MlKit demo sample code snippets

BarCodeScannerDemo.java

 implementation 'com.google.firebase:firebase-ml-vision:18.0.1'
 
 <meta-data
      android:name="com.google.firebase.ml.vision.DEPENDENCIES"
      android:value="barcode" />
      

 // To initialise the detector

 FirebaseVisionBarcodeDetectorOptions options =
              new FirebaseVisionBarcodeDetectorOptions.Builder()
                  .setBarcodeFormats(FirebaseVisionBarcode.FORMAT_QR_CODE)
                  .build();

 FirebaseVisionBarcodeDetector detector = FirebaseVision.getInstance()
                 .getVisionBarcodeDetector(options);
                 
                 
                 
 // // To create the FirebaseVisionImage 
        
 FirebaseVisionImageMetadata metadata =
             new FirebaseVisionImageMetadata.Builder()
                 .setFormat(FirebaseVisionImageMetadata.IMAGE_FORMAT_NV21)
                 .setWidth(frameMetadata.getWidth())
                 .setHeight(frameMetadata.getHeight())
                 .setRotation(frameMetadata.getRotation())
                 .build();

Bitmap bitmap = BitmapUtils.getBitmap(data, frameMetadata);

FirebaseVisionImage firebaseVisionImage=FirebaseVisionImage.fromByteBuffer(data, metadata);


// To connect the camera resource with the detector

mCameraSource = new CameraSource(this, barcodeOverlay);
mCameraSource.setFacing(CameraSource.CAMERA_FACING_BACK);

barcodeScanningProcessor = new BarcodeScanningProcessor(detector);
barcodeScanningProcessor.setBarcodeResultListener(getBarcodeResultListener());

mCameraSource.setMachineLearningFrameProcessor(barcodeScanningProcessor);


// To detect the barcodes from the image

@Override
protected Task<List<FirebaseVisionBarcode>> detectInImage(FirebaseVisionImage image) {
   return detector.detectInImage(image);
}


// To decode the results

BarcodeResultListener barcodeResultListener = new BarcodeResultListener() {
     @Override
     public void onSuccess(@Nullable Bitmap originalCameraImage, @NonNull List<FirebaseVisionBarcode> barcodes, 
                           @NonNull FrameMetadata frameMetadata, @NonNull GraphicOverlay graphicOverlay) {
                
      Log.d(TAG, "onSuccess: " + barcodes.size());

      for (FirebaseVisionBarcode barCode : barcodes)
      {

          // To get the raw response from the result
          
          Log.d(TAG, "onSuccess: " + barCode.getRawValue());
          Log.d(TAG, "onSuccess: " + barCode.getFormat());
          Log.d(TAG, "onSuccess: " + barCode.getValueType());

          // To get the parsed data
          
          FirebaseVisionBarcode.ContactInfo contactInfo = barCode.getContactInfo();

          Log.d(TAG, "Title: "+contactInfo.getTitle());
          Log.d(TAG, "Phone number: "+contactInfo.getPhones().get(0).getNumber());
          Log.d(TAG, "Email: "+contactInfo.getEmails().get(0).getAddress());
          Log.d(TAG, "Address: "+contactInfo.getAddresses().get(0).getAddressLines()[0]);

          String[] urlList = contactInfo.getUrls();
          Log.d(TAG, "Web: " + urlList[0]);
                    
      }
     }
     @Override
     public void onFailure(@NonNull Exception e) {

     }
  };