Zxing Scan Frame deformation problem

Look at the picture.

/** * Calculates the most appropriate preview interface size from the camera's supported resolution * * @param parameters * @param screenresolution * @return */private Point Findbestpreviewsiz Evalue (camera.parameters Parameters, point screenresolution) {list<camera.size> rawsupportedsizes = Parameters.    Getsupportedpreviewsizes (); if (rawsupportedsizes = = null) {LOG.W (TAG, "Device returned no supported preview sizes;        Using default ");        Camera.size defaultsize = Parameters.getpreviewsize ();    return new Point (Defaultsize.width, defaultsize.height); }//Sort by size, descending list<camera.size> supportedpreviewsizes = new Arraylist<camera.size> (rawSu    pportedsizes); Collections.sort (supportedpreviewsizes, New comparator<camera.size> () {@Override public int compare (C Amera.            Size A, camera.size b) {int apixels = a.height * a.width;            int bpixels = B.height * b.width;            if (Bpixels < apixels) {return-1; } if (bpixels> Apixels) {return 1;        } return 0; }    });

//if (Log.isloggable (TAG, Log.info)) {
//StringBuilder previewsizesstring = new StringBuilder ();
//For (Camera.size supportedpreviewsize:supportedpreviewsizes) {
//Previewsizesstring.append ( supportedpreviewsize.width). Append (' x '). Append (Supportedpreviewsize.height). Append (");
//}
//LOG.I (TAG, "Supported preview sizes:" + previewsizesstring);
//}

    Double screenaspectratio = (double) screenresolution.x/(double) screenresolution.y;    Remove sizes that is unsuitable iterator<camera.size> it = supportedpreviewsizes.iterator ();        while (It.hasnext ()) {Camera.size supportedpreviewsize = It.next ();        int realwidth = Supportedpreviewsize.width;        int realheight = Supportedpreviewsize.height;            if (Realwidth * Realheight < Min_preview_pixels) {it.remove ();        Continue        } Boolean iscandidateportrait = Realwidth < realheight; int maybeflippedwidth = iscandidateportrait?        Realheight:realwidth; int maybeflippedheight = iscandidateportrait?        Realwidth:realheight;        Double aspectratio = (double) maybeflippedwidth/(double) maybeflippedheight;        Double distortion = Math.Abs (aspectratio-screenaspectratio);            if (Distortion > Max_aspect_distortion) {it.remove ();        Continue } if (MaybeflippeDwidth = = Screenresolution.x && maybeflippedheight = = screenresolution.y) {Point exactpoint = new Poin            T (Realwidth, realheight);            LOG.I (TAG, "Found Preview size exactly matching screen size:" + exactpoint);        return exactpoint; }}//If No exact match, use largest preview size. This is a great//idea on older devices because//of the additional computation needed.    We ' re likely to get here on//newer Android 4+ devices, where//The CPUs are much more powerful.        if (!supportedpreviewsizes.isempty ()) {Camera.size Largestpreview = supportedpreviewsizes.get (0);        Point largestsize = new Point (Largestpreview.width, largestpreview.height);        LOG.I (TAG, "Using largest suitable preview size:" + largestsize);    return largestsize; }//If There is no at all suitable, return to current preview size camera.size Defaultpreview = Parameters.getpre    Viewsize (); Point defaultsize = new Point (dEfaultpreview.width, Defaultpreview.height);    LOG.I (TAG, "No suitable preview sizes, using default:" + defaultsize); return defaultsize;}

zxing Scan Box deformation problem