Android force BarCode scanner to scan only BarCodes

Question

I have an Android app, where it simply scans the Barcode and this is working fine.

The problem is, sometimes if I have my phone during scanning turned to carpet in my room, or even a PC keyboard, it scans it and shows random numbers. The app thinks that it is some kind of Barcode and throws a random number.

The code works perfectly with Barcodes, but it scans also some other surfaces randomly (not always, but happens quite often).

Part of my code:

  private void initialiseDetectorsAndSources() {

        BarcodeDetector barcodeDetector = new BarcodeDetector.Builder(this)
                .setBarcodeFormats(Barcode.EAN_8 | Barcode.EAN_13)
                .build();

        cameraSource = new CameraSource.Builder(this, barcodeDetector)
                .setRequestedPreviewSize(1920, 1080)
                .setAutoFocusEnabled(true)
                .build();

        surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder holder) {

                try {
                    if (ActivityCompat.checkSelfPermission(AddOsivo.this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
                        cameraSource.start(surfaceView.getHolder());
                    } else {
                        ActivityCompat.requestPermissions(AddOsivo.this, new
                                String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA_PERMISSION);
                    }

                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
            }

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
                cameraSource.stop();
            }
        });


        barcodeDetector.setProcessor(new Detector.Processor<Barcode>() {
            @Override
            public void release() {
            }

            @Override
            public void receiveDetections(@NonNull Detector.Detections<Barcode> detections) {
                final SparseArray<Barcode> barcodes = detections.getDetectedItems();
                if (barcodes.size() != 0) {

                    barcodeText.post(() -> {

                        barcodeData = barcodes.valueAt(0).displayValue;
                        barcodeText.setText(barcodeData);
                        toneGen1.startTone(ToneGenerator.TONE_CDMA_ONE_MIN_BEEP, 150);

                        cameraSource.stop();

                        EditText ean = findViewById(R.id.barcode_text);
                        String eantext = ean.getText().toString();


                         });
                }
            }
        });
    }

As you can see, I tried to use setBarcodeFormats(Barcode.EAN_8 | Barcode.EAN_13) which should limit the scanner to all Barcode types only, so I am not sure, why it thinks, that my keyboard or carpet is a barcode :)

Using this detector library:

import com.google.android.gms.vision.CameraSource;
import com.google.android.gms.vision.Detector;
import com.google.android.gms.vision.barcode.Barcode;
import com.google.android.gms.vision.barcode.BarcodeDetector;

Any suggestions?