zxing 中 Reader 的 reset() - android

reset() of Reader in zxing - android

我在 GitHub 上查看 zxing 存储库已经好几个小时了。 androidtestBenchmarkAsyncTask 遍历文件路径,并在不调用 reader.

reset() 的情况下连续解码一些图像文件

但是Reader.reset的评论里说

Resets any internal state the implementation has after a decode, to prepare it for reuse.

既然我们重用了multiFormatReader,难道我们不应该调用reset()吗?

如果你一步步调试 ZXing 源代码,你会看到 reset() 对除了 RSS14ReaderRSSExpandedReader[=26 之外的所有阅读器什么都不做=].

什么都不做:

@Override
  public void reset() {
    // do nothing
  }

RSS14Reader.reset():

@Override
  public void reset() {
    possibleLeftPairs.clear();
    possibleRightPairs.clear();
  }

RSSExpandedReader.reset()

@Override
  public void reset() {
    this.pairs.clear();
    this.rows.clear();
  }

如果你只是想看二维码,没有区别。例如:

String[] fileNames = new String[]{"qrcode-1.jpg", "qrcode-2.jpg"};
File file = null;
BufferedImage image = null;
RGBLuminanceSource source = null;
BinaryBitmap bitmap = null;
Result result = null;
MultiFormatReader reader = new MultiFormatReader();

try {
    for (String fileName : fileNames) {
        file = new File(fileName);
        image = ImageIO.read(file);
        System.out.println(image.getWidth() + ", " + image.getHeight());
        int[] pixels = image.getRGB(0, 0, image.getWidth(), image.getHeight(), null, 0, image.getWidth());
        source = new RGBLuminanceSource(image.getWidth(), image.getHeight(), pixels);
        bitmap = new BinaryBitmap(new HybridBinarizer(source));
        result = reader.decode(bitmap);
        System.out.println(result.getText());
        //reader.reset();
    }
}
catch (Exception exception) {
    System.out.println(exception);
}