Android，如何读取我的应用程序中的二维码

xml

groovy
implementation 'com.google.zxing:core:3.4.1'
implementation 'com.journeyapps:zxing-android-embedded:4.2.0'

java
private SurfaceView surfaceView;
private TextView resultTextView;
private CameraSource cameraSource;
private BarcodeDetector barcodeDetector;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_scan_qr_code);
    surfaceView = findViewById(R.id.surfaceView);
    resultTextView = findViewById(R.id.resultTextView);
    barcodeDetector = new BarcodeDetector.Builder(this)
            .setBarcodeFormats(Barcode.QR_CODE)
            .build();
    cameraSource = new CameraSource.Builder(this, barcodeDetector)
            .setAutoFocusEnabled(true)
            .build();
    surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            // 打开相机并开始预览
            try {
                if (ActivityCompat.checkSelfPermission(ScanQRCodeActivity.this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
                    cameraSource.start(holder);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        }
        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
            // 释放相机资源
            cameraSource.stop();
        }
    });
    barcodeDetector.setProcessor(new Detector.Processor() {
        @Override
        public void release() {
        }
        @Override
        public void receiveDetections(Detector.Detections detections) {
            SparseArray barcodes = detections.getDetectedItems();
            if (barcodes.size() > 0) {
                String qrCodeValue = barcodes.valueAt(0).displayValue;
                resultTextView.setText(qrCodeValue);
            }
        }
    });
}