Connect Preview to PreviewView
-        cameraProvider.bindToLifecycle((LifecycleOwner) context, cameraSelector, imageAnalysis, preview);
-    }
-
-
-    private float calculateLuminosity (Image image) {
-        int width = image.getWidth();
-        int height = image.getHeight();
-
-        Image.Plane[] planes = image.getPlanes();
-        ByteBuffer luminosityBuffer = planes[0].getBuffer();
-
-        int yRowStride = image.getPlanes()[0].getRowStride();
-        int yPixelStride = image.getPlanes()[0].getPixelStride();
-
-        int luminosity;
-        float sum = 0;
-
-        for (int y = 0; y < height; ++y) {
-            for (int x = 0; x < width; x++) {
-                int index = (y * yRowStride) + (x * yPixelStride);
-                luminosity = (luminosityBuffer.get(index) & 0xff);
-                sum += luminosity;
-            }
-        }
-        return sum / (width * height);
-    }
-}

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

@@ -10,7 +10,6 @@
     tools:context=".MainActivity">
 
     <TextView
-        android:id="@+id/textView"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="Hello World!"
@@ -20,16 +19,11 @@
         app:layout_constraintTop_toTopOf="parent" />
 
     <Button
-        android:id="@+id/previewButton"
+        android:id="@+id/B1"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="Button"
         tools:layout_editor_absoluteX="156dp"
         tools:layout_editor_absoluteY="189dp" />
 
-    <androidx.camera.view.PreviewView
-        android:id="@+id/previewView"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent" />
-
 </LinearLayout>