Nrthugu

I have integrated ZBar library for QR scanner. But it didn't work perfectly in one of my devices. The camera does not focus automatically on specifically Samsung Galaxy J7+ phone. We have checked in other phones like Motorola, Xiomi, Oneplus and it's working fine.
So can anyone suggest what changes should I make?
Here is my code.

    @Override

    protected void onStart() {

        super.onStart();

        initCamera();

    }



    @Override

    protected void onStop() {

        super.onStop();

        releaseCamera();

    }



    private void initCamera() {



        autoFocusHandler = new Handler();

        mCamera = getCameraInstance();



        /* Instance barcode scanner */

        scanner = new ImageScanner();

        scanner.setConfig(0, Config.X_DENSITY, 1);

        scanner.setConfig(0, Config.Y_DENSITY, 1);

        scanner.setConfig(0, Config.ENABLE, 0);

        // Only enable the codes your app requires

        scanner.setConfig(Symbol.QRCODE, Config.ENABLE, 1);



        CameraPreview mPreview = new CameraPreview(this, mCamera, previewCb, getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_AUTOFOCUS) ? autoFocusCB : null);



        if (mBinding.preview.getChildCount() > 0) {

            mBinding.preview.removeAllViews();

        }

        mBinding.preview.addView(mPreview);

    }



    /**

     * A safe way to get an instance of the Camera object.

     */

    public static Camera getCameraInstance() {

        Camera c = null;

        try {

            c = Camera.open();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return c;

    }



    private void releaseCamera() {

        if (mCamera != null) {

            previewing = false;

            mCamera.setPreviewCallback(null);

            mCamera.release();

            mCamera = null;

        }

    }



    private Runnable doAutoFocus = new Runnable() {

        public void run() {

            if (previewing)

                mCamera.autoFocus(autoFocusCB);

        }

    };



    Camera.PreviewCallback previewCb = new Camera.PreviewCallback() {

        public void onPreviewFrame(byte data, Camera camera) {

            Camera.Parameters parameters = camera.getParameters();

            Camera.Size size = parameters.getPreviewSize();



            Image barcode = new Image(size.width, size.height, "Y800");

            barcode.setData(data);



            int result = scanner.scanImage(barcode);



            if (result != 0) {

                previewing = false;

                mCamera.setPreviewCallback(null);

                mCamera.stopPreview();



                SymbolSet syms = scanner.getResults();

                for (Symbol sym : syms) {

                    final String code = sym.getData();               

                }

            }

        }

    };



    // Mimic continuous auto-focusing

    Camera.AutoFocusCallback autoFocusCB = new Camera.AutoFocusCallback() {

        public void onAutoFocus(boolean success, Camera camera) {

            autoFocusHandler.postDelayed(doAutoFocus, 1000);

        }

    };