Zxing Scan from large photo

When using the Zxing Open Source Library, found that the larger picture cannot be scanned successfully, reported the following exception:

Com.google.zxing.NotFoundException

The above problem can be solved by the scale down bitmap, 720 is a magic number that can be adjusted according to your own project

The bitmap if it is bigger than we need.int width = bm.getwidth (); int height = bm.getheight (); final int Targ Etwidth = 720, Targetheight = 720;if (Width > Targetwidth | | height > targetheight) {    float scale = 0.0f;    if (width >= height) {scale    = (float) targetwidth/width;    } else {scale        = (float) Targetheight/hei ght;    }    int w = math.round (scale * width);    int h = math.round (scale * height);    BM = BITMAP.CREATESCALEDBITMAP (BM, W, H, true);}

Compare the complete code as follows:

... new Qrcodescantask (PicturePath). Execute (); Private class Qrcodescantask extends Asynctask<void, Void, Result        > {private String ImagePath;        Private ProgressDialog Mprogressdialog;        Public Qrcodescantask (String imagePath) {this.imagepath = ImagePath;            } @Override public void OnPreExecute () {mprogressdialog = new ProgressDialog (mactivity);            Mprogressdialog.setmessage (mactivity.getstring (r.string.qrcode_scanning));        Mprogressdialog.show ();  Public Result doinbackground (Void ... params) {try{Multiformatreader Multiformatreader                = new Multiformatreader ();                Bitmap BM = bitmapfactory.decodefile (ImagePath);                The bitmap if it is bigger than we need.                int width = bm.getwidth ();                int height = bm.getheight ();                Final int targetwidth = 720, targetheight = 720; if (width> Targetwidth | |                    Height > Targetheight) {float scale = 0.0f;                    if (width >= height) {scale = (float) targetwidth/width;                    } else {scale = (float) targetheight/height;                    } int w = math.round (scale * width);                    int h = math.round (scale * height);                BM = BITMAP.CREATESCALEDBITMAP (BM, W, H, true); } Result result = Multiformatreader.decodewithstate (new Binarybitmap (New hybridbinarize                R (New Bitmapluminancesource (BM)));            return result;            } catch (Exception e) {return null;            }} @Override public void OnPostExecute (result result) {Mprogressdialog.dismiss ();      if (result = = null) toast.maketext (mactivity, R.string.qrcode_notfound, Toast.length_short). Show ();      else Handleqrcoderesult (result); }    }

Ps:

1. There are related discussions here https://code.google.com/p/zxing/issues/detail?id=513

2. zxing GitHub link:https://github.com/zxing/zxing/

Zxing Scan from large photo