Android How to read QR code in my application

Question

In my application I need to read Qr code  I searched the net and found Zing codes however lots of developers had problem with using it and it seems it is buggy   If i assume that my customers has qr reader installed on their device  how can i use those applications and call them via implicit intents    if user doesn t have any qr reader  what will happen to the application  if it crashes  may i ask user to download for example QrDroid and after that use it

User · Answer

Zxing is an excellent library to perform Qr code scanning and generation. The following implementation uses Zxing library to scan the QR code image Don't forget to add following dependency in the build.gradle

implementation 'me.dm7.barcodescanner:zxing:1.9'

Code scanner activity:

    public class QrCodeScanner extends AppCompatActivity implements ZXingScannerView.ResultHandler {
        private ZXingScannerView mScannerView;

        @Override
        public void onCreate(Bundle state) {
            super.onCreate(state);
            // Programmatically initialize the scanner view
            mScannerView = new ZXingScannerView(this);
            // Set the scanner view as the content view
            setContentView(mScannerView);
        }

        @Override
        public void onResume() {
            super.onResume();
            // Register ourselves as a handler for scan results.
            mScannerView.setResultHandler(this);
            // Start camera on resume
            mScannerView.startCamera();
        }

        @Override
        public void onPause() {
            super.onPause();
            // Stop camera on pause
            mScannerView.stopCamera();
        }

        @Override
        public void handleResult(Result rawResult) {
            // Do something with the result here
            // Prints scan results
            Logger.verbose("result", rawResult.getText());
            // Prints the scan format (qrcode, pdf417 etc.)
            Logger.verbose("result", rawResult.getBarcodeFormat().toString());
            //If you would like to resume scanning, call this method below:
            //mScannerView.resumeCameraPreview(this);
            Intent intent = new Intent();
            intent.putExtra(AppConstants.KEY_QR_CODE, rawResult.getText());
            setResult(RESULT_OK, intent);
            finish();
        }
    }

User · Answer

if user doesn t have any qr reader  what will happen to the application  if it crashes  may i ask user to download for example QrDroid and after that use it   Interestingly  Google now introduced Mobile Vision APIs  they are integrated in play services itself  In your Gradle file just add  compile  com google android gms play-services-vision 11 4 0   Taken from this QR code tutorial  UPDATE 2020  Now QR code scanning is also a part of ML Kit  so you can bundle the model inside the app and use it by integrating the following gradle dependency  dependencies                 Use this dependency to bundle the model with your app   implementation  com google mlkit barcode-scanning 16 0 3     Or you can use the following gradle dependency to dynamically download the models from Google Play Services  dependencies                 Use this dependency to use the dynamically downloaded model in Google Play Services   implementation  com google android gms play-services-mlkit-barcode-scanning 16 1 2     Taken from this link

