Bagi Scanner

One more application with free source code that you can download, these applications are air-theme-kan BARCODE. This application is able to scan the barcode with various types including:

BarcodeFormat.UPC_A
BarcodeFormat.UPC_E
BarcodeFormat.EAN_13
BarcodeFormat.EAN_8
BarcodeFormat.RSS_14
BarcodeFormat.CODE_39
BarcodeFormat.CODE_93
BarcodeFormat.CODE_128
BarcodeFormat.ITF
BarcodeFormat.CODABAR
BarcodeFormat.QR_CODE
BarcodeFormat.DATA_MATRIX
BarcodeFormat.PDF_417

This application uses https://github.com/dm77/barcodescanner plugin and you can also download the source code for free in http://bagicode.com/.

May be useful :)