How to Scan a QR Code from an Image in a Gallery Using the Xcodescanner Library in an Android App?


BarcodeBC > Articles > How to Scan a QR Code from an Image in a Gallery Using the Xcodescanner Library in an Android App?


Scan a QR Code from an Image in a Gallery Using the Xcodescanner Library in an Android App

To scan a QR Code from an image in a gallery using the XCodeScanner library in an Android app, you can follow the steps below.

1. Add the XCodeScanner library to your project by including the following dependency in your app's build.gradle file.


dependencies {
    implementation 'com.budiyev.android:xrecyclerview:1.4.4'
    implementation 'com.budiyev.android:code-scanner:2.2.0'
}

2. In your activity or fragment, create an instance of CodeScanner and set its decodeCallback to handle the result of the QR Code scan.


private CodeScanner mCodeScanner;
private CodeScannerView scannerView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    scannerView = findViewById(R.id.scanner_view);
    mCodeScanner = new CodeScanner(this, scannerView);
    mCodeScanner.setDecodeCallback(result -> {
        // handle the result of the QR Code scan
        Log.d("TAG", "QR Code result: " + result.getText());
    });
}

3. Override the onActivityResult method to get the URI of the selected image from the gallery and pass it to the decodeBitmap method of CodeScanner.


@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == REQUEST_CODE_PICK_IMAGE && resultCode == RESULT_OK && data != null) {
        try {
            Uri selectedImage = data.getData();
            InputStream imageStream = getContentResolver().openInputStream(selectedImage);
            Bitmap bitmap = BitmapFactory.decodeStream(imageStream);
            mCodeScanner.decodeBitmap(bitmap);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}

4. Start the image picker activity when the user wants to select an image from the gallery.


private static final int REQUEST_CODE_PICK_IMAGE = 100;

private void pickImageFromGallery() {
    Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(intent, REQUEST_CODE_PICK_IMAGE);
}

5. Set up the UI for the QR Code scanner view, including a button or other user interface element that allows the user to select an image from the gallery.


@Override
protected void onResume() {
    super.onResume();
    mCodeScanner.startPreview();
}

@Override
protected void onPause() {
    mCodeScanner.releaseResources();
    super.onPause();
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == R.id.action_pick_image) {
        pickImageFromGallery();
        return true;
    }
    return super.onOptionsItemSelected(item);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

With these steps, you should now be able to scan QR Codes from images in a gallery using the XCodeScanner library in your Android app.



How to Scan a QR Code from an Image in a Gallery Using Our Barcode Reader Library?

The XCodeScanner library is specifically designed for scanning QR Codes using the camera. When selecting an image from the gallery, the library may not work as expected.

To scan QR Codes from an image in the gallery in .NET applications, you can use another barcode reader librarylike BC.NetBarcodeReader.All. Here are steps on how to use BC.NetBarcodeReader.All to decode a QR Code from an image in a gallery.

1. Load the image from the gallery and convert it to a Bitmap object.

2. Create an instance of BC.NetBarcodeReader.All class.

3. Call the Recognize method of the instance with the Bitmap object as the parameter.

4. Check the result to see if it contains any QR Codes.

Here is an example code.


using BC.NetBarcodeReaderTrial.All;

// Load the image from the gallery and convert it to a Bitmap object
Bitmap bitmap = BitmapFactory.DecodeFile(filePath);

// Create an instance of BC.NetBarcodeReader.All class
ReadOneBarcodeTypefromImage();

// Call the Recognize method with the Bitmap object as the parameter
Result[] results = NetBarcodeReader.Recognize(bitmap);

// Check the result to see if it contains any QR Codes
if (results != null && results.Length > 0)
{
    foreach (Result result in results)
    {
        if (result.BarcodeFormat == BarcodeFormat.QR_CODE)
        {
            string text = result.Text;
            // Do something with the scanned QR Code text
        }
    }
}
else
{
    // No QR Codes found in the image
}

Note: Make sure to include the BarcodeBC.com .NET Barcode Reader Library in your project before using it. Moreover, we also provide .NET barcode reader library for PDF file and .NET Core barcode reader library.