Barcode detector minor issue

[klaus78]

in this code txtView is not defined yet (Will be defined in the next piece of code but should be defined here)

BarcodeDetector detector = 
    new BarcodeDetector.Builder(getApplicationContext())
                        .setBarcodeFormats(Barcode.DATA_MATRIX | Barcode.QR_CODE)
                        .build();
if(!detector.isOperational()){
   txtView.setText("Could not set up the detector!");
   return;
}