public long getTimestamp() {
        return mResult.getTimestamp();
    }
@return {@link Map} mapping {@link ResultMetadataType} keys to values. May be
{@code null}. This contains optional metadata about what was detected about the barcode,
like orientation.
@see Result#getResultMetadata()
zxing-android-embedded/src/com/journeyapps/barcodescanner/BarcodeResult.java