Binary Eye

Works in portrait and landscape orientation, can read inverted codes, is Material Design and can also generate barcodes.

Uses the ZXing ("Zebra Crossing") barcode scanning library. Supported barcode formats are: AZTEC, CODABAR, CODE 39, CODE 93, CODE 128, DATA MATRIX, EAN 8, EAN 13, ITF, MAXICODE, PDF417, QR CODE, RSS 14, RSS EXPANDED, UPC A, UPC E and UPC EAN EXTENSION.

This is open source:
https://github.com/markusfisch/BinaryEye