Как прочитать код 39 с помощью zxing в Android?

Если вы используете Android Studio, добавьте эти зависимости:

compile 'me.dm7.barcodescanner:zxing:1.8.3'
compile 'com.journeyapps:zxing-android-embedded:3.0.2@aar'
compile 'com.google.zxing:core:3.2.0'

Zxing Автоматически принимает тип кода при сканировании

integrator.setDesiredBarcodeFormats(IntentIntegrator.ALL_CODE_TYPES) 

Здесь учитываются все типы кодов по умолчанию

Если вам нужен конкретный QR, просто

integrator.setDesiredBarcodeFormats(IntentIntegrator.QR_CODE_TYPES);

Используйте следующий код-

import me.dm7.barcodescanner.zxing.ZXingScannerView;

public class YourActivity extends Activity {


//Barcode Scanning
private ZXingScannerView mScannerView;


// This is your click listener
public void checkBarcode(View v) {
    try {
        IntentIntegrator integrator = new IntentIntegrator(GateEntryActivity.this);
        integrator.setDesiredBarcodeFormats(IntentIntegrator.ALL_CODE_TYPES);
        integrator.setPrompt("Scan a barcode");
        integrator.setCameraId(0);  // Use a specific camera of the device
        integrator.setBeepEnabled(false);
        integrator.initiateScan();
        //start the scanning activity from the com.google.zxing.client.android.SCAN intent
        // Programmatically initialize the scanner view
        // setContentView(mScannerView);
    } catch (ActivityNotFoundException anfe) {
        //on catch, show the download dialog
        showDialog(GateEntryActivity.this, "No Scanner Found", "Download a scanner code activity?", "Yes", "No").show();
    }
}


//alert dialog for downloadDialog
private static AlertDialog showDialog(final Activity act, CharSequence title, CharSequence message, CharSequence buttonYes, CharSequence buttonNo) {
    AlertDialog.Builder downloadDialog = new AlertDialog.Builder(act);
    downloadDialog.setTitle(title);
    downloadDialog.setMessage(message);
    downloadDialog.setPositiveButton(buttonYes, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialogInterface, int i) {
            Uri uri = Uri.parse("market://search?q=pname:" + "com.google.zxing.client.android");
            Intent intent = new Intent(Intent.ACTION_VIEW, uri);
            try {
                act.startActivity(intent);
            } catch (ActivityNotFoundException anfe) {

            }
        }
    });
    downloadDialog.setNegativeButton(buttonNo, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialogInterface, int i) {
        }
    });
    return downloadDialog.show();
}

//on ActivityResult method
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
    if (result != null) {
        if (result.getContents() == null) {
            Log.d("MainActivity", "Cancelled scan");
            Toast.makeText(this, "Cancelled", Toast.LENGTH_LONG).show();
        } else {
            Log.d("MainActivity", "Scanned");
            Toast.makeText(this, "Scanned: " + result.getContents(), Toast.LENGTH_LONG).show();                
        }
    } else {
        Log.d("MainActivity", "Weird");
        // This is important, otherwise the result will not be passed to the fragment
        super.onActivityResult(requestCode, resultCode, data);
    }
}

}