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

Answer 1

In android studio, You can use bellow process to create & Read QR Code &image look like bellw

1. Create a android studio empty project

2. Add library in app.gradle

   compile 'com.google.zxing:core:3.2.1'
   compile 'com.journeyapps:zxing-android-embedded:3.2.0@aar'
   

3. In activity.main xml use bellow..

4. 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 < bitMatrixHeight; y++) {
         int offset = y * bitMatrixWidth;
   
        for (int x = 0; x < 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);
        }
      }
    }
   

5. You can download full source code from GitHub. GitHub link is : https://github.com/enamul95/QRCode