com.google.zxing

## Class MultiFormatReader

- java.lang.Object
- - com.google.zxing.MultiFormatReader

- All Implemented Interfaces:
    Reader

      public final class MultiFormatReader
      extends Object
      implements Reader

  MultiFormatReader is a convenience class and the main entry point into the library for most uses. By default it attempts to decode all barcode formats that the library supports. Optionally, you can provide a hints object to request different behavior, for example only decoding QR codes.
  Author:
    Sean Owen, dswitkin@google.com (Daniel Switkin)

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `MultiFormatReader()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `Result` | `decode(BinaryBitmap image)` This version of decode honors the intent of Reader.decode(BinaryBitmap) in that it passes null as a hint to the decoders.
    `Result` | `decode(BinaryBitmap image, Map<DecodeHintType,?> hints)` Decode an image using the hints provided.
    `Result` | `decodeWithState(BinaryBitmap image)` Decode an image using the state set up by calling setHints() previously.
    `void` | `reset()` Resets any internal state the implementation has after a decode, to prepare it for reuse.
    `void` | `setHints(Map<DecodeHintType,?> hints)` This method adds state to the MultiFormatReader.

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

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

- - ### Constructor Detail

    - #### MultiFormatReader

          public MultiFormatReader()

  - ### Method Detail

    - #### decode

          public Result decode(BinaryBitmap image)
                        throws NotFoundException

      This version of decode honors the intent of Reader.decode(BinaryBitmap) in that it passes null as a hint to the decoders. However, that makes it inefficient to call repeatedly. Use setHints() followed by decodeWithState() for continuous scan applications.
      Specified by:
        `decode` in interface `Reader`
      Parameters:
        `image` - The pixel data to decode
      Returns:
        The contents of the image
      Throws:
        `NotFoundException` - Any errors which occurred

    - #### decode

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

      Decode an image using the hints provided. Does not honor existing state.
      Specified by:
        `decode` in interface `Reader`
      Parameters:
        `image` - The pixel data to decode
        `hints` - The hints to use, clearing the previous state.
      Returns:
        The contents of the image
      Throws:
        `NotFoundException` - Any errors which occurred

    - #### decodeWithState

          public Result decodeWithState(BinaryBitmap image)
                                 throws NotFoundException

      Decode an image using the state set up by calling setHints() previously. Continuous scan clients will get a large speed increase by using this instead of decode().
      Parameters:
        `image` - The pixel data to decode
      Returns:
        The contents of the image
      Throws:
        `NotFoundException` - Any errors which occurred

    - #### setHints

          public void setHints(Map<DecodeHintType,?> hints)

      This method adds state to the MultiFormatReader. By setting the hints once, subsequent calls to decodeWithState(image) can reuse the same set of readers without reallocating memory. This is important for performance in continuous scan clients.
      Parameters:
        `hints` - The set of hints to use for subsequent calls to decode(image)

    - #### 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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