How to developed barcode scanner with lookup value in appinventor which supports barcode symbologies:
UPC-A, UPC-E, EAN-8, EAN-13, GS1 DataBar (a.k.a. RSS) Code 39, Code 93, Code 128, GS1-128, Codabar, ITF-14 QR Code, Data Matrix, Aztec, PDF 417.
Did you tried the native BarcodeScanner component?
Or have you meet any problem?