相机无法对焦

Question

Android应用程序，一切正常，但相机无法对焦，散布效果糟透了，尽管不应如此

我不知道哪里是错误

public class QRCodeScannerActivity extends AppCompatActivity {

    SurfaceView cameraSurfaceView;
    TextView scanDescriptionTextView;
    BarcodeDetector barcodeDetector;
    CameraSource cameraSource;
    final int requestCameraPermissionID = 1001;

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode) {
            case requestCameraPermissionID: {
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {

                        return;
                    }
                    try {
                        cameraSource.takePicture();

                        cameraSource.start(cameraSurfaceView.getHolder());
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_qrcode_scanner);

        cameraSurfaceView = (SurfaceView) findViewById(R.id.cameraSurfaceView);
        scanDescriptionTextView = (TextView) findViewById(R.id.ScanDescriptionTextView);

        barcodeDetector = new BarcodeDetector.Builder(this).setBarcodeFormats(Barcode.QR_CODE).build();
        cameraSource = new CameraSource.Builder(this, barcodeDetector).setRequestedPreviewSize(1980, 1024).build();
        //Add Event
        cameraSurfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder surfaceHolder) {
                if (ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                    //Request Permission
                    ActivityCompat.requestPermissions(QRCodeScannerActivity.this, new String[]{Manifest.permission.CAMERA}, requestCameraPermissionID);
                    return;
                }
                try{
                  cameraSource.start(cameraSurfaceView.getHolder());


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

            }

            @Override
            public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {

            }

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

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

            }

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

                    scanDescriptionTextView.post(new Runnable() {
                        @Override
                        public void run() {
                            Vibrator vibrator = (Vibrator)getApplicationContext().getSystemService(Context.VIBRATOR_SERVICE);
                            vibrator.vibrate(1000);
                            scanDescriptionTextView.setText("Result : " + qrcode.valueAt(0).displayValue);
                        }
                    });
                }
            }
        });
    }
}

这是一个处理QR码的应用程序，除了聚焦相机外，我已经做了所有事情，该怎么办？我不知道

相机应该清晰可见，并能看到QR码。