User · Answer

In android studio  You can use bellow process to create  amp  Read QR Code   amp image look like bellw    Create a android studio empty project Add library in app gradle  compile  com google zxing core 3 2 1  compile  com journeyapps zxing-android-embedded 3 2 0 aar   In activity main xml use bellow      lt  xml version  1 0  encoding  utf-8   gt    lt LinearLayout xmlns android  http   schemas android com apk res android   xmlns app  http   schemas android com apk res-auto   xmlns tools  http   schemas android com tools   android layout width  match parent   android layout height  match parent   tools context  com example enamul qrcode MainActivity  gt    lt LinearLayout   android layout width  match parent    android layout height  match parent    android layout margin  20dp    android orientation  vertical  gt     lt EditText     android id    id editText      android layout width  fill parent      android layout height  wrap content      android gravity  center      android hint  Enter Text Here    gt    lt Button     android id    id button      android layout width  fill parent      android layout height  50dp      android layout below    id editText      android text  Click Here TO generate qr code      android textAllCaps  false      android textSize  16sp    gt     lt Button     android id    id btnScan      android layout width  fill parent      android layout height  50dp      android layout below    id editText      android text  Scan Your QR Code      android textAllCaps  false      android textSize  16sp    gt    lt TextView     android id    id tv qr readTxt      android layout width  match parent      android layout height  wrap content    gt     lt ImageView     android id    id imageView      android layout width  match parent      android layout height  200dp      android layout below    id button      android src   android drawable ic dialog email    gt     lt  LinearLayout gt    lt  LinearLayout gt   In MainActivity you can use bellow code  public class MainActivity extends AppCompatActivity     ImageView imageView    Button button    Button btnScan    EditText editText    String EditTextValue     Thread thread     public final static int QRcodeWidth   350     Bitmap bitmap      TextView tv qr readTxt     Override  protected void onCreate Bundle savedInstanceState      super onCreate savedInstanceState     setContentView R layout activity main        imageView    ImageView findViewById R id imageView       editText    EditText findViewById R id editText       button    Button findViewById R id button       btnScan    Button findViewById R id btnScan        tv qr readTxt    TextView  findViewById R id tv qr readTxt    button setOnClickListener new View OnClickListener          Override     public void onClick View view               if  editText getText   toString   isEmpty                 EditTextValue   editText getText   toString                 try                   bitmap   TextToImageEncode EditTextValue                    imageView setImageBitmap bitmap                  catch  WriterException e                    e printStackTrace                                    else              editText requestFocus                Toast makeText MainActivity this   Please Enter Your Scanned Test    Toast LENGTH LONG  show                               btnScan setOnClickListener new View OnClickListener          Override     public void onClick View view             IntentIntegrator integrator   new IntentIntegrator MainActivity this           integrator setDesiredBarcodeFormats IntentIntegrator ALL CODE TYPES           integrator setPrompt  Scan            integrator setCameraId 0           integrator setBeepEnabled false           integrator setBarcodeImageEnabled false           integrator initiateScan                            Bitmap TextToImageEncode String Value  throws WriterException      BitMatrix bitMatrix      try       bitMatrix   new MultiFormatWriter   encode              Value              BarcodeFormat DATA MATRIX QR CODE              QRcodeWidth  QRcodeWidth  null               catch  IllegalArgumentException Illegalargumentexception          return null         int bitMatrixWidth   bitMatrix getWidth       int bitMatrixHeight   bitMatrix getHeight       int   pixels   new int bitMatrixWidth   bitMatrixHeight      for  int y   0  y  lt  bitMatrixHeight  y            int offset   y   bitMatrixWidth        for  int x   0  x  lt  bitMatrixWidth  x                pixels offset   x    bitMatrix get x  y                    getResources   getColor R color QRCodeBlackColor  getResources   getColor R color QRCodeWhiteColor                     Bitmap bitmap   Bitmap createBitmap bitMatrixWidth  bitMatrixHeight  Bitmap Config ARGB 4444       bitmap setPixels pixels  0  350  0  0  bitMatrixWidth  bitMatrixHeight      return bitmap           Override   protected void onActivityResult int requestCode  int resultCode  Intent data        IntentResult result   IntentIntegrator parseActivityResult requestCode  resultCode  data     if result    null        if result getContents      null            Log e  Scan           Cancelled scan            else           Log e  Scan    Scanned             tv qr readTxt setText result getContents             Toast makeText this   Scanned      result getContents    Toast LENGTH LONG  show               else            This is important  otherwise the result will not be passed to the fragment     super onActivityResult requestCode  resultCode  data                   You can download full source code from GitHub  GitHub link is    https   github com enamul95 QRCode

User · Answer

try        Intent intent   new Intent  com google zxing client android SCAN        intent putExtra  SCAN MODE    QR CODE MODE        PRODUCT MODE for bar codes      startActivityForResult intent  0      catch  Exception e         Uri marketUri   Uri parse  market   details id com google zxing client android        Intent marketIntent   new Intent Intent ACTION VIEW marketUri       startActivity marketIntent        and in onActivityResult      Override protected void onActivityResult int requestCode  int resultCode  Intent data                   super onActivityResult requestCode  resultCode  data       if  requestCode    0             if  resultCode    RESULT OK                String contents   data getStringExtra  SCAN RESULT                      if resultCode    RESULT CANCELED                 handle cancel

