com.google.zxing.qrcode

## Class QRCodeReader

- java.lang.Object
- - com.google.zxing.qrcode.QRCodeReader

- All Implemented Interfaces:
    Reader
  Direct Known Subclasses:
    QRCodeMultiReader

      public class QRCodeReader
      extends Object
      implements Reader

  This implementation can detect and decode QR Codes in an image.
  Author:
    Sean Owen

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `QRCodeReader()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `Result` | `decode(BinaryBitmap image)` Locates and decodes a QR code in an image.
    `Result` | `decode(BinaryBitmap image, Map<DecodeHintType,?> hints)` Locates and decodes a barcode in some format within an image.
    `protected Decoder` | `getDecoder()`
    `void` | `reset()` Resets any internal state the implementation has after a decode, to prepare it for reuse.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### QRCodeReader

          public QRCodeReader()

  - ### Method Detail

    - #### getDecoder

          protected final Decoder getDecoder()

    - #### decode

          public Result decode(BinaryBitmap image)
                        throws NotFoundException,
                               ChecksumException,
                               FormatException

      Locates and decodes a QR code in an image.
      Specified by:
        `decode` in interface `Reader`
      Parameters:
        `image` - image of barcode to decode
      Returns:
        a String representing the content encoded by the QR code
      Throws:
        `NotFoundException` - if a QR code cannot be found
        `FormatException` - if a QR code cannot be decoded
        `ChecksumException` - if error correction fails

    - #### decode

          public final Result decode(BinaryBitmap image,
                                     Map<DecodeHintType,?> hints)
                              throws NotFoundException,
                                     ChecksumException,
                                     FormatException

      Description copied from interface: `Reader`
      Locates and decodes a barcode in some format within an image. This method also accepts hints, each possibly associated to some data, which may help the implementation decode.
      Specified by:
        `decode` in interface `Reader`
      Parameters:
        `image` - image of barcode to decode
        `hints` - passed as a `Map` from `DecodeHintType` to arbitrary data. The meaning of the data depends upon the hint type. The implementation may or may not do anything with these hints.
      Returns:
        String which the barcode encodes
      Throws:
        `NotFoundException` - if no potential barcode is found
        `ChecksumException` - if a potential barcode is found but does not pass its checksum
        `FormatException` - if a potential barcode is found but format is invalid

    - #### reset

          public void reset()

      Description copied from interface: `Reader`
      Resets any internal state the implementation has after a decode, to prepare it for reuse.
      Specified by:
        `reset` in interface `Reader`

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