Android google mobile vision api 打开相机和手电筒

Question

我正在使用 android google barcode vision API，我可以完美地检测到我的 QR 码。我怎样才能同时打开手电筒。晚上需要扫描二维码。这是我到目前为止的工作代码

public class fragment_qrscan extends myFragment {

    SurfaceView cameraPreview;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragment_qrscan, container, false);

        cameraPreview = (SurfaceView)view.findViewById(R.id.camera_preview);

        createCameraSource();

        return view;
    }


    private void createCameraSource() {

        BarcodeDetector barcodeDetector = new BarcodeDetector.Builder(getActivity()).build();
        final CameraSource cameraSource = new CameraSource.Builder(getActivity(),barcodeDetector)
                .setAutoFocusEnabled(true)
                .setRequestedPreviewSize(1600,1024)
                .build();

        cameraPreview.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                try {
                    if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                        ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.CAMERA}, 1);
                    }

                    cameraSource.start(cameraPreview.getHolder());

                } catch (Exception 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(Detector.Detections<Barcode> detections) {

                final SparseArray<Barcode> barcodes = detections.getDetectedItems();
                if (barcodes.size() >0) {
                    Log.i("myStuff",String.valueOf(barcodes.valueAt(0).displayValue));
                }
            }
        });

    }
}

一切都运行良好我只是不知道如何正确打开手电筒并仍然使用移动视觉 api。任何帮助或建议将不胜感激。

Answer 1

这是我的完整解决方案。通过包含 CameraSource.java 类 found here在我的项目中。我可以扫描二维码，也可以打开和关闭相机手电筒。

public class fragment_qrscan extends myFragment {

    SurfaceView cameraPreview;
    private CameraSource mCameraSource;
    private Button btnLight;
    boolean lightOn = false;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragment_qrscan, container, false);

        cameraPreview = (SurfaceView) view.findViewById(R.id.camera_preview);
        btnLight = (Button) view.findViewById(R.id.btnLight);

        btnLight.setOnClickListener(
                new View.OnClickListener() {
                    public void onClick(View v) {
                        btnLightClicked();
                    }
                }
        );

        createCameraSource(true, false);

        return view;
    }

    private void btnLightClicked() {

       if (!lightOn) {
            mCameraSource.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
           lightOn = true;

       }
        else {
           mCameraSource.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
           lightOn = false;
       }
    }

    @SuppressLint("InlinedApi")
    private void createCameraSource(boolean autoFocus, boolean useFlash) {
        Context context = getActivity().getApplicationContext();
        BarcodeDetector barcodeDetector = new BarcodeDetector.Builder(context).build();
        CameraSource.Builder builder = new CameraSource.Builder(getActivity().getApplicationContext(), barcodeDetector)
                .setFacing(CameraSource.CAMERA_FACING_BACK)
                .setRequestedPreviewSize(1600, 1024)
                .setRequestedFps(15.0f);
        // make sure that auto focus is an available option
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
            builder = builder.setFocusMode(
                    autoFocus ? Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE : null);
        }

        mCameraSource = builder
                .setFlashMode(useFlash ? Camera.Parameters.FLASH_MODE_TORCH : null)
                .build();

    cameraPreview.getHolder().addCallback(new SurfaceHolder.Callback() {
        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            try {
                if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                    ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.CAMERA}, 1);
                }

                mCameraSource.start(cameraPreview.getHolder());

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

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

        }

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {

            mCameraSource.stop();
        }
    });

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

        }

        @Override
        public void receiveDetections(Detector.Detections<Barcode> detections) {

            final SparseArray<Barcode> barcodes = detections.getDetectedItems();
            if (barcodes.size() >0) {
                Log.i("myStuff",String.valueOf(barcodes.valueAt(0).displayValue));
            }
        }
    });

    }
}

我确信有一个更简洁的解决方案，但目前这段代码运行良好，自动对焦设置为 true 扫描二维码如此快速和容易，这真的很酷。即使在 3 英尺外，代码也能立即被检测到。