User · Answer

Easy QR Code Library  A simple Android Easy QR Code Library  It is very easy to use  to use this library follow these steps   For Gradle   Step 1  Add it in your root build gradle at the end of repositories   allprojects       repositories                       maven   url  https   jitpack io              Step 2  Add the dependency   dependencies           compile  com github mrasif easyqrlibrary v1 0 0      For Maven   Step 1  Add the JitPack repository to your build file    lt repositories gt       lt repository gt           lt id gt jitpack io lt  id gt           lt url gt https   jitpack io lt  url gt       lt  repository gt   lt  repositories gt    Step 2  Add the dependency    lt dependency gt       lt groupId gt com github mrasif lt  groupId gt       lt artifactId gt easyqrlibrary lt  artifactId gt       lt version gt v1 0 0 lt  version gt   lt  dependency gt    For SBT   Step 1  Add the JitPack repository to your build sbt file   resolvers     jitpack  at  https   jitpack io    Step 2  Add the dependency   libraryDependencies     com github mrasif     easyqrlibrary     v1 0 0    For Leiningen   Step 1  Add it in your project clj at the end of repositories    repositories    jitpack   https   jitpack io      Step 2  Add the dependency    dependencies   com github mrasif easyqrlibrary  v1 0 0      Add this in your layout xml file    lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout xmlns android  http   schemas android com apk res android      xmlns app  http   schemas android com apk res-auto      xmlns tools  http   schemas android com tools      android layout width  match parent      android layout height  match parent      android padding  20dp      tools context   MainActivity      android orientation  vertical  gt        lt TextView         android id    id tvData          android layout width  match parent          android layout height  wrap content          android gravity  center          android text  No QR Data   gt       lt Button         android id    id btnQRScan          android layout width  wrap content          android layout height  wrap content          android text  QR Scan   gt    lt  LinearLayout gt    Add this in your activity java files   public class MainActivity extends AppCompatActivity implements View OnClickListener       TextView tvData      Button btnQRScan        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main           tvData findViewById R id tvData           btnQRScan findViewById R id btnQRScan            btnQRScan setOnClickListener this               Override     public void onClick View view           switch  view getId                 case R id btnQRScan                    Intent intent new Intent MainActivity this  QRScanner class                   startActivityForResult intent  EasyQR QR SCANNER REQUEST                 break                        Override     protected void onActivityResult int requestCode  int resultCode  Intent data            super onActivityResult requestCode  resultCode  data           switch  requestCode               case EasyQR QR SCANNER REQUEST                    if  resultCode  RESULT OK                       tvData setText data getStringExtra EasyQR DATA                                    break                      For customized scanner screen just add these lines when you start the scanner Activity   Intent intent new Intent MainActivity this  QRScanner class   intent putExtra EasyQR IS TOOLBAR SHOW true   intent putExtra EasyQR TOOLBAR DRAWABLE ID R drawable ic audiotrack dark   intent putExtra EasyQR TOOLBAR TEXT  My QR    intent putExtra EasyQR TOOLBAR BACKGROUND COLOR   0588EE    intent putExtra EasyQR TOOLBAR TEXT COLOR   FFFFFF    intent putExtra EasyQR BACKGROUND COLOR   000000    intent putExtra EasyQR CAMERA MARGIN LEFT 50   intent putExtra EasyQR CAMERA MARGIN TOP 50   intent putExtra EasyQR CAMERA MARGIN RIGHT 50   intent putExtra EasyQR CAMERA MARGIN BOTTOM 50   startActivityForResult intent  EasyQR QR SCANNER REQUEST     You are done  Ref  Link  https   mrasif github io easyqrlibrary

User · Answer

Use a QR library like ZXing    I had very good experience with it  QrDroid is much buggier  If you must rely on an external reader  rely on a standard one like Google Goggles

User · Answer

I ve created a simple example tutorial  You can read this and use in your application   http   ribinsandroidhelper blogspot in 2013 03 qr-code-reading-on-your-application html  Through this link you can download the qrcode library project and import into your workspace and add library to your project  and copy this code to your activity   Intent intent   new Intent  com google zxing client android SCAN     startActivityForResult intent  0     public void onActivityResult int requestCode  int resultCode  Intent intent         if  requestCode    0             if  resultCode    RESULT OK                 String contents   intent getStringExtra  SCAN RESULT                 String format   intent getStringExtra  SCAN RESULT FORMAT                 Toast makeText this  contents Toast LENGTH LONG  show                    Handle successful scan            else if  resultCode    RESULT CANCELED                   Handle cancel

[android] Android, How to read QR code in my application?

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