public final void initiateScan(Collection<String> desiredBarcodeFormats) {
        setDesiredBarcodeFormats(desiredBarcodeFormats);
        initiateScan();
    }
Initiates a scan, only for a certain set of barcode types, given as strings corresponding
to their names in ZXing's {@code BarcodeFormat} class like "UPC_A". You can supply constants
like {@link #PRODUCT_CODE_TYPES} for example.

@param desiredBarcodeFormats names of {@code BarcodeFormat}s to scan for
zxing-android-embedded/src/com/google/zxing/integration/android/IntentIntegrator.java