Android Question how to exclude unnecessary scanner triggers in this example ?

Hello,
There is a good example of a scanner in this link.
But I can't solve one problem: - When scanning barcodes, especially ean-13, the same barcode is detected up to 10 times. How can I pause after the first barcode detection for at least 3 seconds to eliminate unnecessary repeated definitions of the same barcode. Blocking repetitions of values is not suitable, since sometimes you need to scan the same barcodes, but for this there should be a pause from false positives.
Many thanks to all those who are not indifferent!