How to generate a QR Code for an Android application

Question

I need to create a qrcode in my android application  and I need a library or source code that lets me create a QR Code in an Android app   The library I need must    not leave a watermark  like onbarcode library  not use web service API to create the qrcode  like Google s library zxing  not need 3rd party installers  like QR Droid    I already created such code for iPhone  Objective-C  but I need a quick fix for Android until I have time to make a QR Code generator of my own  It s my first android project so any help will be appreciated

User · Accepted Answer

Have you looked into ZXING  I ve been using it successfully to create barcodes  You can see a full working example in the bitcoin application src     this is a small sample use of the QRCodeEncoder class from zxing try          generate a 150x150 QR code     Bitmap bm   encodeAsBitmap barcode content  BarcodeFormat QR CODE  150  150        if bm    null            image view setImageBitmap bm           catch  WriterException e      eek

User · Answer

with zxing this is my code for create QR   QRCodeWriter writer   new QRCodeWriter        try           BitMatrix bitMatrix   writer encode content  BarcodeFormat QR CODE  512  512           int width   bitMatrix getWidth            int height   bitMatrix getHeight            Bitmap bmp   Bitmap createBitmap width  height  Bitmap Config RGB 565           for  int x   0  x  lt  width  x                  for  int y   0  y  lt  height  y                      bmp setPixel x  y  bitMatrix get x  y    Color BLACK   Color WHITE                                     ImageView  findViewById R id img result qr   setImageBitmap bmp          catch  WriterException e            e printStackTrace

User · Answer

zxing does not  only  provide a web API  really  that is Google providing the API  from source code that was later open-sourced in the project   As Rob says here you can use the Java source code for the QR code encoder to create a raw barcode and then render it as a Bitmap   I can offer an easier way still  You can call Barcode Scanner by Intent to encode a barcode  You need just a few lines of code  and two classes from the project  under android-integration  The main one is IntentIntegrator  Just call shareText

User · Answer

Here is my simple and working function to generate a Bitmap  I Use ZXing1 3 jar only  I ve also set Correction Level to High   PS  x and y are reversed  it s normal  because bitMatrix reverse x and y  This code works perfectly with a square image   public static Bitmap generateQrCode String myCodeText  throws WriterException       Hashtable lt EncodeHintType  ErrorCorrectionLevel gt  hintMap   new Hashtable lt EncodeHintType  ErrorCorrectionLevel gt         hintMap put EncodeHintType ERROR CORRECTION  ErrorCorrectionLevel H      H   30  damage      QRCodeWriter qrCodeWriter   new QRCodeWriter         int size   256       ByteMatrix bitMatrix   qrCodeWriter encode myCodeText BarcodeFormat QR CODE  size  size  hintMap       int width   bitMatrix width        Bitmap bmp   Bitmap createBitmap width  width  Bitmap Config RGB 565       for  int x   0  x  lt  width  x              for  int y   0  y  lt  width  y                  bmp setPixel y  x  bitMatrix get x  y   0   Color BLACK   Color WHITE                       return bmp      EDIT  It s faster to use bitmap setPixels      with a pixel int array instead of bitmap setPixel one by one           BitMatrix bitMatrix   writer encode inputValue  BarcodeFormat QR CODE  size  size           int width   bitMatrix getWidth            int height   bitMatrix getHeight            int   pixels   new int width   height           for  int y   0  y  lt  height  y                  int offset   y   width              for  int x   0  x  lt  width  x                      pixels offset   x    bitMatrix get x  y    BLACK   WHITE                                   bitmap   Bitmap createBitmap width  height  Bitmap Config ARGB 8888           bitmap setPixels pixels  0  width  0  0  width  height

User · Answer

I used zxing-1 3 jar and I had to make some changes implementing code from other answers  so I will leave my solution for others  I did the following   1  find zxing-1 3 jar  download it and add in properties  add external jar    2  in my activity layout add ImageView and name it  in my example it was tnsd iv qr    3  include code in my activity to create qr image  in this example I was creating QR for bitcoin payments        QRCodeWriter writer   new QRCodeWriter        ImageView tnsd iv qr    ImageView findViewById R id tnsd iv qr       try           ByteMatrix bitMatrix   writer encode  bitcoin   btc acc adress   amount   amountBTC  BarcodeFormat QR CODE  512  512           int width   512          int height   512          Bitmap bmp   Bitmap createBitmap width  height  Bitmap Config RGB 565           for  int x   0  x  lt  width  x                  for  int y   0  y  lt  height  y                      if  bitMatrix get x  y   0                      bmp setPixel x  y  Color BLACK                   else                     bmp setPixel x  y  Color WHITE                                   tnsd iv qr setImageBitmap bmp         catch  WriterException e              Log e  QR ERROR      e            If someone is wondering  variable  btc acc adress  is a String  with BTC adress   amountBTC is a double  with  of course  transaction amount

User · Answer

Maybe this old topic but i found this library is very helpful and easy to use     QRGen  example for using it in android     Bitmap myBitmap   QRCode from  www example org   bitmap    ImageView myImage    ImageView  findViewById R id imageView   myImage setImageBitmap myBitmap

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