I want to decode QR code which was set into imageView. I tried the following code.
BitmapDrawable drawable = (BitmapDrawable) imageView.getDrawable();
Bitmap bitmap = drawable.getBitmap();
QRCodeReader reader = new QRCodeReader();
Result result = reader.decode(bitmap);
but it says it wants BinaryBitmap instead of Bitmap. What should I do?
Thanks in advance.
You could use this class MultiFormatReader from ZXing library.
Bitmap bMap = [...];
String contents = null;
int[] intArray = new int[bMap.getWidth()*bMap.getHeight()];
//copy pixel data from the Bitmap into the 'intArray' array
bMap.getPixels(intArray, 0, bMap.getWidth(), 0, 0, bMap.getWidth(), bMap.getHeight());
LuminanceSource source = new RGBLuminanceSource(bMap.getWidth(), bMap.getHeight(), intArray);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Reader reader = new MultiFormatReader();
Result result = reader.decode(bitmap);
contents = result.getText();
I think it refers to the fact that you need to pass the byte64 converted image ( bitmap to string of bytes)
You can do this like this :
private String bitmapToBase64(Bitmap bitmap) {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream);
byte[] byteArray = byteArrayOutputStream .toByteArray();
return Base64.encodeToString(byteArray, Base64.DEFAULT);
}
After that if you need back the bitmap from the byte array you can reverse the process like this :
private Bitmap base64ToBitmap(String b64) {
byte[] imageAsBytes = Base64.decode(b64.getBytes(), Base64.DEFAULT);
return BitmapFactory.decodeByteArray(imageAsBytes, 0, imageAsBytes.length);
}
add library to app.gradle
compile 'com.google.zxing:core:3.2.1'
compile 'com.journeyapps:zxing-android-embedded:3.2.0@aar'
In the MainActivity use following 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);
}
}
}
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