Qr
A QR Code symbol, which is a type of two-dimension barcode. Invented by Denso Wave and described in the ISO/IEC 18004 standard.
Instances of this class represent an immutable square grid of dark and light cells. The class provides static factory functions to create a QR Code from text or binary data. The class covers the QR Code Model 2 specification, supporting all versions (sizes) from 1 to 40, all 4 error correction levels, and 4 character encoding modes.
Ways to create a QR Code object:
High level: Take the payload data and call QrCode.encodeText or QrCode.encodeBinary.
Mid level: Custom-make the list of segments and call QrCode.encodeSegments or QrCode.encodeSegments
Low level: Custom-make the array of data codeword bytes (including segment headers and final padding, excluding error correction codewords), supply the appropriate version number, and call the constructor.
(Note that all ways require supplying the desired error correction level.)
Parameters
The version number of this QR Code, which is between 1 and 40 (inclusive). This determines the size of this barcode.
The error correction level used in this QR Code.